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Theorem u4lemle1 713
Description: L.e. to non-tollens implication. (Contributed by NM, 11-Jan-1998.)
Hypothesis
Ref Expression
ulemle1.1 ab
Assertion
Ref Expression
u4lemle1 (a4 b) = 1

Proof of Theorem u4lemle1
StepHypRef Expression
1 ulemle1.1 . . . 4 ab
21lecom 180 . . 3 a C b
32u4lemc4 704 . 2 (a4 b) = (ab)
41sklem 230 . 2 (ab) = 1
53, 4ax-r2 36 1 (a4 b) = 1
Colors of variables: term
Syntax hints:   = wb 1  wle 2   wn 4  wo 6  1wt 8  4 wi4 15
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-i4 47  df-le1 130  df-le2 131  df-c1 132  df-c2 133
This theorem is referenced by: (None)
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