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Mirrors > Home > MPE Home > Th. List > Mathboxes > r19.36vf | Structured version Visualization version GIF version |
Description: Restricted quantifier version of one direction of 19.36 2228. (Contributed by Glauco Siliprandi, 23-Oct-2021.) |
Ref | Expression |
---|---|
r19.36vf.1 | ⊢ Ⅎ𝑥𝜓 |
Ref | Expression |
---|---|
r19.36vf | ⊢ (∃𝑥 ∈ 𝐴 (𝜑 → 𝜓) → (∀𝑥 ∈ 𝐴 𝜑 → 𝜓)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | r19.35 3341 | . 2 ⊢ (∃𝑥 ∈ 𝐴 (𝜑 → 𝜓) ↔ (∀𝑥 ∈ 𝐴 𝜑 → ∃𝑥 ∈ 𝐴 𝜓)) | |
2 | r19.36vf.1 | . . . 4 ⊢ Ⅎ𝑥𝜓 | |
3 | idd 24 | . . . 4 ⊢ (𝑥 ∈ 𝐴 → (𝜓 → 𝜓)) | |
4 | 2, 3 | rexlimi 3315 | . . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜓 → 𝜓) |
5 | 4 | imim2i 16 | . 2 ⊢ ((∀𝑥 ∈ 𝐴 𝜑 → ∃𝑥 ∈ 𝐴 𝜓) → (∀𝑥 ∈ 𝐴 𝜑 → 𝜓)) |
6 | 1, 5 | sylbi 219 | 1 ⊢ (∃𝑥 ∈ 𝐴 (𝜑 → 𝜓) → (∀𝑥 ∈ 𝐴 𝜑 → 𝜓)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 Ⅎwnf 1780 ∈ wcel 2110 ∀wral 3138 ∃wrex 3139 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-12 2173 |
This theorem depends on definitions: df-bi 209 df-an 399 df-ex 1777 df-nf 1781 df-ral 3143 df-rex 3144 |
This theorem is referenced by: iinssf 41400 |
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