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Theorem 19.3 2202
Description: A wff may be quantified with a variable not free in it. Version of 19.9 2205 with a universal quantifier. Theorem 19.3 of [Margaris] p. 89. See 19.3v 1981 for a version requiring fewer axioms. (Contributed by NM, 12-Mar-1993.) (Revised by Mario Carneiro, 24-Sep-2016.)
Hypothesis
Ref Expression
19.3.1 𝑥𝜑
Assertion
Ref Expression
19.3 (∀𝑥𝜑𝜑)

Proof of Theorem 19.3
StepHypRef Expression
1 sp 2183 . 2 (∀𝑥𝜑𝜑)
2 19.3.1 . . 3 𝑥𝜑
32nf5ri 2195 . 2 (𝜑 → ∀𝑥𝜑)
41, 3impbii 209 1 (∀𝑥𝜑𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wal 1538  wnf 1783
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-12 2177
This theorem depends on definitions:  df-bi 207  df-ex 1780  df-nf 1784
This theorem is referenced by:  19.16  2225  19.17  2226  19.27  2227  19.28  2228  19.37  2232  aaan  2333  axrep4  5285  axrep4OLD  5286  zfcndrep  10654  bj-alexbiex  36700  bj-alalbial  36702  fvineqsneq  37413
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