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| Mirrors > Home > MPE Home > Th. List > intexrab | Structured version Visualization version GIF version | ||
| Description: The intersection of a nonempty restricted class abstraction exists. (Contributed by NM, 21-Oct-2003.) |
| Ref | Expression |
|---|---|
| intexrab | ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∩ {𝑥 ∈ 𝐴 ∣ 𝜑} ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | intexab 5292 | . 2 ⊢ (∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑) ↔ ∩ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} ∈ V) | |
| 2 | df-rex 3062 | . 2 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∃𝑥(𝑥 ∈ 𝐴 ∧ 𝜑)) | |
| 3 | df-rab 3401 | . . . 4 ⊢ {𝑥 ∈ 𝐴 ∣ 𝜑} = {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} | |
| 4 | 3 | inteqi 4907 | . . 3 ⊢ ∩ {𝑥 ∈ 𝐴 ∣ 𝜑} = ∩ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} |
| 5 | 4 | eleq1i 2828 | . 2 ⊢ (∩ {𝑥 ∈ 𝐴 ∣ 𝜑} ∈ V ↔ ∩ {𝑥 ∣ (𝑥 ∈ 𝐴 ∧ 𝜑)} ∈ V) |
| 6 | 1, 2, 5 | 3bitr4i 303 | 1 ⊢ (∃𝑥 ∈ 𝐴 𝜑 ↔ ∩ {𝑥 ∈ 𝐴 ∣ 𝜑} ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∃wex 1781 ∈ wcel 2114 {cab 2715 ∃wrex 3061 {crab 3400 Vcvv 3441 ∩ cint 4903 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2709 ax-sep 5242 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3062 df-rab 3401 df-v 3443 df-dif 3905 df-in 3909 df-ss 3919 df-nul 4287 df-int 4904 |
| This theorem is referenced by: onintrab2 7744 rankf 9710 rankvalb 9713 cardf2 9859 tskmval 10754 rgspnval 20549 lspval 20930 aspval 21832 clsval 22985 spanval 31391 fldgenval 33375 |
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