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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 4337 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∃𝑥𝜑) | |
| 2 | intex 5309 | . 2 ⊢ ({𝑥 ∣ 𝜑} ≠ ∅ ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) | |
| 3 | 1, 2 | bitr3i 280 | 1 ⊢ (∃𝑥𝜑 ↔ ∩ {𝑥 ∣ 𝜑} ∈ V) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∃wex 1812 ∈ wcel 2147 {cab 2741 ≠ wne 2959 Vcvv 3454 ∅c0 4281 ∩ cint 4910 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 |
| This proof depends on definitions: df-bi 210 df-an 402 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-nul 4282 df-int 4911 |
| This theorem is used by: intexrab 5312 tcmin 9767 cfval 10351 efgval 19961 tz9.1regs 35902 tz9.1ctco 37448 dfttc3gw 37489 relintabex 44774 rclexi 44807 rtrclex 44809 trclexi 44812 rtrclexi 44813 aiotaexb 48364 |
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