Theorem hba2 1539

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 1528	. 2 |- ( A. x ph -> A. x A. x ph )
2	1	hbal 1465	1 |- ( A. y A. x ph -> A. x A. y A. x ph )

Syntax hints:   -> wi 4   A.wal 1341

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-5 1435  ax-7 1436  ax-gen 1437  ax-ial 1522

This theorem is referenced by: (None)