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Theorem naecoms 1609
Description: A commutation rule for distinct variable specifiers. (Contributed by NM, 2-Jan-2002.)
Hypothesis
Ref Expression
naecoms.1
Assertion
Ref Expression
naecoms

Proof of Theorem naecoms
StepHypRef Expression
1 ax-10 1393 . . 3
21con3i 561 . 2
3 naecoms.1 . 2
42, 3syl 14 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4  wal 1240   wceq 1242
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-in1 544  ax-in2 545  ax-10 1393
This theorem is referenced by:  nfcvf2  2197
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