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Theorem dfcon2OLD 26253
Description: An alternate definition of connectedness. (Moved into main set.mm as dfcon2 17145 and may be deleted by mathbox owner, JGH. --NM 29-May-2014.) (Contributed by Jeff Hankins, 9-Jul-2009.) (Revised by Mario Carneiro, 8-Apr-2015.) (Proof modification is discouraged.) (New usage is discouraged.)
Hypothesis
Ref Expression
dfcon2OLD.1  |-  X  = 
U. J
Assertion
Ref Expression
dfcon2OLD  |-  ( J  e.  Top  ->  ( J  e.  Con  <->  A. x  e.  J  A. y  e.  J  ( (
x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  X  =/=  ( x  u.  y
) ) ) )
Distinct variable groups:    x, y, J    x, X, y

Proof of Theorem dfcon2OLD
StepHypRef Expression
1 dfcon2OLD.1 . . . 4  |-  X  = 
U. J
21toptopon 16671 . . 3  |-  ( J  e.  Top  <->  J  e.  (TopOn `  X ) )
3 dfcon2 17145 . . 3  |-  ( J  e.  (TopOn `  X
)  ->  ( J  e.  Con  <->  A. x  e.  J  A. y  e.  J  ( ( x  =/=  (/)  /\  y  =/=  (/)  /\  (
x  i^i  y )  =  (/) )  ->  (
x  u.  y )  =/=  X ) ) )
42, 3sylbi 187 . 2  |-  ( J  e.  Top  ->  ( J  e.  Con  <->  A. x  e.  J  A. y  e.  J  ( (
x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  ( x  u.  y )  =/= 
X ) ) )
5 necom 2527 . . . 4  |-  ( ( x  u.  y )  =/=  X  <->  X  =/=  ( x  u.  y
) )
65imbi2i 303 . . 3  |-  ( ( ( x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  ( x  u.  y )  =/= 
X )  <->  ( (
x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  X  =/=  ( x  u.  y
) ) )
762ralbii 2569 . 2  |-  ( A. x  e.  J  A. y  e.  J  (
( x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  ( x  u.  y )  =/= 
X )  <->  A. x  e.  J  A. y  e.  J  ( (
x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  X  =/=  ( x  u.  y
) ) )
84, 7syl6bb 252 1  |-  ( J  e.  Top  ->  ( J  e.  Con  <->  A. x  e.  J  A. y  e.  J  ( (
x  =/=  (/)  /\  y  =/=  (/)  /\  ( x  i^i  y )  =  (/) )  ->  X  =/=  ( x  u.  y
) ) ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ w3a 934    = wceq 1623    e. wcel 1684    =/= wne 2446   A.wral 2543    u. cun 3150    i^i cin 3151   (/)c0 3455   U.cuni 3827   ` cfv 5255   Topctop 16631  TopOnctopon 16632   Conccon 17137
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-ral 2548  df-rex 2549  df-rab 2552  df-v 2790  df-sbc 2992  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-iota 5219  df-fun 5257  df-fn 5258  df-fv 5263  df-top 16636  df-topon 16639  df-cld 16756  df-con 17138
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