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Theorem cnmptc 15005
Description: A constant function is continuous. (Contributed by Mario Carneiro, 5-May-2014.) (Revised by Mario Carneiro, 22-Aug-2015.)
Hypotheses
Ref Expression
cnmptid.j  |-  ( ph  ->  J  e.  (TopOn `  X ) )
cnmptc.k  |-  ( ph  ->  K  e.  (TopOn `  Y ) )
cnmptc.p  |-  ( ph  ->  P  e.  Y )
Assertion
Ref Expression
cnmptc  |-  ( ph  ->  ( x  e.  X  |->  P )  e.  ( J  Cn  K ) )
Distinct variable groups:    ph, x    x, J    x, X    x, Y    x, K    x, P

Proof of Theorem cnmptc
StepHypRef Expression
1 fconstmpt 4773 . 2  |-  ( X  X.  { P }
)  =  ( x  e.  X  |->  P )
2 cnmptid.j . . 3  |-  ( ph  ->  J  e.  (TopOn `  X ) )
3 cnmptc.k . . 3  |-  ( ph  ->  K  e.  (TopOn `  Y ) )
4 cnmptc.p . . 3  |-  ( ph  ->  P  e.  Y )
5 cnconst2 14956 . . 3  |-  ( ( J  e.  (TopOn `  X )  /\  K  e.  (TopOn `  Y )  /\  P  e.  Y
)  ->  ( X  X.  { P } )  e.  ( J  Cn  K ) )
62, 3, 4, 5syl3anc 1273 . 2  |-  ( ph  ->  ( X  X.  { P } )  e.  ( J  Cn  K ) )
71, 6eqeltrrid 2319 1  |-  ( ph  ->  ( x  e.  X  |->  P )  e.  ( J  Cn  K ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2202   {csn 3669    |-> cmpt 4150    X. cxp 4723   ` cfv 5326  (class class class)co 6017  TopOnctopon 14733    Cn ccn 14908
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 619  ax-in2 620  ax-io 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-13 2204  ax-14 2205  ax-ext 2213  ax-coll 4204  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635
This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ne 2403  df-ral 2515  df-rex 2516  df-reu 2517  df-rab 2519  df-v 2804  df-sbc 3032  df-csb 3128  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-iun 3972  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-res 4737  df-ima 4738  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-f1 5331  df-fo 5332  df-f1o 5333  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-1st 6302  df-2nd 6303  df-map 6818  df-topgen 13342  df-top 14721  df-topon 14734  df-cn 14911  df-cnp 14912
This theorem is referenced by:  cnmpt2c  15013  imasnopn  15022  fsumcncntop  15290  expcn  15292  plycn  15485
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