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Theorem cnconst2 12402
Description: A constant function is continuous. (Contributed by Mario Carneiro, 19-Mar-2015.)
Assertion
Ref Expression
cnconst2 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) -> ( X X. { B } ) e. ( J Cn K ) )
Proof of Theorem cnconst2
Dummy variables x u y are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 fconst6g 5321 . . 3 |- ( B e. Y -> ( X X. { B } ) : X --> Y )
213ad2ant3 1004 . 2 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) -> ( X X. { B } ) : X --> Y )
32adantr 274 . . . 4 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> ( X X. { B } ) : X --> Y )
4 simpll3 1022 . . . . . . . 8 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> B e. Y )
5 simplr 519 . . . . . . . 8 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> x e. X )
6 fvconst2g 5634 . . . . . . . 8 |- ( ( B e. Y /\ x e. X ) -> ( ( X X. { B } ) ` x ) = B )
74, 5, 6syl2anc 408 . . . . . . 7 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> ( ( X X. { B } ) ` x ) = B )
87eleq1d 2208 . . . . . 6 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> ( ( ( X X. { B } ) ` x ) e. y <-> B e. y ) )
9 simpll1 1020 . . . . . . . . 9 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> J e. (TopOn ` X ) )
10 toponmax 12192 . . . . . . . . 9 |- ( J e. (TopOn ` X ) -> X e. J )
119, 10syl 14 . . . . . . . 8 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> X e. J )
12 simplr 519 . . . . . . . 8 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> x e. X )
13 df-ima 4552 . . . . . . . . 9 |- ( ( X X. { B } ) " X ) = ran ( ( X X. { B } ) |` X )
14 ssid 3117 . . . . . . . . . . . . 13 |- X C_ X
15 xpssres 4854 . . . . . . . . . . . . 13 |- ( X C_ X -> ( ( X X. { B } ) |` X ) = ( X X. { B } ) )
1614, 15ax-mp 5 . . . . . . . . . . . 12 |- ( ( X X. { B } ) |` X ) = ( X X. { B } )
1716rneqi 4767 . . . . . . . . . . 11 |- ran ( ( X X. { B } ) |` X ) = ran ( X X. { B } )
18 rnxpss 4970 . . . . . . . . . . 11 |- ran ( X X. { B } ) C_ { B }
1917, 18eqsstri 3129 . . . . . . . . . 10 |- ran ( ( X X. { B } ) |` X ) C_ { B }
20 simprr 521 . . . . . . . . . . 11 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> B e. y )
2120snssd 3665 . . . . . . . . . 10 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> { B } C_ y )
2219, 21sstrid 3108 . . . . . . . . 9 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> ran ( ( X X. { B } ) |` X ) C_ y )
2313, 22eqsstrid 3143 . . . . . . . 8 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> ( ( X X. { B } ) " X ) C_ y )
24 eleq2 2203 . . . . . . . . . 10 |- ( u = X -> ( x e. u <-> x e. X ) )
25 imaeq2 4877 . . . . . . . . . . 11 |- ( u = X -> ( ( X X. { B } ) " u ) = ( ( X X. { B } ) " X ) )
2625sseq1d 3126 . . . . . . . . . 10 |- ( u = X -> ( ( ( X X. { B } ) " u ) C_ y <-> ( ( X X. { B } ) " X ) C_ y ) )
2724, 26anbi12d 464 . . . . . . . . 9 |- ( u = X -> ( ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) <-> ( x e. X /\ ( ( X X. { B } ) " X ) C_ y ) ) )
2827rspcev 2789 . . . . . . . 8 |- ( ( X e. J /\ ( x e. X /\ ( ( X X. { B } ) " X ) C_ y ) ) -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) )
2911, 12, 23, 28syl12anc 1214 . . . . . . 7 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ ( y e. K /\ B e. y ) ) -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) )
3029expr 372 . . . . . 6 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> ( B e. y -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) ) )
