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Mirrors > Home > MPE Home > Th. List > vtocl2 | Structured version Visualization version GIF version |
Description: Implicit substitution of classes for setvar variables. (Contributed by NM, 26-Jul-1995.) (Proof shortened by Andrew Salmon, 8-Jun-2011.) |
Ref | Expression |
---|---|
vtocl2.1 | ⊢ 𝐴 ∈ V |
vtocl2.2 | ⊢ 𝐵 ∈ V |
vtocl2.3 | ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) |
vtocl2.4 | ⊢ 𝜑 |
Ref | Expression |
---|---|
vtocl2 | ⊢ 𝜓 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | vtocl2.2 | . 2 ⊢ 𝐵 ∈ V | |
2 | vtocl2.4 | . . . 4 ⊢ 𝜑 | |
3 | 2 | a1i 11 | . . 3 ⊢ (𝑦 = 𝐵 → 𝜑) |
4 | vtocl2.1 | . . . 4 ⊢ 𝐴 ∈ V | |
5 | vtocl2.3 | . . . . 5 ⊢ ((𝑥 = 𝐴 ∧ 𝑦 = 𝐵) → (𝜑 ↔ 𝜓)) | |
6 | 5 | pm5.74da 803 | . . . 4 ⊢ (𝑥 = 𝐴 → ((𝑦 = 𝐵 → 𝜑) ↔ (𝑦 = 𝐵 → 𝜓))) |
7 | 4, 6, 3 | vtocl 3520 | . . 3 ⊢ (𝑦 = 𝐵 → 𝜓) |
8 | 3, 7 | 2thd 265 | . 2 ⊢ (𝑦 = 𝐵 → (𝜑 ↔ 𝜓)) |
9 | 1, 8, 2 | vtocl 3520 | 1 ⊢ 𝜓 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 Vcvv 3447 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 |
This theorem depends on definitions: df-bi 206 df-an 398 df-ex 1783 df-clel 2811 |
This theorem is referenced by: vtocl3 3523 caovord 7569 sornom 10221 wloglei 11695 ipodrsima 18438 mpfind 21540 mclsppslem 34241 monotoddzzfi 41313 |
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