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| Mirrors > Home > ILE Home > Th. List > ifexd | GIF version | ||
| Description: Existence of a conditional class (deduction form). (Contributed by BJ, 15-Aug-2024.) |
| Ref | Expression |
|---|---|
| ifexd.1 | ⊢ (𝜑 → 𝐴 ∈ 𝑉) |
| ifexd.2 | ⊢ (𝜑 → 𝐵 ∈ 𝑊) |
| Ref | Expression |
|---|---|
| ifexd | ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ifexd.1 | . . 3 ⊢ (𝜑 → 𝐴 ∈ 𝑉) | |
| 2 | ifexd.2 | . . 3 ⊢ (𝜑 → 𝐵 ∈ 𝑊) | |
| 3 | 1, 2 | ifelpwund 4630 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ 𝒫 (𝐴 ∪ 𝐵)) |
| 4 | 3 | elexd 2835 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ∈ wcel 2209 Vcvv 2821 ∪ cun 3218 ifcif 3638 𝒫 cpw 3688 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-sep 4251 ax-pr 4348 ax-un 4580 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-rex 2534 df-rab 2537 df-v 2823 df-un 3224 df-in 3226 df-ss 3233 df-if 3639 df-pw 3690 df-sn 3715 df-pr 3716 df-uni 3936 |
| This theorem is used by: ifexg 4633 ccatlen 11386 ccatvalfn 11392 ccatalpha 11404 swrdval 11443 pfxval 11469 fnpfx 11472 gzsumfzval 13771 psrlidmfi 15204 psrridmfi 15205 mvrval2 15212 vtxvalg 16474 iedgvalg 16475 vtxex 16476 iedgex 16477 edgvalg 16517 |
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