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| Mirrors > Home > ILE Home > Th. List > iotaexel | GIF version | ||
| Description: Set existence of an iota expression in which all values are contained within a set. (Contributed by Jim Kingdon, 28-Jun-2025.) |
| Ref | Expression |
|---|---|
| iotaexel | ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥(𝜑 → 𝑥 ∈ 𝐴)) → (℩𝑥𝜑) ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-riota 5912 | . . 3 ⊢ (℩𝑥 ∈ 𝐴 𝜑) = (℩𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 2 | pm4.71r 390 | . . . . . 6 ⊢ ((𝜑 → 𝑥 ∈ 𝐴) ↔ (𝜑 ↔ (𝑥 ∈ 𝐴 ∧ 𝜑))) | |
| 3 | 2 | albii 1494 | . . . . 5 ⊢ (∀𝑥(𝜑 → 𝑥 ∈ 𝐴) ↔ ∀𝑥(𝜑 ↔ (𝑥 ∈ 𝐴 ∧ 𝜑))) |
| 4 | iotabi 5250 | . . . . 5 ⊢ (∀𝑥(𝜑 ↔ (𝑥 ∈ 𝐴 ∧ 𝜑)) → (℩𝑥𝜑) = (℩𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) | |
| 5 | 3, 4 | sylbi 121 | . . . 4 ⊢ (∀𝑥(𝜑 → 𝑥 ∈ 𝐴) → (℩𝑥𝜑) = (℩𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) |
| 6 | 5 | adantl 277 | . . 3 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥(𝜑 → 𝑥 ∈ 𝐴)) → (℩𝑥𝜑) = (℩𝑥(𝑥 ∈ 𝐴 ∧ 𝜑))) |
| 7 | 1, 6 | eqtr4id 2258 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥(𝜑 → 𝑥 ∈ 𝐴)) → (℩𝑥 ∈ 𝐴 𝜑) = (℩𝑥𝜑)) |
| 8 | riotaexg 5916 | . . 3 ⊢ (𝐴 ∈ 𝑉 → (℩𝑥 ∈ 𝐴 𝜑) ∈ V) | |
| 9 | 8 | adantr 276 | . 2 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥(𝜑 → 𝑥 ∈ 𝐴)) → (℩𝑥 ∈ 𝐴 𝜑) ∈ V) |
| 10 | 7, 9 | eqeltrrd 2284 | 1 ⊢ ((𝐴 ∈ 𝑉 ∧ ∀𝑥(𝜑 → 𝑥 ∈ 𝐴)) → (℩𝑥𝜑) ∈ V) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 ∀wal 1371 = wceq 1373 ∈ wcel 2177 Vcvv 2773 ℩cio 5239 ℩crio 5911 |
| 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 711 ax-5 1471 ax-7 1472 ax-gen 1473 ax-ie1 1517 ax-ie2 1518 ax-8 1528 ax-10 1529 ax-11 1530 ax-i12 1531 ax-bndl 1533 ax-4 1534 ax-17 1550 ax-i9 1554 ax-ial 1558 ax-i5r 1559 ax-13 2179 ax-14 2180 ax-ext 2188 ax-sep 4170 ax-un 4488 |
| This theorem depends on definitions: df-bi 117 df-tru 1376 df-nf 1485 df-sb 1787 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-v 2775 df-un 3174 df-in 3176 df-ss 3183 df-pw 3623 df-sn 3644 df-pr 3645 df-uni 3857 df-iota 5241 df-riota 5912 |
| This theorem is referenced by: (None) |
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