Users' Mathboxes Mathbox for Jeff Hankins < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  topfne Structured version   Visualization version   GIF version

Theorem topfne 36714
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) → (𝐽𝐾𝐽Fne𝐾))

Proof of Theorem topfne
StepHypRef Expression
1 tgtop 23033 . . . 4 (𝐾 ∈ Top → (topGen‘𝐾) = 𝐾)
21sseq2d 3968 . . 3 (𝐾 ∈ Top → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽𝐾))
32bicomd 225 . 2 (𝐾 ∈ Top → (𝐽𝐾𝐽 ⊆ (topGen‘𝐾)))
4 topfne.1 . . . 4 𝑋 = 𝐽
5 topfne.2 . . . 4 𝑌 = 𝐾
64, 5isfne4 36700 . . 3 (𝐽Fne𝐾 ↔ (𝑋 = 𝑌𝐽 ⊆ (topGen‘𝐾)))
76baibr 544 . 2 (𝑋 = 𝑌 → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽Fne𝐾))
83, 7sylan9bb 517 1 ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽𝐾𝐽Fne𝐾))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 208  wa 399   = wceq 1560  wcel 2142  wss 3904   cuni 4865   class class class wbr 5100  cfv 6521  topGenctg 17466  Topctop 22953  Fnecfne 36696
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1815  ax-4 1829  ax-5 1930  ax-6 1987  ax-7 2028  ax-8 2144  ax-9 2152  ax-10 2175  ax-11 2191  ax-12 2212  ax-ext 2734  ax-sep 5246  ax-nul 5256  ax-pow 5322  ax-pr 5390  ax-un 7718
This theorem depends on definitions:  df-bi 209  df-an 400  df-or 859  df-3an 1100  df-tru 1563  df-fal 1573  df-ex 1800  df-nf 1804  df-sb 2091  df-mo 2566  df-eu 2596  df-clab 2741  df-cleq 2754  df-clel 2837  df-nfc 2911  df-ne 2958  df-ral 3077  df-rex 3087  df-rab 3415  df-v 3456  df-dif 3907  df-un 3909  df-in 3911  df-ss 3921  df-nul 4286  df-if 4481  df-pw 4557  df-sn 4583  df-pr 4585  df-op 4589  df-uni 4866  df-br 5101  df-opab 5163  df-mpt 5182  df-id 5542  df-xp 5653  df-rel 5654  df-cnv 5655  df-co 5656  df-dm 5657  df-iota 6477  df-fun 6523  df-fv 6529  df-topgen 17472  df-top 22954  df-fne 36697
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator