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Theorem dp15lema 1152
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
dp15lema ((a0 v e) ^ (a1 v b1)) =< (d v b2)

Proof of Theorem dp15lema
StepHypRef Expression
1 dp15lema.3 . . . . 5 e = (b0 ^ (a0 v p0))
2 dp15lema.2 . . . . . . 7 p0 = ((a1 v b1) ^ (a2 v b2))
32lor 70 . . . . . 6 (a0 v p0) = (a0 v ((a1 v b1) ^ (a2 v b2)))
43lan 77 . . . . 5 (b0 ^ (a0 v p0)) = (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))
51, 4tr 62 . . . 4 e = (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))
65lor 70 . . 3 (a0 v e) = (a0 v (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2)))))
76ran 78 . 2 ((a0 v e) ^ (a1 v b1)) = ((a0 v (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1))
8 le1 146 . . . . . 6 b0 =< 1
98leran 153 . . . . 5 (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2)))) =< (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))
109lelor 166 . . . 4 (a0 v (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) =< (a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2)))))
1110leran 153 . . 3 ((a0 v (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) =< ((a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1))
12 an1r 107 . . . . . . . . 9 (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2)))) = (a0 v ((a1 v b1) ^ (a2 v b2)))
1312lor 70 . . . . . . . 8 (a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) = (a0 v (a0 v ((a1 v b1) ^ (a2 v b2))))
14 orass 75 . . . . . . . . 9 ((a0 v a0) v ((a1 v b1) ^ (a2 v b2))) = (a0 v (a0 v ((a1 v b1) ^ (a2 v b2))))
1514cm 61 . . . . . . . 8 (a0 v (a0 v ((a1 v b1) ^ (a2 v b2)))) = ((a0 v a0) v ((a1 v b1) ^ (a2 v b2)))
16 oridm 110 . . . . . . . . . 10 (a0 v a0) = a0
1716ror 71 . . . . . . . . 9 ((a0 v a0) v ((a1 v b1) ^ (a2 v b2))) = (a0 v ((a1 v b1) ^ (a2 v b2)))
18 orcom 73 . . . . . . . . 9 (a0 v ((a1 v b1) ^ (a2 v b2))) = (((a1 v b1) ^ (a2 v b2)) v a0)
1917, 18tr 62 . . . . . . . 8 ((a0 v a0) v ((a1 v b1) ^ (a2 v b2))) = (((a1 v b1) ^ (a2 v b2)) v a0)
2013, 15, 193tr 65 . . . . . . 7 (a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) = (((a1 v b1) ^ (a2 v b2)) v a0)
2120ran 78 . . . . . 6 ((a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) = ((((a1 v b1) ^ (a2 v b2)) v a0) ^ (a1 v b1))
22 lea 160 . . . . . . 7 ((a1 v b1) ^ (a2 v b2)) =< (a1 v b1)
2322mlduali 1126 . . . . . 6 ((((a1 v b1) ^ (a2 v b2)) v a0) ^ (a1 v b1)) = (((a1 v b1) ^ (a2 v b2)) v (a0 ^ (a1 v b1)))
2421, 23tr 62 . . . . 5 ((a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) = (((a1 v b1) ^ (a2 v b2)) v (a0 ^ (a1 v b1)))
25 lear 161 . . . . . 6 ((a1 v b1) ^ (a2 v b2)) =< (a2 v b2)
2625leror 152 . . . . 5 (((a1 v b1) ^ (a2 v b2)) v (a0 ^ (a1 v b1))) =< ((a2 v b2) v (a0 ^ (a1 v b1)))
2724, 26bltr 138 . . . 4 ((a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) =< ((a2 v b2) v (a0 ^ (a1 v b1)))
28 or32 82 . . . . 5 ((a2 v b2) v (a0 ^ (a1 v b1))) = ((a2 v (a0 ^ (a1 v b1))) v b2)
29 dp15lema.1 . . . . . . 7 d = (a2 v (a0 ^ (a1 v b1)))
3029ror 71 . . . . . 6 (d v b2) = ((a2 v (a0 ^ (a1 v b1))) v b2)
3130cm 61 . . . . 5 ((a2 v (a0 ^ (a1 v b1))) v b2) = (d v b2)
3228, 31tr 62 . . . 4 ((a2 v b2) v (a0 ^ (a1 v b1))) = (d v b2)
3327, 32lbtr 139 . . 3 ((a0 v (1 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) =< (d v b2)
3411, 33letr 137 . 2 ((a0 v (b0 ^ (a0 v ((a1 v b1) ^ (a2 v b2))))) ^ (a1 v b1)) =< (d v b2)
357, 34bltr 138 1 ((a0 v e) ^ (a1 v b1)) =< (d v b2)
Colors of variables: term
Syntax hints:   = wb 1   =< wle 2   v wo 6   ^ wa 7  1wt 8
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
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:  dp15lemb  1153
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