lean2/tests/lean/show1.lean
Leonardo de Moura c50227ea6e feat(library/tactic): change apply tactic semantics: goals are not reversed; and dependent arguments are not included
This commit also adds the tactic rapply that corresponds to the previous
semantics we have been using.
2014-10-22 18:11:09 -07:00

14 lines
376 B
Text

import logic
open bool eq.ops tactic
constants a b c : bool
axiom H1 : a = b
axiom H2 : b = c
check show a = c, from H1 ⬝ H2
print "------------"
check have e1 [visible] : a = b, from H1,
have e2 : a = c, by apply eq.trans; apply e1; apply H2,
have e3 : c = a, from e2⁻¹,
have e4 [visible] : b = a, from e1⁻¹,
show b = c, from e1⁻¹ ⬝ e2