diff --git a/src/frontends/lean/builtin_cmds.cpp b/src/frontends/lean/builtin_cmds.cpp
index c92d60c62..a0c6986cf 100644
--- a/src/frontends/lean/builtin_cmds.cpp
+++ b/src/frontends/lean/builtin_cmds.cpp
@@ -59,7 +59,10 @@ environment print_cmd(parser & p) {
     } else if (p.curr_is_token_or_id(get_raw_tk())) {
         p.next();
         expr e = p.parse_expr();
-        p.regular_stream() << e << endl;
+        io_state_stream out = p.regular_stream();
+        options opts = out.get_options();
+        opts = opts.update(get_pp_notation_option_name(), false);
+        out.update_options(opts) << e << endl;
     } else if (p.curr_is_token_or_id(get_options_tk())) {
         p.next();
         p.regular_stream() << p.ios().get_options() << endl;
diff --git a/src/frontends/lean/pp.cpp b/src/frontends/lean/pp.cpp
index dbe65a8e0..da70bc8f5 100644
--- a/src/frontends/lean/pp.cpp
+++ b/src/frontends/lean/pp.cpp
@@ -4,6 +4,7 @@ Released under Apache 2.0 license as described in the file LICENSE.
 
 Author: Leonardo de Moura
 */
+#include <algorithm>
 #include "util/flet.h"
 #include "kernel/replace_fn.h"
 #include "kernel/free_vars.h"
@@ -25,6 +26,7 @@ Author: Leonardo de Moura
 #include "frontends/lean/pp_options.h"
 #include "frontends/lean/token_table.h"
 #include "frontends/lean/builtin_exprs.h"
+#include "frontends/lean/parser_config.h"
 
 namespace lean {
 static format * g_ellipsis_n_fmt  = nullptr;
@@ -211,11 +213,11 @@ auto pretty_fn::pp_coercion_fn(expr const & e, unsigned sz) -> result {
     } else {
         expr const & fn = app_fn(e);
         result res_fn   = pp_coercion_fn(fn, sz-1);
-        format fn_fmt   = res_fn.first;
+        format fn_fmt   = res_fn.fmt();
         if (m_implict && sz == 2 && has_implicit_args(fn))
             fn_fmt = compose(*g_explicit_fmt, fn_fmt);
         result res_arg  = pp_child(app_arg(e), max_bp());
-        return mk_result(group(compose(fn_fmt, nest(m_indent, compose(line(), res_arg.first)))), max_bp()-1);
+        return result(max_bp()-1, group(compose(fn_fmt, nest(m_indent, compose(line(), res_arg.fmt())))));
     }
 }
 
@@ -232,8 +234,8 @@ auto pretty_fn::pp_coercion(expr const & e, unsigned bp) -> result {
         unsigned sz = args.size() - r->second;
         lean_assert(sz >= 2);
         auto r = pp_coercion_fn(e, sz);
-        if (r.second < bp) {
-            return mk_result(paren(r.first));
+        if (r.rbp() < bp) {
+            return result(paren(r.fmt()));
         } else {
             return r;
         }
@@ -242,8 +244,8 @@ auto pretty_fn::pp_coercion(expr const & e, unsigned bp) -> result {
 
 auto pretty_fn::pp_child_core(expr const & e, unsigned bp) -> result {
     result r = pp(e);
-    if (r.second < bp) {
-        return mk_result(paren(r.first));
+    if (r.rbp() < bp) {
+        return result(paren(r.fmt()));
     } else {
         return r;
     }
@@ -261,16 +263,16 @@ auto pretty_fn::pp_child(expr const & e, unsigned bp) -> result {
 
 auto pretty_fn::pp_var(expr const & e) -> result {
     unsigned vidx = var_idx(e);
-    return mk_result(compose(format("#"), format(vidx)));
+    return result(compose(format("#"), format(vidx)));
 }
 
 auto pretty_fn::pp_sort(expr const & e) -> result {
     if (m_env.impredicative() && e == mk_Prop()) {
-        return mk_result(format("Prop"));
+        return result(format("Prop"));
     } else if (m_universes) {
-        return mk_result(group(format("Type.{") + nest(6, pp_level(sort_level(e))) + format("}")));
+        return result(group(format("Type.{") + nest(6, pp_level(sort_level(e))) + format("}")));
     } else {
-        return mk_result(format("Type"));
+        return result(format("Type"));
     }
 }
 
