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Related theorems GIF version |
| Description: Formula-building rule for restricted universal quantifier (deduction rule). |
| Ref | Expression |
|---|---|
| ralbidv.1 | ⊢ (φ → (ψ ↔ χ)) |
| Ref | Expression |
|---|---|
| ralbidv | ⊢ (φ → (∀x ∈ A ψ ↔ ∀x ∈ A χ)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-17 973 | . 2 ⊢ (φ → ∀xφ) | |
| 2 | ralbidv.1 | . 2 ⊢ (φ → (ψ ↔ χ)) | |
| 3 | 1, 2 | ralbid 1664 | 1 ⊢ (φ → (∀x ∈ A ψ ↔ ∀x ∈ A χ)) |