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Theorem wleror 393
Description: Add disjunct to right of both sides.
Hypothesis
Ref Expression
wle.1 (a =<2 b) = 1
Assertion
Ref Expression
wleror ((a v c) =<2 (b v c)) = 1
Proof of Theorem wleror
StepHypRef Expression
1 orordir 113 . . . . 5 ((a v b) v c) = ((a v c) v (b v c))
21bi1 118 . . . 4 (((a v b) v c) == ((a v c) v (b v c))) = 1
32wr1 197 . . 3 (((a v c) v (b v c)) == ((a v b) v c)) = 1
4 wle.1 . . . . 5 (a =<2 b) = 1
54wdf-le2 379 . . . 4 ((a v b) == b) = 1
65wr5-2v 366 . . 3 (((a v b) v c) == (b v c)) = 1
73, 6wr2 371 . 2 (((a v c) v (b v c)) == (b v c)) = 1
87wdf-le1 378 1 ((a v c) =<2 (b v c)) = 1
Colors of variables: term
Syntax hints:   = wb 1   v wo 6  1wt 8   =<2 wle2 10
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-wom 361
This theorem depends on definitions:  df-b 39  df-a 40  df-t 41  df-f 42  df-i1 44  df-i2 45  df-le 129  df-le1 130  df-le2 131
This theorem is referenced by:  wle2or  403
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