@@ -322,18 +324,18 @@ auto pretty_fn::pp_const(expr const & e) -> result {
             first = false;
         }
         r += format("}");
-        return mk_result(group(r));
+        return result(group(r));
     } else {
-        return mk_result(format(n));
+        return result(format(n));
     }
 }
 
 auto pretty_fn::pp_meta(expr const & e) -> result {
-    return mk_result(compose(format("?"), format(mlocal_name(e))));
+    return result(compose(format("?"), format(mlocal_name(e))));
 }
 
 auto pretty_fn::pp_local(expr const & e) -> result {
-    return mk_result(format(local_pp_name(e)));
+    return result(format(local_pp_name(e)));
 }
 
 bool pretty_fn::has_implicit_args(expr const & f) {
@@ -360,11 +362,11 @@ bool pretty_fn::has_implicit_args(expr const & f) {
 auto pretty_fn::pp_app(expr const & e) -> result {
     expr const & fn = app_fn(e);
     result res_fn = pp_child(fn, max_bp()-1);
-    format fn_fmt = res_fn.first;
+    format fn_fmt = res_fn.fmt();
     if (m_implict && !is_app(fn) && has_implicit_args(fn))
         fn_fmt = compose(*g_explicit_fmt, fn_fmt);
     result res_arg = pp_child(app_arg(e), max_bp());
-    return mk_result(group(compose(fn_fmt, nest(m_indent, compose(line(), res_arg.first)))), max_bp()-1);
+    return result(max_bp()-1, group(compose(fn_fmt, nest(m_indent, compose(line(), res_arg.fmt())))));
 }
 
 format pretty_fn::pp_binder_block(buffer<name> const & names, expr const & type, binder_info const & bi) {
@@ -378,7 +380,7 @@ format pretty_fn::pp_binder_block(buffer<name> const & names, expr const & type,
         r += format(n);
         r += space();
     }
-    r += compose(colon(), nest(m_indent, compose(line(), pp_child(type, 0).first)));
+    r += compose(colon(), nest(m_indent, compose(line(), pp_child(type, 0).fmt())));
     if (bi.is_implicit()) r += format("}");
     else if (bi.is_inst_implicit()) r += format("]");
     else if (bi.is_strict_implicit() && m_unicode) r += format("⦄");
@@ -421,8 +423,8 @@ auto pretty_fn::pp_lambda(expr const & e) -> result {
     }
     format r = m_unicode ? *g_lambda_n_fmt : *g_lambda_fmt;
     r += pp_binders(locals);
-    r += compose(comma(), nest(m_indent, compose(line(), pp_child(b, 0).first)));
-    return mk_result(r, 0);
+    r += compose(comma(), nest(m_indent, compose(line(), pp_child(b, 0).fmt())));
+    return result(0, r);
 }
 
 /** \brief Similar to #is_arrow, but only returns true if binder_info is the default one.
@@ -436,8 +438,8 @@ auto pretty_fn::pp_pi(expr const & e) -> result {
     if (is_default_arrow(e)) {
         result lhs = pp_child(binding_domain(e), get_arrow_prec());
         result rhs = pp_child(lift_free_vars(binding_body(e), 1), get_arrow_prec()-1);
-        format r   = group(lhs.first + space() + (m_unicode ? *g_arrow_n_fmt : *g_arrow_fmt) + line() + rhs.first);
-        return mk_result(r, get_arrow_prec()-1);
+        format r   = group(lhs.fmt() + space() + (m_unicode ? *g_arrow_n_fmt : *g_arrow_fmt) + line() + rhs.fmt());
+        return result(get_arrow_prec()-1, r);
     } else {
         expr b = e;
         buffer<expr> locals;
@@ -452,8 +454,8 @@ auto pretty_fn::pp_pi(expr const & e) -> result {
         else
             r = m_unicode ? *g_pi_n_fmt : *g_pi_fmt;
         r += pp_binders(locals);
-        r += compose(comma(), nest(m_indent, compose(line(), pp_child(b, 0).first)));
-        return mk_result(r, 0);
+        r += compose(comma(), nest(m_indent, compose(line(), pp_child(b, 0).fmt())));
+        return result(0, r);
     }
 }
 
@@ -470,9 +472,9 @@ auto pretty_fn::pp_have(expr const & e) -> result {
     expr local   = p.second;
     expr body    = p.first;
     name const & n = local_pp_name(local);
-    format type_fmt  = pp_child(mlocal_type(local), 0).first;
-    format proof_fmt = pp_child(proof, 0).first;
-    format body_fmt  = pp_child(body, 0).first;
+    format type_fmt  = pp_child(mlocal_type(local), 0).fmt();
+    format proof_fmt = pp_child(proof, 0).fmt();
+    format body_fmt  = pp_child(body, 0).fmt();
     format r = *g_have_fmt + space() + format(n) + space();
     if (binding_info(binding).is_contextual())
         r += compose(*g_visible_fmt, space());
@@ -481,7 +483,7 @@ auto pretty_fn::pp_have(expr const & e) -> result {
     r += nest(m_indent, line() + proof_fmt + comma());
     r = group(r);
     r += line() + body_fmt;
-    return mk_result(r, 0);
+    return result(0, r);
 }
 
 auto pretty_fn::pp_show(expr const & e) -> result {
@@ -489,17 +491,17 @@ auto pretty_fn::pp_show(expr const & e) -> result {
     expr s           = get_annotation_arg(e);
     expr proof       = app_arg(s);
     expr type        = binding_domain(app_fn(s));
-    format type_fmt  = pp_child(type, 0).first;
-    format proof_fmt = pp_child(proof, 0).first;
+    format type_fmt  = pp_child(type, 0).fmt();
+    format proof_fmt = pp_child(proof, 0).fmt();
     format r = *g_show_fmt + space() + nest(5, type_fmt) + comma() + space() + *g_from_fmt;
     r = group(r);
     r += nest(m_indent, compose(line(), proof_fmt));
-    return mk_result(group(r), 0);
+    return result(0, group(r));
 }
 
