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Theorem hbth 1349
Description: No variable is (effectively) free in a theorem.

This and later "hypothesis-building" lemmas, with labels starting "hb...", allow us to construct proofs of formulas of the form from smaller formulas of this form. These are useful for constructing hypotheses that state " is (effectively) not free in ." (Contributed by NM, 5-Aug-1993.)

Ref Expression
Ref Expression

Proof of Theorem hbth
StepHypRef Expression
1 hbth.1 . . 3
21ax-gen 1335 . 2
32a1i 9 1
Colors of variables: wff set class
Syntax hints:   wi 4  wal 1240
This theorem was proved from axioms:  ax-1 5  ax-mp 7  ax-gen 1335
This theorem is referenced by:  nfth  1350  sbieh  1670  bj-sbimeh  9247
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