Theorem lem4.6.3le1 1081

Description: Equation 4.11 of [MegPav2000] p. 23. This is the first part of the equation. (Contributed by Roy F. Longton, 3-Jul-05.)

Assertion

Ref	Expression
lem4.6.3le1	(a⊥ →1 b)⊥ ≤ a⊥

Proof of Theorem lem4.6.3le1

Step	Hyp	Ref	Expression
1		u1lem9a 777	1 (a⊥ →1 b)⊥ ≤ a⊥

Syntax hints:   ≤ wle 2  ^⊥ wn 4   →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

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