 auto pretty_fn::pp_explicit(expr const & e) -> result {
     result res_arg = pp_child(get_explicit_arg(e), max_bp());
-    return mk_result(compose(*g_explicit_fmt, res_arg.first), max_bp());
+    return result(max_bp(), compose(*g_explicit_fmt, res_arg.fmt()));
 }
 
 auto pretty_fn::pp_macro(expr const & e) -> result {
@@ -510,9 +512,9 @@ auto pretty_fn::pp_macro(expr const & e) -> result {
         // fix macro<->pp interface
         format r = compose(format("["), format(macro_def(e).get_name()));
         for (unsigned i = 0; i < macro_num_args(e); i++)
-            r += nest(m_indent, compose(line(), pp_child(macro_arg(e, i), max_bp()).first));
+            r += nest(m_indent, compose(line(), pp_child(macro_arg(e, i), max_bp()).fmt()));
         r += format("]");
-        return mk_result(group(r));
+        return result(group(r));
     }
 }
 
@@ -544,26 +546,221 @@ auto pretty_fn::pp_let(expr e) -> result {
         format beg     = i == 0 ? space() : line();
         format sep     = i < sz - 1 ? comma() : format();
         format entry   = format(n);
-        format v_fmt   = pp_child(v, 0).first;
+        format v_fmt   = pp_child(v, 0).fmt();
         entry += space() + *g_assign_fmt + nest(m_indent, line() + v_fmt + sep);
         r += nest(3 + 1, beg + group(entry));
     }
-    format b = pp_child(e, 0).first;
+    format b = pp_child(e, 0).fmt();
     r += line() + *g_in_fmt + space() + nest(2 + 1, b);
-    return mk_result(r, 0);
+    return result(0, r);
 }
 
