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Theorem 2ax17 1850
Description: Quantification of two variables over a formula in which they do not occur. (Contributed by Alan Sare, 12-Apr-2011.)
Ref Expression
2ax17 (𝜑 → ∀𝑥𝑦𝜑)
Distinct variable groups:   𝜑,𝑥   𝜑,𝑦

Proof of Theorem 2ax17
StepHypRef Expression
1 id 19 . 2 (𝜑𝜑)
21alrimivv 1847 1 (𝜑 → ∀𝑥𝑦𝜑)
Colors of variables: wff set class
Syntax hints:  wi 4  wal 1329
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-5 1423  ax-gen 1425  ax-17 1506
This theorem is referenced by: (None)
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