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Mirrors > Home > MPE Home > Th. List > Mathboxes > topfne | Structured version Visualization version GIF version |
Description: Fineness for covers corresponds precisely with fineness for topologies. (Contributed by Jeff Hankins, 29-Sep-2009.) |
Ref | Expression |
---|---|
topfne.1 | ⊢ 𝑋 = ∪ 𝐽 |
topfne.2 | ⊢ 𝑌 = ∪ 𝐾 |
Ref | Expression |
---|---|
topfne | ⊢ ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽 ⊆ 𝐾 ↔ 𝐽Fne𝐾)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | tgtop 22123 | . . . 4 ⊢ (𝐾 ∈ Top → (topGen‘𝐾) = 𝐾) | |
2 | 1 | sseq2d 3953 | . . 3 ⊢ (𝐾 ∈ Top → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽 ⊆ 𝐾)) |
3 | 2 | bicomd 222 | . 2 ⊢ (𝐾 ∈ Top → (𝐽 ⊆ 𝐾 ↔ 𝐽 ⊆ (topGen‘𝐾))) |
4 | topfne.1 | . . . 4 ⊢ 𝑋 = ∪ 𝐽 | |
5 | topfne.2 | . . . 4 ⊢ 𝑌 = ∪ 𝐾 | |
6 | 4, 5 | isfne4 34529 | . . 3 ⊢ (𝐽Fne𝐾 ↔ (𝑋 = 𝑌 ∧ 𝐽 ⊆ (topGen‘𝐾))) |
7 | 6 | baibr 537 | . 2 ⊢ (𝑋 = 𝑌 → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽Fne𝐾)) |
8 | 3, 7 | sylan9bb 510 | 1 ⊢ ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽 ⊆ 𝐾 ↔ 𝐽Fne𝐾)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1539 ∈ wcel 2106 ⊆ wss 3887 ∪ cuni 4839 class class class wbr 5074 ‘cfv 6433 topGenctg 17148 Topctop 22042 Fnecfne 34525 |
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 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pow 5288 ax-pr 5352 ax-un 7588 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2889 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3434 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-pw 4535 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-br 5075 df-opab 5137 df-mpt 5158 df-id 5489 df-xp 5595 df-rel 5596 df-cnv 5597 df-co 5598 df-dm 5599 df-iota 6391 df-fun 6435 df-fv 6441 df-topgen 17154 df-top 22043 df-fne 34526 |
This theorem is referenced by: (None) |
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