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Theorem u5lemnob 674
Description: Lemma for relevance implication study. (Contributed by NM, 16-Dec-1997.)
Assertion
Ref Expression
u5lemnob ((a5 b)b) = (ab)

Proof of Theorem u5lemnob
StepHypRef Expression
1 u5lemanb 619 . . 3 ((a5 b) ∩ b ) = (ab )
2 anor1 88 . . 3 ((a5 b) ∩ b ) = ((a5 b)b)
3 anor3 90 . . 3 (ab ) = (ab)
41, 2, 33tr2 64 . 2 ((a5 b)b) = (ab)
54con1 66 1 ((a5 b)b) = (ab)
Colors of variables: term
Syntax hints:   = wb 1   wn 4  wo 6  wa 7  5 wi5 16
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-i5 48  df-le1 130  df-le2 131  df-c1 132  df-c2 133
This theorem is referenced by: (None)
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