 auto pretty_fn::pp_num(mpz const & n) -> result {
-    return mk_result(format(n));
+    return result(format(n));
+}
+
+bool pretty_fn::match(level const & p, level const & l) {
+    if (p == l)
+        return true;
+    if (m_universes)
+        return false;
+    if (is_placeholder(p))
+        return true;
+    if (is_succ(p) && is_succ(l))
+        return match(succ_of(p), succ_of(l));
+    return false;
+}
+
+bool pretty_fn::match(expr const & p, expr const & e, buffer<optional<expr>> & args) {
+    if (is_explicit(p)) {
+        return match(get_explicit_arg(p), e, args);
+    } else if (is_var(p)) {
+        unsigned vidx = var_idx(p);
+        if (vidx >= args.size()) args.resize(vidx+1);
+        if (args[vidx])
+            return *args[vidx] == e;
+        args[vidx] = e;
+        return true;
+    } else if (is_placeholder(p)) {
+        return true;
+    } else if (is_constant(p)) {
+        if (!is_constant(e))
+            return false;
+        levels p_ls = const_levels(p);
+        levels e_ls = const_levels(p);
+        while (!is_nil(p_ls)) {
+            if (is_nil(e_ls))
+                return false; // e must have at least as many arguments as p
+            if (!match(head(p_ls), head(e_ls)))
+                return false;
+            p_ls = tail(p_ls);
+            e_ls = tail(e_ls);
+        }
+        return true;
+    } else if (is_sort(p)) {
+        if (!is_sort(e))
+            return false;
+        return match(sort_level(p), sort_level(e));
+    } else if (is_app(e)) {
+        buffer<expr> p_args, e_args;
+        expr const & p_fn = get_app_args(p, p_args);
+        expr const & e_fn = get_app_args(e, e_args);
+        if (!match(p_fn, e_fn, args))
+            return false;
+        bool expl   = is_explicit(p);
+        if (expl) {
+            if (p_args.size() != e_args.size())
+                return false;
+            for (unsigned i = 0; i < p_args.size(); i++) {
+                if (!match(p_args[i], e_args[i], args))
+                    return false;
+            }
+            return true;
+        } else {
+            try {
+                expr fn_type = m_tc.infer(e_fn).first;
+                unsigned j = 0;
+                for (unsigned i = 0; i < e_args.size(); i++) {
+                    fn_type = m_tc.ensure_pi(fn_type).first;
+                    if (is_explicit(binding_info(fn_type))) {
+                        if (j >= p_args.size())
+                            return false;
+                        if (!match(p_args[j], e_args[i], args))
+                            return false;
+                        j++;
+                    }
+                    fn_type = instantiate(binding_body(fn_type), e_args[i]);
+                }
+                return j == p_args.size();
+            } catch (exception&) {
+                return false;
+            }
+        }
+    } else {
+        return false;
+    }
+}
+
+static unsigned get_some_precedence(token_table const & t, name const & tk) {
+    if (tk.is_atomic() && tk.is_string()) {
+        if (auto p = get_precedence(t, tk.get_string()))
+            return *p;
+    } else {
+        if (auto p = get_precedence(t, tk.to_string().c_str()))
+            return *p;
+    }
+    return 0;
+}
+
+auto pretty_fn::pp_notation_child(expr const & e, unsigned lbp, unsigned rbp) -> result {
+    if (is_app(e) && !m_coercion && is_coercion(m_env, get_app_fn(e))) {
+        return pp_coercion(e, rbp);
+    } else {
+        result r = pp(e);
+        // std::cout << "e:   " << e << "\n";
+        // std::cout << "lbp: " << lbp << ", rbp: " << rbp << ", r.lbp(): " << r.lbp() << ", r.rbp(): " << r.rbp() << "\n\n";
+        if (r.rbp() < lbp || r.lbp() <= rbp) {
+            return result(paren(r.fmt()));
+        } else {
+            return r;
+        }
+    }
+}
+
+auto pretty_fn::pp_notation(notation_entry const & entry, buffer<optional<expr>> & args) -> optional<result> {
+    std::reverse(args.begin(), args.end());
+    if (entry.is_numeral()) {
+        return some(result(format(entry.get_num())));
+    } else {
+        using notation::transition;
+        buffer<transition> ts;
+        to_buffer(entry.get_transitions(), ts);
+        format fmt;
+        unsigned i         = ts.size();
+        unsigned last_rbp  = max_bp()-1;
+        unsigned token_lbp = 0;
+        bool last  = true;
+        while (i > 0) {
+            --i;
+            format curr;
+            notation::action const & a = ts[i].get_action();
+            name const & tk = ts[i].get_token();
+            switch (a.kind()) {
+            case notation::action_kind::Skip:
+                curr = format(tk);
+                if (last)
+                    last_rbp = get_some_precedence(m_token_table, tk);
+                break;
+            case notation::action_kind::Expr:
+                if (args.empty() || !args.back()) {
+                    return optional<result>();
+                } else {
+                    expr e = *args.back();
+                    args.pop_back();
+                    result e_r   = pp_notation_child(e, token_lbp, a.rbp());
+                    format e_fmt = e_r.fmt();
+                    curr = format(tk) + space() + e_fmt;
+                    if (last)
+                        last_rbp = a.rbp();
+                }
+                break;
+            case notation::action_kind::Exprs:
+            case notation::action_kind::Binder:
+            case notation::action_kind::Binders:
+            case notation::action_kind::ScopedExpr:
+                // TODO(Leo)
+                return optional<result>();
+            case notation::action_kind::Ext:
+            case notation::action_kind::LuaExt:
+                return optional<result>();
+            }
+            token_lbp = get_some_precedence(m_token_table, tk);
+            if (last) {
+                fmt = curr;
+                last = false;
+            } else {
+                fmt = curr + space() + fmt;
+            }
+        }
+        unsigned first_lbp = token_lbp;
+        if (!entry.is_nud()) {
+            lean_assert(!last);
+            if (args.size() != 1 || !args.back())
+                return optional<result>();
+            expr e = *args.back();
+            args.pop_back();
+            format e_fmt = pp_notation_child(e, token_lbp, 0).fmt();
+            fmt = e_fmt + space() + fmt;
+        }
+        return optional<result>(result(first_lbp, last_rbp, fmt));
+    }
+}
+
+auto pretty_fn::pp_notation(expr const & e) -> optional<result> {
+    if (!m_notation || is_var(e))
+        return optional<result>();
+    for (notation_entry const & entry : get_notation_entries(m_env, head_index(e))) {
+        if (!m_unicode && !entry.is_safe_ascii())
+            continue; // ignore this notation declaration since unicode support is not enabled
+        buffer<optional<expr>> args;
+        if (match(entry.get_expr(), e, args)) {
+            if (auto r = pp_notation(entry, args))
+                return r;
+        }
+    }
+    return optional<result>();
 }
 
 auto pretty_fn::pp(expr const & e) -> result {
     if (m_depth > m_max_depth || m_num_steps > m_max_steps)
-        return mk_result(m_unicode ? *g_ellipsis_n_fmt : *g_ellipsis_fmt);
+        return result(m_unicode ? *g_ellipsis_n_fmt : *g_ellipsis_fmt);
     flet<unsigned> let_d(m_depth, m_depth+1);
     m_num_steps++;
 
-    if (is_placeholder(e))  return mk_result(*g_placeholder_fmt);
+    if (auto r = pp_notation(e))
+        return *r;
+
+    if (is_placeholder(e))  return result(*g_placeholder_fmt);
     if (is_show(e))         return pp_show(e);
     if (is_have(e))         return pp_have(e);
     if (is_let(e))          return pp_let(e);
@@ -588,7 +785,7 @@ auto pretty_fn::pp(expr const & e) -> result {
 }
 
 pretty_fn::pretty_fn(environment const & env, options const & o):
-    m_env(env), m_tc(env) {
+    m_env(env), m_tc(env), m_token_table(get_token_table(env)) {
     set_options_core(o);
     m_meta_prefix   = "M";
     m_next_meta_idx = 1;
@@ -597,9 +794,9 @@ pretty_fn::pretty_fn(environment const & env, options const & o):
 format pretty_fn::operator()(expr const & e) {
     m_depth = 0; m_num_steps = 0;
     if (m_beta)
-        return pp_child(purify(beta_reduce(e)), 0).first;
+        return pp_child(purify(beta_reduce(e)), 0).fmt();
     else
-        return pp_child(purify(e), 0).first;
+        return pp_child(purify(e), 0).fmt();
 }
 