318, 30sylbid 149 . . . . 5 |- ( ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) /\ y e. K ) -> ( ( ( X X. { B } ) ` x ) e. y -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) ) )
3231ralrimiva 2505 . . . 4 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> A. y e. K ( ( ( X X. { B } ) ` x ) e. y -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) ) )
33 simpl1 984 . . . . 5 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> J e. (TopOn ` X ) )
34 simpl2 985 . . . . 5 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> K e. (TopOn ` Y ) )
35 simpr 109 . . . . 5 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> x e. X )
36 iscnp 12368 . . . . 5 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ x e. X ) -> ( ( X X. { B } ) e. ( ( J CnP K ) ` x ) <-> ( ( X X. { B } ) : X --> Y /\ A. y e. K ( ( ( X X. { B } ) ` x ) e. y -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) ) ) ) )
3733, 34, 35, 36syl3anc 1216 . . . 4 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> ( ( X X. { B } ) e. ( ( J CnP K ) ` x ) <-> ( ( X X. { B } ) : X --> Y /\ A. y e. K ( ( ( X X. { B } ) ` x ) e. y -> E. u e. J ( x e. u /\ ( ( X X. { B } ) " u ) C_ y ) ) ) ) )
383, 32, 37mpbir2and 928 . . 3 |- ( ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) /\ x e. X ) -> ( X X. { B } ) e. ( ( J CnP K ) ` x ) )
3938ralrimiva 2505 . 2 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) -> A. x e. X ( X X. { B } ) e. ( ( J CnP K ) ` x ) )
40 cncnp 12399 . . 3 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) ) -> ( ( X X. { B } ) e. ( J Cn K ) <-> ( ( X X. { B } ) : X --> Y /\ A. x e. X ( X X. { B } ) e. ( ( J CnP K ) ` x ) ) ) )
41403adant3 1001 . 2 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) -> ( ( X X. { B } ) e. ( J Cn K ) <-> ( ( X X. { B } ) : X --> Y /\ A. x e. X ( X X. { B } ) e. ( ( J CnP K ) ` x ) ) ) )
422, 39, 41mpbir2and 928 1 |- ( ( J e. (TopOn ` X ) /\ K e. (TopOn ` Y ) /\ B e. Y ) -> ( X X. { B } ) e. ( J Cn K ) )
Colors of variables: wff set class
Syntax hints:   -> wi 4   /\ wa 103   <-> wb 104   /\ w3a 962   = wceq 1331   e. wcel 1480   A.wral 2416   E.wrex 2417   C_ wss 3071   {csn 3527   X. cxp 4537   ran crn 4540   |` cres 4541   "cima 4542   -->wf 5119   ` cfv 5123  (class class class)co 5774  TopOnctopon 12177   Cn ccn 12354   CnP ccnp 12355
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 603  ax-in2 604  ax-io 698  ax-5 1423  ax-7 1424  ax-gen 1425  ax-ie1 1469  ax-ie2 1470  ax-8 1482  ax-10 1483  ax-11 1484  ax-i12 1485  ax-bndl 1486  ax-4 1487  ax-13 1491  ax-14 1492  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-ext 2121  ax-coll 4043  ax-sep 4046  ax-pow 4098  ax-pr 4131  ax-un 4355  ax-setind 4452
This theorem depends on definitions:  df-bi 116  df-3an 964  df-tru 1334  df-fal 1337  df-nf 1437  df-sb 1736  df-eu 2002  df-mo 2003  df-clab 2126  df-cleq 2132  df-clel 2135  df-nfc 2270  df-ne 2309  df-ral 2421  df-rex 2422  df-reu 2423  df-rab 2425  df-v 2688  df-sbc 2910  df-csb 3004  df-dif 3073  df-un 3075  df-in 3077  df-ss 3084  df-pw 3512  df-sn 3533  df-pr 3534  df-op 3536  df-uni 3737  df-iun 3815  df-br 3930  df-opab 3990  df-mpt 3991  df-id 4215  df-xp 4545  df-rel 4546  df-cnv 4547  df-co 4548  df-dm 4549  df-rn 4550  df-res 4551  df-ima 4552  df-iota 5088  df-fun 5125  df-fn 5126  df-f 5127  df-f1 5128  df-fo 5129  df-f1o 5130  df-fv 5131  df-ov 5777  df-oprab 5778  df-mpo 5779  df-1st 6038  df-2nd 6039  df-map 6544  df-topgen 12141  df-top 12165  df-topon 12178  df-cn 12357  df-cnp 12358
This theorem is referenced by:  cnconst  12403  cnmptc  12451
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