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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 22251 | . . . 4 ⊢ (𝐾 ∈ Top → (topGen‘𝐾) = 𝐾) | |
2 | 1 | sseq2d 3975 | . . 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 34743 | . . 3 ⊢ (𝐽Fne𝐾 ↔ (𝑋 = 𝑌 ∧ 𝐽 ⊆ (topGen‘𝐾))) |
7 | 6 | baibr 538 | . 2 ⊢ (𝑋 = 𝑌 → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽Fne𝐾)) |
8 | 3, 7 | sylan9bb 511 | 1 ⊢ ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽 ⊆ 𝐾 ↔ 𝐽Fne𝐾)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ⊆ wss 3909 ∪ cuni 4864 class class class wbr 5104 ‘cfv 6492 topGenctg 17255 Topctop 22170 Fnecfne 34739 |
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 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2709 ax-sep 5255 ax-nul 5262 ax-pow 5319 ax-pr 5383 ax-un 7663 |
This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-nfc 2888 df-ne 2943 df-ral 3064 df-rex 3073 df-rab 3407 df-v 3446 df-dif 3912 df-un 3914 df-in 3916 df-ss 3926 df-nul 4282 df-if 4486 df-pw 4561 df-sn 4586 df-pr 4588 df-op 4592 df-uni 4865 df-br 5105 df-opab 5167 df-mpt 5188 df-id 5529 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-iota 6444 df-fun 6494 df-fv 6500 df-topgen 17261 df-top 22171 df-fne 34740 |
This theorem is referenced by: (None) |
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