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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 2454 | . . . 4 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑)) | |
2 | velpw 3573 | . . . . . 6 ⊢ (𝑥 ∈ 𝒫 𝐴 ↔ 𝑥 ⊆ 𝐴) | |
3 | 2 | anbi1i 455 | . . . . 5 ⊢ ((𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ (𝑥 ⊆ 𝐴 ∧ 𝜑)) |
4 | 3 | exbii 1598 | . . . 4 ⊢ (∃𝑥(𝑥 ∈ 𝒫 𝐴 ∧ 𝜑) ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)) |
5 | 1, 4 | bitri 183 | . . 3 ⊢ (∃𝑥 ∈ 𝒫 𝐴𝜑 ↔ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)) |
6 | 5 | abbii 2286 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} = {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} |
7 | abrexex2.1 | . . . 4 ⊢ 𝐴 ∈ V | |
8 | 7 | pwex 4169 | . . 3 ⊢ 𝒫 𝐴 ∈ V |
9 | abrexex2.2 | . . 3 ⊢ {𝑦 ∣ 𝜑} ∈ V | |
10 | 8, 9 | abrexex2 6103 | . 2 ⊢ {𝑦 ∣ ∃𝑥 ∈ 𝒫 𝐴𝜑} ∈ V |
11 | 6, 10 | eqeltrri 2244 | 1 ⊢ {𝑦 ∣ ∃𝑥(𝑥 ⊆ 𝐴 ∧ 𝜑)} ∈ V |
Colors of variables: wff set class |
Syntax hints: ∧ wa 103 ∃wex 1485 ∈ wcel 2141 {cab 2156 ∃wrex 2449 Vcvv 2730 ⊆ wss 3121 𝒫 cpw 3566 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 704 ax-5 1440 ax-7 1441 ax-gen 1442 ax-ie1 1486 ax-ie2 1487 ax-8 1497 ax-10 1498 ax-11 1499 ax-i12 1500 ax-bndl 1502 ax-4 1503 ax-17 1519 ax-i9 1523 ax-ial 1527 ax-i5r 1528 ax-13 2143 ax-14 2144 ax-ext 2152 ax-coll 4104 ax-sep 4107 ax-pow 4160 ax-pr 4194 ax-un 4418 |
This theorem depends on definitions: df-bi 116 df-3an 975 df-tru 1351 df-nf 1454 df-sb 1756 df-eu 2022 df-mo 2023 df-clab 2157 df-cleq 2163 df-clel 2166 df-nfc 2301 df-ral 2453 df-rex 2454 df-reu 2455 df-rab 2457 df-v 2732 df-sbc 2956 df-csb 3050 df-un 3125 df-in 3127 df-ss 3134 df-pw 3568 df-sn 3589 df-pr 3590 df-op 3592 df-uni 3797 df-iun 3875 df-br 3990 df-opab 4051 df-mpt 4052 df-id 4278 df-xp 4617 df-rel 4618 df-cnv 4619 df-co 4620 df-dm 4621 df-rn 4622 df-res 4623 df-ima 4624 df-iota 5160 df-fun 5200 df-fn 5201 df-f 5202 df-f1 5203 df-fo 5204 df-f1o 5205 df-fv 5206 |
This theorem is referenced by: (None) |
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