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| Mirrors > Home > MPE Home > Th. List > intexab | Structured version Visualization version GIF version | ||
| Description: The intersection of a nonempty class abstraction exists. (Contributed by NM, 21-Oct-2003.) |
| Ref | Expression |
|---|---|
| intexab | ⊢ (∃𝑥𝜑 ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | abn0 4339 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) | |
| 2 | intex 5301 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) | |
| 3 | 1, 2 | bitr3i 279 | 1 ⊢ (∃𝑥𝜑 ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 208 ∃wex 1800 ∈ wcel 2143 {cab 2741 ≠ wne 2958 Vcvv 3455 ∅c0 4286 ∩ cint 4906 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1816 ax-4 1830 ax-5 1931 ax-6 1988 ax-7 2029 ax-8 2145 ax-9 2153 ax-10 2176 ax-11 2192 ax-12 2213 ax-ext 2735 ax-sep 5247 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1564 df-fal 1574 df-ex 1801 df-nf 1805 df-sb 2092 df-clab 2742 df-cleq 2755 df-clel 2838 df-ne 2959 df-ral 3078 df-rex 3088 df-rab 3416 df-v 3457 df-dif 3908 df-in 3912 df-ss 3922 df-nul 4287 df-int 4907 |
| This theorem is referenced by: intexrab 5304 tcmin 9692 cfval 10214 efgval 19767 tz9.1regs 35434 tz9.1ctco 36847 dfttc3gw 36888 relintabex 44162 rclexi 44196 rtrclex 44198 trclexi 44201 rtrclexi 44202 aiotaexb 47674 |
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