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Theorem ax12f 2270
Description: Basis step for constructing a substitution instance of ax-c15 2220 without using ax-c15 2220. We can start with any formula in which is not free. (Contributed by NM, 21-Jan-2007.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
ax12f.1
Assertion
Ref Expression
ax12f

Proof of Theorem ax12f
StepHypRef Expression
1 ax12f.1 . . 3
2 ax-1 6 . . 3
31, 2alrimih 1642 . 2
43a1ii 27 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  A.wal 1393
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-gen 1618  ax-4 1631
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