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Theorem negantlem7 855
 Description: Negated antecedent identity. (Contributed by NM, 6-Aug-2001.)
Hypothesis
Ref Expression
negant.1 (a1 c) = (b1 c)
Assertion
Ref Expression
negantlem7 (ac) = (bc)

Proof of Theorem negantlem7
StepHypRef Expression
1 negant.1 . . . 4 (a1 c) = (b1 c)
21negantlem5 853 . . 3 (ac ) = (bc )
3 anor3 90 . . 3 (ac ) = (ac)
4 anor3 90 . . 3 (bc ) = (bc)
52, 3, 43tr2 64 . 2 (ac) = (bc)
65con1 66 1 (ac) = (bc)
 Colors of variables: term Syntax hints:   = wb 1  ⊥ wn 4   ∪ wo 6   ∩ wa 7   →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:  negant0  857
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