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Mirrors > Home > ILE Home > Th. List > a7s | GIF version |
Description: Swap quantifiers in an antecedent. (Contributed by NM, 5-Aug-1993.) |
Ref | Expression |
---|---|
a7s.1 | ⊢ (∀x∀yφ → ψ) |
Ref | Expression |
---|---|
a7s | ⊢ (∀y∀xφ → ψ) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ax-7 1334 | . 2 ⊢ (∀y∀xφ → ∀x∀yφ) | |
2 | a7s.1 | . 2 ⊢ (∀x∀yφ → ψ) | |
3 | 1, 2 | syl 14 | 1 ⊢ (∀y∀xφ → ψ) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∀wal 1240 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-7 1334 |
This theorem is referenced by: cbv2h 1631 hbsb4t 1886 mor 1939 |
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