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Theorem u2lemnoa 661
Description: Lemma for Dishkant implication study.
Assertion
Ref Expression
u2lemnoa ((a ->2 b)' v a) = ((a v b) ^ (a v b'))
Proof of Theorem u2lemnoa
StepHypRef Expression
1 u2lemana 606 . . . 4 ((a ->2 b) ^ a') = ((a' ^ b) v (a' ^ b'))
2 ax-a2 31 . . . . 5 ((a' ^ b) v (a' ^ b')) = ((a' ^ b') v (a' ^ b))
3 anor3 90 . . . . . 6 (a' ^ b') = (a v b)'
4 anor2 89 . . . . . 6 (a' ^ b) = (a v b')'
53, 42or 72 . . . . 5 ((a' ^ b') v (a' ^ b)) = ((a v b)' v (a v b')')
62, 5ax-r2 36 . . . 4 ((a' ^ b) v (a' ^ b')) = ((a v b)' v (a v b')')
71, 6ax-r2 36 . . 3 ((a ->2 b) ^ a') = ((a v b)' v (a v b')')
8 anor1 88 . . 3 ((a ->2 b) ^ a') = ((a ->2 b)' v a)'
9 oran3 93 . . 3 ((a v b)' v (a v b')') = ((a v b) ^ (a v b'))'
107, 8, 93tr2 64 . 2 ((a ->2 b)' v a)' = ((a v b) ^ (a v b'))'
1110con1 66 1 ((a ->2 b)' v a) = ((a v b) ^ (a v b'))
Colors of variables: term
Syntax hints:   = wb 1  'wn 4   v wo 6   ^ wa 7   ->2 wi2 13
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-i2 45  df-le1 130  df-le2 131  df-c1 132  df-c2 133
This theorem is referenced by: (None)
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