lean2/tests/lean/run/tactic22.lean

import standard
using tactic

theorem T (a b c d : Bool) (Ha : a) (Hb : b) (Hc : c) (Hd : d) : a ∧ b ∧ c ∧ d
:= by fixpoint (λ f, [apply @and_intro; f | assumption; f | id])
feat(library/tactic): add 'fixpoint' tactic Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2014-07-04 08:30:28 +00:00			`import standard`
			`using tactic`

			`theorem T (a b c d : Bool) (Ha : a) (Hb : b) (Hc : c) (Hd : d) : a ∧ b ∧ c ∧ d`
fix(library/standard): orelse notation, avoid conflict with inductive datatype declaration Signed-off-by: Leonardo de Moura <leonardo@microsoft.com> 2014-07-04 17:10:05 +00:00			`:= by fixpoint (λ f, [apply @and_intro; f \| assumption; f \| id])`