 formatter_factory mk_pretty_formatter_factory() {
diff --git a/src/frontends/lean/pp.h b/src/frontends/lean/pp.h
index 7da3d9d59..d48bf9831 100644
--- a/src/frontends/lean/pp.h
+++ b/src/frontends/lean/pp.h
@@ -14,43 +14,57 @@ Author: Leonardo de Moura
 #include "util/sexpr/format.h"
 #include "kernel/environment.h"
 #include "kernel/type_checker.h"
+#include "frontends/lean/token_table.h"
 
 namespace lean {
+class notation_entry;
+
 class pretty_fn {
 public:
-    typedef pair<format, unsigned> result;
+    static unsigned max_bp() { return std::numeric_limits<unsigned>::max(); }
+    class result {
+        unsigned m_lbp;
+        unsigned m_rbp;
+        format   m_fmt;
+    public:
+        result():m_lbp(max_bp()), m_rbp(max_bp()) {}
+        result(format const & fmt):m_lbp(max_bp()), m_rbp(max_bp()), m_fmt(fmt) {}
+        result(unsigned rbp, format const & fmt):m_lbp(max_bp()), m_rbp(rbp), m_fmt(fmt) {}
+        result(unsigned lbp, unsigned rbp, format const & fmt):m_lbp(lbp), m_rbp(rbp), m_fmt(fmt) {}
+        unsigned lbp() const { return m_lbp; }
+        unsigned rbp() const { return m_rbp; }
+        format const & fmt() const { return m_fmt; }
+    };
 private:
-    environment        m_env;
-    type_checker       m_tc;
-    unsigned           m_num_steps;
-    unsigned           m_depth;
-    name               m_meta_prefix;
-    unsigned           m_next_meta_idx;
-    name_map<name>     m_purify_meta_table;
-    name_map<name>     m_purify_local_table;
-    name_set           m_purify_used_locals;
+    environment         m_env;
+    type_checker        m_tc;
+    token_table const & m_token_table;
+    unsigned            m_num_steps;
+    unsigned            m_depth;
+    name                m_meta_prefix;
+    unsigned            m_next_meta_idx;
+    name_map<name>      m_purify_meta_table;
+    name_map<name>      m_purify_local_table;
+    name_set            m_purify_used_locals;
     // cached configuration
-    options            m_options;
-    unsigned           m_indent;
-    unsigned           m_max_depth;
-    unsigned           m_max_steps;
-    bool               m_implict;          //!< if true show implicit arguments
-    bool               m_unicode;          //!< if true use unicode chars
-    bool               m_coercion;         //!< if true show coercions
-    bool               m_notation;
-    bool               m_universes;
-    bool               m_full_names;
-    bool               m_private_names;
-    bool               m_metavar_args;
-    bool               m_beta;
+    options             m_options;
+    unsigned            m_indent;
+    unsigned            m_max_depth;
+    unsigned            m_max_steps;
+    bool                m_implict;          //!< if true show implicit arguments
+    bool                m_unicode;          //!< if true use unicode chars
+    bool                m_coercion;         //!< if true show coercions
+    bool                m_notation;
+    bool                m_universes;
+    bool                m_full_names;
+    bool                m_private_names;
+    bool                m_metavar_args;
+    bool                m_beta;
 
-    unsigned max_bp() const { return std::numeric_limits<unsigned>::max(); }
     name mk_metavar_name(name const & m);
     name mk_local_name(name const & n, name const & suggested);
     level purify(level const & l);
     expr purify(expr const & e);
-    result mk_result(format const & e, unsigned rbp) const { return mk_pair(e, rbp); }
-    result mk_result(format const & e) const { return mk_result(e, max_bp()); }
     bool is_implicit(expr const & f);
     bool is_prop(expr const & e);
     bool has_implicit_args(expr const & f);
@@ -60,6 +74,12 @@ private:
     format pp_binders(buffer<expr> const & locals);
     format pp_level(level const & l);
 
+    bool match(level const & p, level const & l);
+    bool match(expr const & p, expr const & e, buffer<optional<expr>> & args);
+    result pp_notation_child(expr const & e, unsigned lbp, unsigned rbp);
+    optional<result> pp_notation(notation_entry const & entry, buffer<optional<expr>> & args);
+    optional<result> pp_notation(expr const & e);
+
     result pp_coercion_fn(expr const & e, unsigned sz);
     result pp_coercion(expr const & e, unsigned bp);
     result pp_child_core(expr const & e, unsigned bp);
diff --git a/src/frontends/lean/pp_options.cpp b/src/frontends/lean/pp_options.cpp
index 80217a064..a4c0a8dcf 100644
--- a/src/frontends/lean/pp_options.cpp
+++ b/src/frontends/lean/pp_options.cpp
@@ -120,6 +120,7 @@ void finalize_pp_options() {
 name const & get_pp_coercions_option_name() { return *g_pp_coercions; }
 name const & get_pp_full_names_option_name() { return *g_pp_full_names; }
 name const & get_pp_universes_option_name() { return *g_pp_universes; }
+name const & get_pp_notation_option_name() { return *g_pp_notation; }
 
