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Theorem dp15lemf 1157
Description: Part of proof (1)=>(5) in Day/Pickering 1982.
Hypotheses
Ref Expression
dp15lema.1 d = (a2 v (a0 ^ (a1 v b1)))
dp15lema.2 p0 = ((a1 v b1) ^ (a2 v b2))
dp15lema.3 e = (b0 ^ (a0 v p0))
Assertion
Ref Expression
dp15lemf (((a0 v a2) ^ ((b0 ^ (a0 v p0)) v b2)) v (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2))) =< (((a1 v a2) ^ (b1 v b2)) v (((a0 v a2) ^ (b0 v b2)) v (b1 ^ (a0 v a1))))

Proof of Theorem dp15lemf
StepHypRef Expression
1 lea 160 . . . . 5 (b0 ^ (a0 v p0)) =< b0
21leror 152 . . . 4 ((b0 ^ (a0 v p0)) v b2) =< (b0 v b2)
32lelan 167 . . 3 ((a0 v a2) ^ ((b0 ^ (a0 v p0)) v b2)) =< ((a0 v a2) ^ (b0 v b2))
4 leao1 162 . . . . . 6 (b1 ^ (a0 v a1)) =< (b1 v b2)
54mldual2i 1125 . . . . 5 ((b1 v b2) ^ ((a1 v a2) v (b1 ^ (a0 v a1)))) = (((b1 v b2) ^ (a1 v a2)) v (b1 ^ (a0 v a1)))
6 ancom 74 . . . . 5 ((b1 v b2) ^ ((a1 v a2) v (b1 ^ (a0 v a1)))) = (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2))
7 ancom 74 . . . . . 6 ((b1 v b2) ^ (a1 v a2)) = ((a1 v a2) ^ (b1 v b2))
87ror 71 . . . . 5 (((b1 v b2) ^ (a1 v a2)) v (b1 ^ (a0 v a1))) = (((a1 v a2) ^ (b1 v b2)) v (b1 ^ (a0 v a1)))
95, 6, 83tr2 64 . . . 4 (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2)) = (((a1 v a2) ^ (b1 v b2)) v (b1 ^ (a0 v a1)))
109bile 142 . . 3 (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2)) =< (((a1 v a2) ^ (b1 v b2)) v (b1 ^ (a0 v a1)))
113, 10le2or 168 . 2 (((a0 v a2) ^ ((b0 ^ (a0 v p0)) v b2)) v (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2))) =< (((a0 v a2) ^ (b0 v b2)) v (((a1 v a2) ^ (b1 v b2)) v (b1 ^ (a0 v a1))))
12 or12 80 . 2 (((a0 v a2) ^ (b0 v b2)) v (((a1 v a2) ^ (b1 v b2)) v (b1 ^ (a0 v a1)))) = (((a1 v a2) ^ (b1 v b2)) v (((a0 v a2) ^ (b0 v b2)) v (b1 ^ (a0 v a1))))
1311, 12lbtr 139 1 (((a0 v a2) ^ ((b0 ^ (a0 v p0)) v b2)) v (((a1 v a2) v (b1 ^ (a0 v a1))) ^ (b1 v b2))) =< (((a1 v a2) ^ (b1 v b2)) v (((a0 v a2) ^ (b0 v b2)) v (b1 ^ (a0 v a1))))
Colors of variables: term
Syntax hints:   = wb 1   =< wle 2   v wo 6   ^ wa 7
This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a3 32  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38  ax-ml 1120
This theorem depends on definitions:  df-a 40  df-t 41  df-f 42  df-le1 130  df-le2 131
This theorem is referenced by:  dp15lemh  1159
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