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Mirrors > Home > ILE Home > Th. List > vtocl2gf | GIF version |
Description: Implicit substitution of a class for a setvar variable. (Contributed by NM, 25-Apr-1995.) |
Ref | Expression |
---|---|
vtocl2gf.1 | ⊢ Ⅎ𝑥𝐴 |
vtocl2gf.2 | ⊢ Ⅎ𝑦𝐴 |
vtocl2gf.3 | ⊢ Ⅎ𝑦𝐵 |
vtocl2gf.4 | ⊢ Ⅎ𝑥𝜓 |
vtocl2gf.5 | ⊢ Ⅎ𝑦𝜒 |
vtocl2gf.6 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
vtocl2gf.7 | ⊢ (𝑦 = 𝐵 → (𝜓 ↔ 𝜒)) |
vtocl2gf.8 | ⊢ 𝜑 |
Ref | Expression |
---|---|
vtocl2gf | ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝜒) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | elex 2732 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ∈ V) | |
2 | vtocl2gf.3 | . . 3 ⊢ Ⅎ𝑦𝐵 | |
3 | vtocl2gf.2 | . . . . 5 ⊢ Ⅎ𝑦𝐴 | |
4 | 3 | nfel1 2317 | . . . 4 ⊢ Ⅎ𝑦 𝐴 ∈ V |
5 | vtocl2gf.5 | . . . 4 ⊢ Ⅎ𝑦𝜒 | |
6 | 4, 5 | nfim 1559 | . . 3 ⊢ Ⅎ𝑦(𝐴 ∈ V → 𝜒) |
7 | vtocl2gf.7 | . . . 4 ⊢ (𝑦 = 𝐵 → (𝜓 ↔ 𝜒)) | |
8 | 7 | imbi2d 229 | . . 3 ⊢ (𝑦 = 𝐵 → ((𝐴 ∈ V → 𝜓) ↔ (𝐴 ∈ V → 𝜒))) |
9 | vtocl2gf.1 | . . . 4 ⊢ Ⅎ𝑥𝐴 | |
10 | vtocl2gf.4 | . . . 4 ⊢ Ⅎ𝑥𝜓 | |
11 | vtocl2gf.6 | . . . 4 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
12 | vtocl2gf.8 | . . . 4 ⊢ 𝜑 | |
13 | 9, 10, 11, 12 | vtoclgf 2779 | . . 3 ⊢ (𝐴 ∈ V → 𝜓) |
14 | 2, 6, 8, 13 | vtoclgf 2779 | . 2 ⊢ (𝐵 ∈ 𝑊 → (𝐴 ∈ V → 𝜒)) |
15 | 1, 14 | mpan9 279 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ 𝐵 ∈ 𝑊) → 𝜒) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 ↔ wb 104 = wceq 1342 Ⅎwnf 1447 ∈ wcel 2135 Ⅎwnfc 2293 Vcvv 2721 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1434 ax-7 1435 ax-gen 1436 ax-ie1 1480 ax-ie2 1481 ax-8 1491 ax-10 1492 ax-11 1493 ax-i12 1494 ax-bndl 1496 ax-4 1497 ax-17 1513 ax-i9 1517 ax-ial 1521 ax-i5r 1522 ax-ext 2146 |
This theorem depends on definitions: df-bi 116 df-tru 1345 df-nf 1448 df-sb 1750 df-clab 2151 df-cleq 2157 df-clel 2160 df-nfc 2295 df-v 2723 |
This theorem is referenced by: vtocl3gf 2784 vtocl2g 2785 vtocl2gaf 2788 |
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