Theorem topfne 33704

Description: Fineness for covers corresponds precisely with fineness for topologies. (Contributed by Jeff Hankins, 29-Sep-2009.)

Hypotheses

Ref	Expression
topfne.1	⊢ 𝑋 = ∪ 𝐽
topfne.2	⊢ 𝑌 = ∪ 𝐾

Assertion

Ref	Expression
topfne	⊢ ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽 ⊆ 𝐾 ↔ 𝐽Fne𝐾))

Proof of Theorem topfne

Step	Hyp	Ref	Expression
1		tgtop 21583	. . . 4 ⊢ (𝐾 ∈ Top → (topGen‘𝐾) = 𝐾)
2	1	sseq2d 4001	. . 3 ⊢ (𝐾 ∈ Top → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽 ⊆ 𝐾))
3	2	bicomd 225	. 2 ⊢ (𝐾 ∈ Top → (𝐽 ⊆ 𝐾 ↔ 𝐽 ⊆ (topGen‘𝐾)))
4		topfne.1	. . . 4 ⊢ 𝑋 = ∪ 𝐽
5		topfne.2	. . . 4 ⊢ 𝑌 = ∪ 𝐾
6	4, 5	isfne4 33690	. . 3 ⊢ (𝐽Fne𝐾 ↔ (𝑋 = 𝑌 ∧ 𝐽 ⊆ (topGen‘𝐾)))
7	6	baibr 539	. 2 ⊢ (𝑋 = 𝑌 → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽Fne𝐾))
8	3, 7	sylan9bb 512	1 ⊢ ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽 ⊆ 𝐾 ↔ 𝐽Fne𝐾))

Syntax hints:   → wi 4   ↔ wb 208   ∧ wa 398   = wceq 1537   ∈ wcel 2114   ⊆ wss 3938  ∪ cuni 4840   class class class wbr 5068  ‘cfv 6357  topGenctg 16713  Topctop 21503  Fnecfne 33686

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-mpt 5149  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-iota 6316  df-fun 6359  df-fv 6365  df-topgen 16719  df-top 21504  df-fne 33687

This theorem is referenced by: (None)