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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 4513 | . 2 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ 𝒫 (𝐴 ∪ 𝐵)) |
4 | 3 | elexd 2773 | 1 ⊢ (𝜑 → if(𝜓, 𝐴, 𝐵) ∈ V) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∈ wcel 2164 Vcvv 2760 ∪ cun 3151 ifcif 3557 𝒫 cpw 3601 |
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 710 ax-5 1458 ax-7 1459 ax-gen 1460 ax-ie1 1504 ax-ie2 1505 ax-8 1515 ax-10 1516 ax-11 1517 ax-i12 1518 ax-bndl 1520 ax-4 1521 ax-17 1537 ax-i9 1541 ax-ial 1545 ax-i5r 1546 ax-13 2166 ax-14 2167 ax-ext 2175 ax-sep 4147 ax-pr 4238 ax-un 4464 |
This theorem depends on definitions: df-bi 117 df-tru 1367 df-nf 1472 df-sb 1774 df-clab 2180 df-cleq 2186 df-clel 2189 df-nfc 2325 df-rex 2478 df-rab 2481 df-v 2762 df-un 3157 df-in 3159 df-ss 3166 df-if 3558 df-pw 3603 df-sn 3624 df-pr 3625 df-uni 3836 |
This theorem is referenced by: ifexg 4516 gsumfzval 12974 |
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