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Theorem dp35lem0 1177
Description: Part of proof (3)=>(5) in Day/Pickering 1982.
Hypotheses
Ref Expression
dp35lem.1 c0 = ((a1 v a2) ^ (b1 v b2))
dp35lem.2 c1 = ((a0 v a2) ^ (b0 v b2))
dp35lem.3 c2 = ((a0 v a1) ^ (b0 v b1))
dp35lem.4 p0 = ((a1 v b1) ^ (a2 v b2))
dp35lem.5 p = (((a0 v b0) ^ (a1 v b1)) ^ (a2 v b2))
Assertion
Ref Expression
dp35lem0 ((a0 v a1) ^ ((b0 ^ (a0 v p0)) v b1)) =< ((c0 v c1) v (b1 ^ (a0 v a1)))

Proof of Theorem dp35lem0
StepHypRef Expression
1 orcom 73 . . . . . 6 ((b0 ^ (a0 v p0)) v b1) = (b1 v (b0 ^ (a0 v p0)))
2 leid 148 . . . . . 6 (b1 v (b0 ^ (a0 v p0))) =< (b1 v (b0 ^ (a0 v p0)))
31, 2bltr 138 . . . . 5 ((b0 ^ (a0 v p0)) v b1) =< (b1 v (b0 ^ (a0 v p0)))
4 dp35lem.1 . . . . . 6 c0 = ((a1 v a2) ^ (b1 v b2))
5 dp35lem.2 . . . . . 6 c1 = ((a0 v a2) ^ (b0 v b2))
6 dp35lem.3 . . . . . 6 c2 = ((a0 v a1) ^ (b0 v b1))
7 dp35lem.4 . . . . . 6 p0 = ((a1 v b1) ^ (a2 v b2))
8 dp35lem.5 . . . . . 6 p = (((a0 v b0) ^ (a1 v b1)) ^ (a2 v b2))
94, 5, 6, 7, 8dp35lema 1176 . . . . 5 (b1 v (b0 ^ (a0 v p0))) =< (b1 v ((a0 v a1) ^ (c0 v c1)))
103, 9letr 137 . . . 4 ((b0 ^ (a0 v p0)) v b1) =< (b1 v ((a0 v a1) ^ (c0 v c1)))
1110lelan 167 . . 3 ((a0 v a1) ^ ((b0 ^ (a0 v p0)) v b1)) =< ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1))))
12 id 59 . . . . 5 ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1)))) = ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1))))
13 lea 160 . . . . . 6 ((a0 v a1) ^ (c0 v c1)) =< (a0 v a1)
1413mldual2i 1125 . . . . 5 ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1)))) = (((a0 v a1) ^ b1) v ((a0 v a1) ^ (c0 v c1)))
1512, 14tr 62 . . . 4 ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1)))) = (((a0 v a1) ^ b1) v ((a0 v a1) ^ (c0 v c1)))
16 ancom 74 . . . . 5 ((a0 v a1) ^ b1) = (b1 ^ (a0 v a1))
1716ror 71 . . . 4 (((a0 v a1) ^ b1) v ((a0 v a1) ^ (c0 v c1))) = ((b1 ^ (a0 v a1)) v ((a0 v a1) ^ (c0 v c1)))
1815, 17tr 62 . . 3 ((a0 v a1) ^ (b1 v ((a0 v a1) ^ (c0 v c1)))) = ((b1 ^ (a0 v a1)) v ((a0 v a1) ^ (c0 v c1)))
1911, 18lbtr 139 . 2 ((a0 v a1) ^ ((b0 ^ (a0 v p0)) v b1)) =< ((b1 ^ (a0 v a1)) v ((a0 v a1) ^ (c0 v c1)))
20 lear 161 . . . 4 ((a0 v a1) ^ (c0 v c1)) =< (c0 v c1)
2120lelor 166 . . 3 ((b1 ^ (a0 v a1)) v ((a0 v a1) ^ (c0 v c1))) =< ((b1 ^ (a0 v a1)) v (c0 v c1))
22 orcom 73 . . 3 ((b1 ^ (a0 v a1)) v (c0 v c1)) = ((c0 v c1) v (b1 ^ (a0 v a1)))
2321, 22lbtr 139 . 2 ((b1 ^ (a0 v a1)) v ((a0 v a1) ^ (c0 v c1))) =< ((c0 v c1) v (b1 ^ (a0 v a1)))
2419, 23letr 137 1 ((a0 v a1) ^ ((b0 ^ (a0 v p0)) v b1)) =< ((c0 v c1) 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-a4 33  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38  ax-ml 1120  ax-arg 1151
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:  dp35  1178  oadp35  1210
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