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Theorem 19.3 1443
Description: A wff may be quantified with a variable not free in it. Theorem 19.3 of [Margaris] p. 89. (Contributed by NM, 5-Aug-1993.) (Revised by Mario Carneiro, 24-Sep-2016.)
Hypothesis
Ref Expression
19.3.1  F/
Assertion
Ref Expression
19.3

Proof of Theorem 19.3
StepHypRef Expression
1 sp 1398 . 2
2 19.3.1 . . 3  F/
32nfri 1409 . 2
41, 3impbii 117 1
Colors of variables: wff set class
Syntax hints:   wb 98  wal 1240   F/wnf 1346
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-4 1397
This theorem depends on definitions:  df-bi 110  df-nf 1347
This theorem is referenced by:  19.16  1444  19.17  1445  19.27  1450  19.28  1452  19.37-1  1561  rexxfrd  4161
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