Theorem ax12or 1443

Description: Another name for ax-i12 1438. (Contributed by NM, 3-Feb-2015.)

Assertion

Ref	Expression
ax12or	|- ( A. z z = x \/ ( A. z z = y \/ A. z ( x = y -> A. z x = y ) ) )

Proof of Theorem ax12or

Step	Hyp	Ref	Expression
1		ax-i12 1438	1 |- ( A. z z = x \/ ( A. z z = y \/ A. z ( x = y -> A. z x = y ) ) )

Syntax hints:   -> wi 4   \/ wo 661   A.wal 1282

This theorem was proved from axioms:  ax-i12 1438

This theorem is referenced by:  hbequid  1446  hbae  1646  equvini  1681  equveli  1682