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Theorem oa6to4h2 956
 Description: Satisfaction of 6-variable OA law hypothesis. (Contributed by NM, 22-Dec-1998.)
Hypotheses
Ref Expression
oa6to4.1 b = (a1 g)
oa6to4.2 d = (c1 g)
oa6to4.3 f = (e1 g)
Assertion
Ref Expression
oa6to4h2 cd

Proof of Theorem oa6to4h2
StepHypRef Expression
1 leo 158 . 2 c ≤ (c ∪ (cg))
2 oa6to4.2 . . . . 5 d = (c1 g)
3 df-i1 44 . . . . . 6 (c1 g) = (c ∪ (cg))
43ax-r4 37 . . . . 5 (c1 g) = (c ∪ (cg))
52, 4ax-r2 36 . . . 4 d = (c ∪ (cg))
65ax-r1 35 . . 3 (c ∪ (cg)) = d
76con3 68 . 2 (c ∪ (cg)) = d
81, 7lbtr 139 1 cd
 Colors of variables: term Syntax hints:   = wb 1   ≤ wle 2  ⊥ wn 4   ∪ wo 6   ∩ wa 7   →1 wi1 12 This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38 This theorem depends on definitions:  df-a 40  df-i1 44  df-le1 130  df-le2 131 This theorem is referenced by: (None)
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