8 lines
No EOL
193 B
Text
8 lines
No EOL
193 B
Text
Theorem T (a b : Bool) : a \/ b => (not b) => a := _.
|
|
apply imp_tac
|
|
apply imp_tac
|
|
apply disj_hyp_tac
|
|
apply assumption_tac
|
|
apply absurd_tac
|
|
done
|
|
Show Environment 1. |