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| Mirrors > Home > ILE Home > Th. List > abexex | GIF version | ||
| Description: A condition where a class builder continues to exist after its wff is existentially quantified. (Contributed by NM, 4-Mar-2007.) |
| Ref | Expression |
|---|---|
| abexex.1 | ⊢ 𝐴 ∈ V |
| abexex.2 | ⊢ (𝜑 → 𝑥 ∈ 𝐴) |
| abexex.3 | ⊢ {𝑦 ∣ 𝜑} ∈ V |
| Ref | Expression |
|---|---|
| abexex | ⊢ {𝑦 ∣ ∃𝑥𝜑} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rex 2491 | . . . 4 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 2 | abexex.2 | . . . . . 6 ⊢ (𝜑 → 𝑥 ∈ 𝐴) | |
| 3 | 2 | pm4.71ri 392 | . . . . 5 ⊢ (𝜑 ↔ (𝑥 ∈ 𝐴 ∧ 𝜑)) |
| 4 | 3 | exbii 1629 | . . . 4 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) |
| 5 | 1, 4 | bitr4i 187 | . . 3 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥𝜑) |
| 6 | 5 | abbii 2322 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝜑} = {𝑦 ∣ ∃𝑥𝜑} |
| 7 | abexex.1 | . . 3 ⊢ 𝐴 ∈ V | |
| 8 | abexex.3 | . . 3 ⊢ {𝑦 ∣ 𝜑} ∈ V | |
| 9 | 7, 8 | abrexex2 6222 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝐴 𝜑} ∈ V |
| 10 | 6, 9 | eqeltrri 2280 | 1 ⊢ {𝑦 ∣ ∃𝑥𝜑} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∃wex 1516 ∈ wcel 2177 {cab 2192 ∃wrex 2486 Vcvv 2773 |
| 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-coll 4167 ax-sep 4170 ax-pow 4226 ax-pr 4261 ax-un 4488 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1485 df-sb 1787 df-eu 2058 df-mo 2059 df-clab 2193 df-cleq 2199 df-clel 2202 df-nfc 2338 df-ral 2490 df-rex 2491 df-reu 2492 df-rab 2494 df-v 2775 df-sbc 3003 df-csb 3098 df-un 3174 df-in 3176 df-ss 3183 df-pw 3623 df-sn 3644 df-pr 3645 df-op 3647 df-uni 3857 df-iun 3935 df-br 4052 df-opab 4114 df-mpt 4115 df-id 4348 df-xp 4689 df-rel 4690 df-cnv 4691 df-co 4692 df-dm 4693 df-rn 4694 df-res 4695 df-ima 4696 df-iota 5241 df-fun 5282 df-fn 5283 df-f 5284 df-f1 5285 df-fo 5286 df-f1o 5287 df-fv 5288 |
| This theorem is referenced by: (None) |
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