Theorem ax12or 1490

Description: Another name for ax-i12 1485. (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 1485	1 |- ( A. z z = x \/ ( A. z z = y \/ A. z ( x = y -> A. z x = y ) ) )

Syntax hints:   -> wi 4   \/ wo 697   A.wal 1329

This theorem was proved from axioms:  ax-i12 1485

This theorem is referenced by:  hbequid  1493  hbae  1696  equvini  1731  equveli  1732