 unsigned get_pp_max_depth(options const & opts)     { return opts.get_unsigned(*g_pp_max_depth, LEAN_DEFAULT_PP_MAX_DEPTH); }
 unsigned get_pp_max_steps(options const & opts)     { return opts.get_unsigned(*g_pp_max_steps, LEAN_DEFAULT_PP_MAX_STEPS); }
diff --git a/src/frontends/lean/pp_options.h b/src/frontends/lean/pp_options.h
index 47de14641..f60718721 100644
--- a/src/frontends/lean/pp_options.h
+++ b/src/frontends/lean/pp_options.h
@@ -10,6 +10,7 @@ namespace lean {
 name const & get_pp_coercions_option_name();
 name const & get_pp_full_names_option_name();
 name const & get_pp_universes_option_name();
+name const & get_pp_notation_option_name();
 
 unsigned get_pp_max_depth(options const & opts);
 unsigned get_pp_max_steps(options const & opts);
diff --git a/tests/lean/bug1.lean.expected.out b/tests/lean/bug1.lean.expected.out
index 34a891e26..778e130ba 100644
--- a/tests/lean/bug1.lean.expected.out
+++ b/tests/lean/bug1.lean.expected.out
@@ -9,11 +9,11 @@ bug1.lean:13:7: error: type mismatch at definition 'and_intro', has type
     p → q → (∀ (c : bool), (p → q → c) → c)
 but is expected to have type
   ∀ (p q : bool),
-    p → q → and p p
+    p → q → p ∧ p
 bug1.lean:17:7: error: type mismatch at definition 'and_intro', has type
   ∀ (p q : bool),
     p → q → (∀ (c : bool), (p → q → c) → c)
 but is expected to have type
   ∀ (p q : bool),
-    p → q → and q p
-and_intro : ∀ (p q : bool), p → q → and p q
+    p → q → q ∧ p
+and_intro : ∀ (p q : bool), p → q → p ∧ q
diff --git a/tests/lean/calc1.lean.expected.out b/tests/lean/calc1.lean.expected.out
index e18623b03..3788f01bf 100644
--- a/tests/lean/calc1.lean.expected.out
+++ b/tests/lean/calc1.lean.expected.out
@@ -1,4 +1,4 @@
-le_eq_trans a d e (le_trans a c d (eq_le_trans a b c H1 H2) H3) H4 : le a e
+le_eq_trans a d e (le_trans a c d (eq_le_trans a b c H1 H2) H3) H4 : a ≤ e
 calc1.lean:38:10: error: invalid 'calc' expression, transitivity rule is not defined for current step
-le_lt_trans b c d H2 H5 : lt b d
+le_lt_trans b c d H2 H5 : b < d
 [choice (@le2_trans b d e (@le2_trans b c d H2 H3) H4) (@le_trans b d e (@le_trans b c d H2 H3) H4)]
diff --git a/tests/lean/crash.lean.expected.out b/tests/lean/crash.lean.expected.out
index 401a3e86c..7e21fe986 100644
--- a/tests/lean/crash.lean.expected.out
+++ b/tests/lean/crash.lean.expected.out
@@ -1,9 +1,9 @@
 crash.lean:8:12: error: type mismatch at application
-  have H' : not P, from H,
+  have H' : ¬ P, from H,
   ?M_1
 term
   H
 has type
   P
 but is expected to have type
-  not P
+  ¬ P
diff --git a/tests/lean/have1.lean.expected.out b/tests/lean/have1.lean.expected.out
index 4bb73aac7..37dd9aa36 100644
--- a/tests/lean/have1.lean.expected.out
+++ b/tests/lean/have1.lean.expected.out
@@ -1,9 +1,8 @@
-have e1 [visible] : eq a b, from H1,
-have e2 : eq a c, from trans e1 H2,
-have e3 : eq c a, from symm e2,
-have e4 [visible] : eq b a, from symm e1,
-have e5 : eq b c, from trans e4 e2,
-have e6 : eq a a, from
-  trans H1 (trans H2 (trans (symm H2) (trans (symm H1) (trans H1 (trans H2 (trans (symm H2) (symm H1))))))),
-trans e3 e2 :
-  eq c c
+have e1 [visible] : a = b, from H1,
+have e2 : a = c, from e1 ⬝ H2,
+have e3 : c = a, from e2 ⁻¹,
+have e4 [visible] : b = a, from e1 ⁻¹,
+have e5 : b = c, from e4 ⬝ e2,
+have e6 : a = a, from H1 ⬝ H2 ⬝ H2 ⁻¹ ⬝ H1 ⁻¹ ⬝ H1 ⬝ H2 ⬝ H2 ⁻¹ ⬝ H1 ⁻¹,
+e3 ⬝ e2 :
+  c = c
diff --git a/tests/lean/interactive/coe.input.expected.out b/tests/lean/interactive/coe.input.expected.out
index 90c3026cc..23514d74c 100644
--- a/tests/lean/interactive/coe.input.expected.out
+++ b/tests/lean/interactive/coe.input.expected.out
