Theorem cm 61

Description: Commutative inference rule for ortholattices.

Hypothesis

Ref	Expression
cm.1	a = b

Assertion

Ref	Expression
cm	b = a

Proof of Theorem cm

Step	Hyp	Ref	Expression
1		cm.1	. 2 a = b
2	1	ax-r1 35	1 b = a

Syntax hints:   = wb 1

This theorem is referenced by:  k1-6 353  k1-7 354  k1-8a 355  k1-4 359

This theorem was proved from axioms:  ax-r1 35

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