Theorem hba2 1483

Description: Lemma 24 of [Monk2] p. 114. (Contributed by NM, 29-May-2008.)

Assertion

Ref	Expression
hba2	|- ( A. y A. x ph -> A. x A. y A. x ph )

Proof of Theorem hba2

Step	Hyp	Ref	Expression
1		hba1 1473	. 2 |- ( A. x ph -> A. x A. x ph )
2	1	hbal 1406	1 |- ( A. y A. x ph -> A. x A. y A. x ph )

Syntax hints:   -> wi 4   A.wal 1282

This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-5 1376  ax-7 1377  ax-gen 1378  ax-ial 1467

This theorem is referenced by: (None)