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| Mirrors > Home > ILE Home > Th. List > abexssex | GIF version | ||
| Description: Existence of a class abstraction with an existentially quantified expression. Both 𝑥 and 𝑦 can be free in 𝜑. (Contributed by NM, 29-Jul-2006.) |
| Ref | Expression |
|---|---|
| abrexex2.1 | ⊢ 𝐴 ∈ V |
| abrexex2.2 | ⊢ {𝑦 ∣ 𝜑} ∈ V |
| Ref | Expression |
|---|---|
| abexssex | ⊢ {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} ∈ V |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rex 2490 | . . . 4 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑)) | |
| 2 | velpw 3623 | . . . . . 6 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
| 3 | 2 | anbi1i 458 | . . . . 5 ⊢ ((𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ (𝑥 ⊆ 𝐴 ∧ 𝜑)) |
| 4 | 3 | exbii 1628 | . . . 4 ⊢ (∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)) |
| 5 | 1, 4 | bitri 184 | . . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)) |
| 6 | 5 | abbii 2321 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} = {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} |
| 7 | abrexex2.1 | . . . 4 ⊢ 𝐴 ∈ V | |
| 8 | 7 | pwex 4228 | . . 3 ⊢ 𝒫 𝐴 ∈ V |
| 9 | abrexex2.2 | . . 3 ⊢ {𝑦 ∣ 𝜑} ∈ V | |
| 10 | 8, 9 | abrexex2 6211 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} ∈ V |
| 11 | 6, 10 | eqeltrri 2279 | 1 ⊢ {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} ∈ V |
| Colors of variables: wff set class |
| Syntax hints: ∧ wa 104 ∃wex 1515 ∈ wcel 2176 {cab 2191 ∃wrex 2485 Vcvv 2772 ⊆ wss 3166 𝒫 cpw 3616 |
| 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 1470 ax-7 1471 ax-gen 1472 ax-ie1 1516 ax-ie2 1517 ax-8 1527 ax-10 1528 ax-11 1529 ax-i12 1530 ax-bndl 1532 ax-4 1533 ax-17 1549 ax-i9 1553 ax-ial 1557 ax-i5r 1558 ax-13 2178 ax-14 2179 ax-ext 2187 ax-coll 4160 ax-sep 4163 ax-pow 4219 ax-pr 4254 ax-un 4481 |
| This theorem depends on definitions: df-bi 117 df-3an 983 df-tru 1376 df-nf 1484 df-sb 1786 df-eu 2057 df-mo 2058 df-clab 2192 df-cleq 2198 df-clel 2201 df-nfc 2337 df-ral 2489 df-rex 2490 df-reu 2491 df-rab 2493 df-v 2774 df-sbc 2999 df-csb 3094 df-un 3170 df-in 3172 df-ss 3179 df-pw 3618 df-sn 3639 df-pr 3640 df-op 3642 df-uni 3851 df-iun 3929 df-br 4046 df-opab 4107 df-mpt 4108 df-id 4341 df-xp 4682 df-rel 4683 df-cnv 4684 df-co 4685 df-dm 4686 df-rn 4687 df-res 4688 df-ima 4689 df-iota 5233 df-fun 5274 df-fn 5275 df-f 5276 df-f1 5277 df-fo 5278 df-f1o 5279 df-fv 5280 |
| This theorem is referenced by: (None) |
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