@@ -2,7 +2,7 @@
 -- ENDWAIT
 -- BEGININFO
 -- TYPE|5|16
-decidable (eq a b)
+decidable (a = b)
 -- ACK
 -- SYNTH|5|16
 int.has_decidable_eq a b
diff --git a/tests/lean/interactive/findp.input.expected.out b/tests/lean/interactive/findp.input.expected.out
index 58d75f863..69a75a3cd 100644
--- a/tests/lean/interactive/findp.input.expected.out
+++ b/tests/lean/interactive/findp.input.expected.out
@@ -4,8 +4,8 @@
 false|Prop
 false.rec|∀ (C : Prop), false → C
 false_elim|false → ?c
-not_false_trivial|not false
-true_ne_false|not (eq true false)
-p_ne_false|?p → ne ?p false
-eq_false_elim|eq ?a false → not ?a
+not_false_trivial|¬ false
+true_ne_false|¬ true = false
+p_ne_false|?p → ?p ≠ false
+eq_false_elim|?a = false → ¬ ?a
 -- ENDFINDP
diff --git a/tests/lean/interactive/in4.input.expected.out b/tests/lean/interactive/in4.input.expected.out
index ae09779f3..914131697 100644
--- a/tests/lean/interactive/in4.input.expected.out
+++ b/tests/lean/interactive/in4.input.expected.out
@@ -2,7 +2,7 @@
 -- ENDWAIT
 -- BEGININFO
 -- TYPE|9|0
-eq (tst.foo a b) (tst.foo a b)
+tst.foo a b = tst.foo a b
 -- ACK
 -- IDENTIFIER|9|0
 rfl
@@ -17,7 +17,7 @@ rfl
 -- ENDWAIT
 -- BEGININFO
 -- TYPE|9|0
-eq (tst.foo a b) (tst.foo a b)
+tst.foo a b = tst.foo a b
 -- ACK
 -- IDENTIFIER|9|0
 rfl
diff --git a/tests/lean/interactive/in5.input.expected.out b/tests/lean/interactive/in5.input.expected.out
index 548b8df39..2f11a9c76 100644
--- a/tests/lean/interactive/in5.input.expected.out
+++ b/tests/lean/interactive/in5.input.expected.out
@@ -2,7 +2,7 @@
 -- ENDWAIT
 -- BEGININFO
 -- TYPE|4|0
-A → B → and A B
+A → B → A ∧ B
 -- ACK
 -- IDENTIFIER|4|0
 and.intro
diff --git a/tests/lean/interactive/t4.input.expected.out b/tests/lean/interactive/t4.input.expected.out
index 99e8c4f46..b4de992dc 100644
--- a/tests/lean/interactive/t4.input.expected.out
+++ b/tests/lean/interactive/t4.input.expected.out
@@ -2,7 +2,7 @@
 -- ENDWAIT
 -- BEGININFO
 -- TYPE|6|6
-(nat → Prop) → nat
+(ℕ → Prop) → ℕ
 -- ACK
 -- IDENTIFIER|6|6
 epsilon
@@ -17,7 +17,7 @@ epsilon
 x
 -- ACK
 -- TYPE|6|21
-Type
+Type₁
 -- ACK
 -- IDENTIFIER|6|21
 nat
diff --git a/tests/lean/notation.lean b/tests/lean/notation.lean
new file mode 100644
index 000000000..4db3d71cd
--- /dev/null
+++ b/tests/lean/notation.lean
@@ -0,0 +1,18 @@
+import logic data.nat.basic
+open num
+constant b : num
+check b + b + b
+check true ∧ false ∧ true
+check (true ∧ false) ∧ true
+check 2 + (2 + 2)
+check (2 + 2) + 2
+check 1 = (2 + 3)*2
+check 2 + 3 * 2 = 3 * 2 + 2
+check (true ∨ false) = (true ∨ false) ∧ true
+check true ∧ (false ∨ true)
+constant A : Type₁
+constant a : A
+notation 1 := a
+check a
+open nat
+check ℕ → ℕ
diff --git a/tests/lean/notation.lean.expected.out b/tests/lean/notation.lean.expected.out
new file mode 100644
index 000000000..81c54d25b
--- /dev/null
+++ b/tests/lean/notation.lean.expected.out
@@ -0,0 +1,11 @@
+b + b + b : num
+true ∧ false ∧ true : Prop
+(true ∧ false) ∧ true : Prop
+2 + (2 + 2) : num
+2 + 2 + 2 : num
+1 = (2 + 3) * 2 : Prop
+2 + 3 * 2 = 3 * 2 + 2 : Prop
+(true ∨ false) = (true ∨ false) ∧ true : Prop
+true ∧ (false ∨ true) : Prop
+1 : A
+ℕ → ℕ : Type₁
diff --git a/tests/lean/show1.lean.expected.out b/tests/lean/show1.lean.expected.out
index 415259862..4653b8060 100644
--- a/tests/lean/show1.lean.expected.out
+++ b/tests/lean/show1.lean.expected.out
@@ -1,8 +1,8 @@
-show eq a c, from eq.trans H1 H2 : eq a c
+show a = c, from H1 ⬝ H2 : a = c
 ------------
-have e1 [visible] : eq a b, from H1,
-have e2 : eq a c, from eq.trans e1 H2,
-have e3 : eq c a, from eq.symm e2,
-have e4 [visible] : eq b a, from eq.symm e1,
