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Theorem a5i 1476
Description: Inference generalizing a consequent. (Contributed by NM, 5-Aug-1993.)
Hypothesis
Ref Expression
a5i.1 (∀𝑥𝜑𝜓)
Assertion
Ref Expression
a5i (∀𝑥𝜑 → ∀𝑥𝜓)

Proof of Theorem a5i
StepHypRef Expression
1 hba1 1474 . . 3 (∀𝑥𝜑 → ∀𝑥𝑥𝜑)
2 ax-5 1377 . . 3 (∀𝑥(∀𝑥𝜑𝜓) → (∀𝑥𝑥𝜑 → ∀𝑥𝜓))
31, 2syl5 32 . 2 (∀𝑥(∀𝑥𝜑𝜓) → (∀𝑥𝜑 → ∀𝑥𝜓))
4 a5i.1 . 2 (∀𝑥𝜑𝜓)
53, 4mpg 1381 1 (∀𝑥𝜑 → ∀𝑥𝜓)
Colors of variables: wff set class
Syntax hints:  wi 4  wal 1283
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-5 1377  ax-gen 1379  ax-ial 1468
This theorem is referenced by:  hbae  1647  equveli  1683  hbsb2a  1728  hbsb2e  1729  aev  1734  dveeq2or  1738  hbsb2  1758  nfsb2or  1759  reu6  2782
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