| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 4577 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ 𝒫 (𝐴 ∪ 𝐵)) |
| 4 | 3 | elexd 2814 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∈ wcel 2200 Vcvv 2800 ∪ cun 3196 ifcif 3603 𝒫 cpw 3650 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pr 4297 ax-un 4528 |
| This theorem depends on definitions: df-bi 117 df-tru 1398 df-nf 1507 df-sb 1809 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-rex 2514 df-rab 2517 df-v 2802 df-un 3202 df-in 3204 df-ss 3211 df-if 3604 df-pw 3652 df-sn 3673 df-pr 3674 df-uni 3892 |
| This theorem is referenced by: ifexg 4580 ccatlen 11165 ccatvalfn 11171 ccatalpha 11183 swrdval 11222 pfxval 11248 fnpfx 11251 gsumfzval 13467 vtxvalg 15860 iedgvalg 15861 vtxex 15862 iedgex 15863 edgvalg 15903 |
| Copyright terms: Public domain | W3C validator |