Theorem u2lem1n 722

Description: Lemma for unified implication study.

Assertion

Ref	Expression
u2lem1n	((a →2 b) →2 a)⊥ = a⊥

Proof of Theorem u2lem1n

Step	Hyp	Ref	Expression
1		u2lem1 717	. 2 ((a →2 b) →2 a) = a
2	1	ax-r4 36	1 ((a →2 b) →2 a)⊥ = a⊥

Syntax hints:   = wb 1  ^⊥ wn 4   →₂ wi2 14

This theorem is referenced by:  u2lem2 727

This theorem was proved from axioms:  ax-a1 29  ax-a2 30  ax-a3 31  ax-a5 33  ax-r1 34  ax-r2 35  ax-r4 36  ax-r5 37

This theorem depends on definitions:  df-a 39  df-t 40  df-f 41  df-i2 44

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