lean2/tests/lean/arith7.lean

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Eval | -2 |
(*
Unfortunately, we can't write |-2|, because |- is considered a single token.
It is not wise to change that since the symbol |- can be used as the notation for
entailment relation in Lean.
*)
Eval |3|
Definition x : Int := -3
Eval |x + 1|
Eval |x + 1| > 0
Variable y : Int
Eval |x + y|
Show |x + y| > x
SetOption pp::notation false
Show |x + y| > x
Show |x + y| + |y + x| > x