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Mirrors > Home > ILE Home > Th. List > r19.21bi | GIF version |
Description: Inference from Theorem 19.21 of [Margaris] p. 90. (Restricted quantifier version.) (Contributed by NM, 20-Nov-1994.) |
Ref | Expression |
---|---|
r19.21bi.1 | ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝜓) |
Ref | Expression |
---|---|
r19.21bi | ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | r19.21bi.1 | . . . 4 ⊢ (𝜑 → ∀𝑥 ∈ 𝐴 𝜓) | |
2 | df-ral 2453 | . . . 4 ⊢ (∀𝑥 ∈ 𝐴 𝜓 ↔ ∀𝑥(𝑥 ∈ 𝐴 → 𝜓)) | |
3 | 1, 2 | sylib 121 | . . 3 ⊢ (𝜑 → ∀𝑥(𝑥 ∈ 𝐴 → 𝜓)) |
4 | 3 | 19.21bi 1551 | . 2 ⊢ (𝜑 → (𝑥 ∈ 𝐴 → 𝜓)) |
5 | 4 | imp 123 | 1 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐴) → 𝜓) |
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