Merge remote-tracking branch 'origin/master'

This commit is contained in:
Mysaa 2022-05-18 00:53:28 +02:00
commit 245133b276
Signed by: Mysaa
GPG Key ID: 7054D5D6A90F084F

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~~(((A -> B) -> A) -> A)
intro peirce.
cut ~~(A \/ ~A).
intro te.
apply te.
intro te2.
elim te2.
intro a.
cut ~A.
intro f.
apply f.
assumption.
intro a2.
apply peirce.
intro f.
assumption.
intro na.
apply peirce.
intro f.
apply f.
intro a.
cut False.
intro false.
elim false.
apply na.
assumption.
intro f.
cut ~A.
intro f2.
cut A \/ ~A.
assumption.
right.
assumption.
intro a.
cut A \/ ~A.
assumption.
left.
assumption.