Theorem hba2 1562

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 1551	. 2 |- ( A. x ph -> A. x A. x ph )
2	1	hbal 1488	1 |- ( A. y A. x ph -> A. x A. y A. x ph )

Syntax hints:   -> wi 4   A.wal 1362

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-5 1458  ax-7 1459  ax-gen 1460  ax-ial 1545

This theorem is referenced by: (None)