Axiom ax-4 1597

Description: Axiom of Quantified Implication. Axiom C4 of [Monk2] p. 105 and Theorem 19.20 of [Margaris] p. 90. It is restated as alim 1598 for labelling consistency. It should be used only by alim 1598. (Contributed by NM, 21-May-2008.) (New usage is discouraged.)

Assertion

Ref	Expression
ax-4

Detailed syntax breakdown of Axiom ax-4

Step	Hyp	Ref	Expression
1		wph	. . . 4
2		wps	. . . 4
3	1, 2	wi 4	. . 3
4		vx	. . 3
5	3, 4	wal 1580	. 2
6	1, 4	wal 1580	. . 3
7	2, 4	wal 1580	. . 3
8	6, 7	wi 4	. 2
9	5, 8	wi 4	1

This axiom is referenced by:  alim  1598