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Axiom ax-10o 1601
Description: Axiom ax-10o 1601 ("o" for "old") was the original version of ax-10 1393, before it was discovered (in May 2008) that the shorter ax-10 1393 could replace it. It appears as Axiom scheme C11' in [Megill] p. 448 (p. 16 of the preprint).

This axiom is redundant, as shown by theorem ax10o 1600.

Normally, ax10o 1600 should be used rather than ax-10o 1601, except by theorems specifically studying the latter's properties. (Contributed by NM, 5-Aug-1993.) (New usage is discouraged.)

Assertion
Ref Expression
ax-10o

Detailed syntax breakdown of Axiom ax-10o
StepHypRef Expression
1 vx . . . 4  setvar
2 vy . . . 4  setvar
31, 2weq 1389 . . 3
43, 1wal 1240 . 2
5 wph . . . 4
65, 1wal 1240 . . 3
75, 2wal 1240 . . 3
86, 7wi 4 . 2
94, 8wi 4 1
Colors of variables: wff set class
This axiom is referenced by:  ax10  1602
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