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 33311
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 21265 . . . 4 (𝐾 ∈ Top → (topGen‘𝐾) = 𝐾)
21sseq2d 3920 . . 3 (𝐾 ∈ Top → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽𝐾))
32bicomd 224 . 2 (𝐾 ∈ Top → (𝐽𝐾𝐽 ⊆ (topGen‘𝐾)))
4 topfne.1 . . . 4 𝑋 = 𝐽
5 topfne.2 . . . 4 𝑌 = 𝐾
64, 5isfne4 33297 . . 3 (𝐽Fne𝐾 ↔ (𝑋 = 𝑌𝐽 ⊆ (topGen‘𝐾)))
76baibr 537 . 2 (𝑋 = 𝑌 → (𝐽 ⊆ (topGen‘𝐾) ↔ 𝐽Fne𝐾))
83, 7sylan9bb 510 1 ((𝐾 ∈ Top ∧ 𝑋 = 𝑌) → (𝐽𝐾𝐽Fne𝐾))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 207  wa 396   = wceq 1522  wcel 2081  wss 3859   cuni 4745   class class class wbr 4962  cfv 6225  topGenctg 16540  Topctop 21185  Fnecfne 33293
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1777  ax-4 1791  ax-5 1888  ax-6 1947  ax-7 1992  ax-8 2083  ax-9 2091  ax-10 2112  ax-11 2126  ax-12 2141  ax-13 2344  ax-ext 2769  ax-sep 5094  ax-nul 5101  ax-pow 5157  ax-pr 5221  ax-un 7319
This theorem depends on definitions:  df-bi 208  df-an 397  df-or 843  df-3an 1082  df-tru 1525  df-ex 1762  df-nf 1766  df-sb 2043  df-mo 2576  df-eu 2612  df-clab 2776  df-cleq 2788  df-clel 2863  df-nfc 2935  df-ral 3110  df-rex 3111  df-rab 3114  df-v 3439  df-sbc 3707  df-dif 3862  df-un 3864  df-in 3866  df-ss 3874  df-nul 4212  df-if 4382  df-pw 4455  df-sn 4473  df-pr 4475  df-op 4479  df-uni 4746  df-br 4963  df-opab 5025  df-mpt 5042  df-id 5348  df-xp 5449  df-rel 5450  df-cnv 5451  df-co 5452  df-dm 5453  df-iota 6189  df-fun 6227  df-fv 6233  df-topgen 16546  df-top 21186  df-fne 33294
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator