e379034b95
- It uses the unifier in "conservative" mode - It only affects the current goal closes #570
17 lines
469 B
Text
17 lines
469 B
Text
import logic
|
||
open tactic
|
||
|
||
notation `(` h `|` r:(foldl `|` (e r, tactic.or_else r e) h) `)` := r
|
||
|
||
definition basic_tac : tactic
|
||
:= repeat (apply @and.intro | assumption)
|
||
|
||
set_begin_end_tactic basic_tac -- basic_tac is automatically applied to each element of a proof-qed block
|
||
|
||
theorem tst (a b : Prop) (H : ¬ a ∨ ¬ b) (Hb : b) : ¬ a ∧ b :=
|
||
begin
|
||
assume Ha, or.elim H
|
||
(assume Hna, @absurd _ false Ha Hna)
|
||
(assume Hnb, @absurd _ false Hb Hnb),
|
||
now
|
||
end
|