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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 4316 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) | |
| 2 | intex 5275 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) | |
| 3 | 1, 2 | bitr3i 278 | 1 ⊢ (∃𝑥𝜑 ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 207 ∃wex 1782 ∈ wcel 2115 {cab 2714 ≠ wne 2931 Vcvv 3428 ∅c0 4264 ∩ cint 4880 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1970 ax-7 2011 ax-8 2117 ax-9 2125 ax-10 2148 ax-11 2164 ax-12 2185 ax-ext 2708 ax-sep 5221 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-or 850 df-3an 1090 df-tru 1546 df-fal 1556 df-ex 1783 df-nf 1787 df-sb 2070 df-clab 2715 df-cleq 2728 df-clel 2811 df-ne 2932 df-ral 3051 df-rex 3061 df-rab 3389 df-v 3430 df-dif 3889 df-in 3893 df-ss 3903 df-nul 4265 df-int 4881 |
| This theorem is referenced by: intexrab 5278 tcmin 9654 cfval 10163 efgval 19686 tz9.1regs 35321 tz9.1ctco 36707 dfttc3gw 36748 relintabex 44022 rclexi 44056 rtrclex 44058 trclexi 44061 rtrclexi 44062 aiotaexb 47549 |
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