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Theorem u1lem1 734
Description: Lemma for unified implication study.
Assertion
Ref Expression
u1lem1 ((a ->1 b) ->1 a) = a
Proof of Theorem u1lem1
StepHypRef Expression
1 u1lemc1 680 . . . 4 a C (a ->1 b)
21comcom 453 . . 3 (a ->1 b) C a
32u1lemc4 701 . 2 ((a ->1 b) ->1 a) = ((a ->1 b)' v a)
4 u1lemnoa 660 . 2 ((a ->1 b)' v a) = a
53, 4ax-r2 36 1 ((a ->1 b) ->1 a) = a
Colors of variables: term
Syntax hints:   = wb 1  'wn 4   v wo 6   ->1 wi1 12
This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a3 32  ax-a4 33  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38  ax-r3 439
This theorem depends on definitions:  df-b 39  df-a 40  df-t 41  df-f 42  df-i1 44  df-le1 130  df-le2 131  df-c1 132  df-c2 133
This theorem is referenced by:  u1lem1n  739  u1lem2  744
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