-show eq b c, from eq.trans (eq.symm e1) e2 :
-  eq b c
+have e1 [visible] : a = b, from H1,
+have e2 : a = c, from e1 ⬝ H2,
+have e3 : c = a, from e2 ⁻¹,
+have e4 [visible] : b = a, from e1 ⁻¹,
+show b = c, from e1 ⁻¹ ⬝ e2 :
+  b = c
diff --git a/tests/lean/t10.lean.expected.out b/tests/lean/t10.lean.expected.out
index 844082b21..53bd0c09b 100644
--- a/tests/lean/t10.lean.expected.out
+++ b/tests/lean/t10.lean.expected.out
@@ -1,6 +1,6 @@
-ite (and p q) (f x) y : N
+if p ∧ q then f x else y : N
 t10.lean:14:6: error: type mismatch at application
-  ite (and p q) q
+  ite (p ∧ q) q
 term
   q
 has type
@@ -9,4 +9,4 @@ but is expected to have type
   N
 cons x (cons y (cons z (cons x (cons y (cons y nil))))) : list
 cons x nil : list
-nil : list
+[ ] : list
diff --git a/tests/lean/t14.lean.expected.out b/tests/lean/t14.lean.expected.out
index 7d7753c38..0af9971a3 100644
--- a/tests/lean/t14.lean.expected.out
+++ b/tests/lean/t14.lean.expected.out
@@ -8,8 +8,8 @@ t14.lean:23:26: error: invalid 'open/export' command option, mixing explicit and
 a : A
 c : A
 A : Type
-f a c : A
-foo.f foo.a foo.c : foo.A
+a * c : A
+foo.a * foo.c : foo.A
 t14.lean:46:8: error: unknown identifier 'a'
 f a c : A
 t14.lean:52:9: error: unexpected token
diff --git a/tests/lean/t9.lean.expected.out b/tests/lean/t9.lean.expected.out
index e02d98ed3..82c3ec2fb 100644
--- a/tests/lean/t9.lean.expected.out
+++ b/tests/lean/t9.lean.expected.out
@@ -1,3 +1,3 @@
-add a (mul b a) : N
+a + b * a : N
 t9.lean:16:7: error: invalid expression
-add a (mul b a) : N
+a + b * a : N
diff --git a/tests/lean/tuple.lean.expected.out b/tests/lean/tuple.lean.expected.out
index f14f0011e..f598af3c4 100644
--- a/tests/lean/tuple.lean.expected.out
+++ b/tests/lean/tuple.lean.expected.out
@@ -1 +1 @@
-tuple.{l_1} : Type.{max 1 l_1} → nat → Type.{max 1 l_1}
+tuple.{l_1} : Type.{max 1 l_1} → ℕ → Type.{max 1 l_1}
diff --git a/tests/lean/uni_bug1.lean.expected.out b/tests/lean/uni_bug1.lean.expected.out
index 9cadb966b..ce4339851 100644
--- a/tests/lean/uni_bug1.lean.expected.out
+++ b/tests/lean/uni_bug1.lean.expected.out
@@ -1 +1 @@
-f 1 0 (Rtrue (pr1 (pair 1 0)) 0) : nat
+f 1 0 (Rtrue (pr₁ (pair 1 0)) 0) : ℕ
diff --git a/tests/lean/univ.lean.expected.out b/tests/lean/univ.lean.expected.out
index ba9e87446..73483468e 100644
--- a/tests/lean/univ.lean.expected.out
+++ b/tests/lean/univ.lean.expected.out
@@ -1,13 +1,13 @@
 univ.lean:5:9: error: solution computed by the elaborator forces a universe placeholder to be a fixed value, computed sort is
-  Type.{1}
+  Type₁
 univ.lean:7:9: error: solution computed by the elaborator forces a universe placeholder to be a fixed value, computed sort is
-  Type.{1}
-id Type num : Type
-id Type num : Type
+  Type₁
+id Type₁ num : Type₁
+id Type₁ num : Type₁
 univ.lean:13:9: error: solution computed by the elaborator forces a universe placeholder to be a fixed value, computed sort is
-  Type.{1}
-id Type num : Type
+  Type₁
+id Type₁ num : Type₁
 univ.lean:17:9: error: solution computed by the elaborator forces a universe placeholder to be a fixed value, computed sort is
-  Type.{2}
+  Type₂
 univ.lean:19:9: error: solution computed by the elaborator forces a universe placeholder to be a fixed value, computed sort is
-  Type.{2}
+  Type₂
diff --git a/tests/lean/var2.lean.expected.out b/tests/lean/var2.lean.expected.out
index 6ce049e99..743a819dc 100644
--- a/tests/lean/var2.lean.expected.out
+++ b/tests/lean/var2.lean.expected.out
@@ -1 +1 @@
-foo : Π (B : Type), B → (Π (A : Type), A → eq A B → Prop)
+foo : Π (B : Type), B → (Π (A : Type), A → A = B → Prop)