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| Mirrors > Home > MPE Home > Th. List > filunibas | Structured version Visualization version GIF version | ||
| Description: Recover the base set from a filter. (Contributed by Stefan O'Rear, 2-Aug-2015.) |
| Ref | Expression |
|---|---|
| filunibas | ⊢ (𝐹 ∈ (Fil‘𝑋) → ∪ 𝐹 = 𝑋) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | filsspw 24131 | . . 3 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝐹 ⊆ 𝒫 𝑋) | |
| 2 | sspwuni 5059 | . . 3 ⊢ (𝐹 ⊆ 𝒫 𝑋 ↔ ∪ 𝐹 ⊆ 𝑋) | |
| 3 | 1, 2 | sylib 221 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) → ∪ 𝐹 ⊆ 𝑋) |
| 4 | filtop 24135 | . 2 ⊢ (𝐹 ∈ (Fil‘𝑋) → 𝑋 ∈ 𝐹) | |
| 5 | unissel 4899 | . 2 ⊢ ((∪ 𝐹 ⊆ 𝑋 ∧ 𝑋 ∈ 𝐹) → ∪ 𝐹 = 𝑋) | |
| 6 | 3, 4, 5 | syl2anc 596 | 1 ⊢ (𝐹 ∈ (Fil‘𝑋) → ∪ 𝐹 = 𝑋) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2145 ⊆ wss 3898 𝒫 cpw 4556 ∪ cuni 4866 ‘cfv 6527 Filcfil 24125 |
| 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 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2732 ax-sep 5248 ax-nul 5259 ax-pow 5326 ax-pr 5390 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2564 df-eu 2594 df-clab 2739 df-cleq 2752 df-clel 2835 df-nfc 2909 df-ne 2956 df-nel 3062 df-ral 3077 df-rex 3087 df-rab 3413 df-v 3452 df-sbc 3739 df-csb 3847 df-dif 3901 df-un 3903 df-in 3905 df-ss 3915 df-nul 4279 df-if 4482 df-pw 4558 df-sn 4584 df-pr 4586 df-op 4590 df-uni 4867 df-br 5103 df-opab 5167 df-mpt 5186 df-id 5542 df-xp 5653 df-rel 5654 df-cnv 5655 df-co 5656 df-dm 5657 df-rn 5658 df-res 5659 df-ima 5660 df-iota 6483 df-fun 6529 df-fv 6535 df-fbas 21636 df-fil 24126 |
| This theorem is used by: filunirn 24162 filconn 24163 uffixfr 24203 uffix2 24204 uffixsn 24205 ufildr 24211 flimtopon 24250 flimss1 24253 flffval 24269 fclsval 24288 isfcls 24289 fclstopon 24292 fclsfnflim 24307 fcfval 24313 |
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