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Mirrors > Home > MPE Home > Th. List > Mathboxes > vtoclefex | Structured version Visualization version GIF version |
Description: Implicit substitution of a class for a setvar variable. (Contributed by ML, 17-Oct-2020.) |
Ref | Expression |
---|---|
vtoclefex.1 | ⊢ Ⅎ𝑥𝜑 |
vtoclefex.3 | ⊢ (𝑥 = 𝐴 → 𝜑) |
Ref | Expression |
---|---|
vtoclefex | ⊢ (𝐴 ∈ 𝑉 → 𝜑) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vtoclefex.1 | . 2 ⊢ Ⅎ𝑥𝜑 | |
2 | vtoclefex.3 | . . 3 ⊢ (𝑥 = 𝐴 → 𝜑) | |
3 | 2 | ax-gen 1790 | . 2 ⊢ ∀𝑥(𝑥 = 𝐴 → 𝜑) |
4 | vtoclegft 3588 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ Ⅎ𝑥𝜑 ∧ ∀𝑥(𝑥 = 𝐴 → 𝜑)) → 𝜑) | |
5 | 1, 3, 4 | mp3an23 1451 | 1 ⊢ (𝐴 ∈ 𝑉 → 𝜑) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∀wal 1533 = wceq 1535 Ⅎwnf 1778 ∈ wcel 2104 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1963 ax-7 2003 ax-8 2106 ax-12 2173 |
This theorem depends on definitions: df-bi 207 df-an 396 df-3an 1087 df-tru 1538 df-ex 1775 df-nf 1779 df-sb 2061 df-clab 2711 df-clel 2812 |
This theorem is referenced by: finxpreclem2 37333 |
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