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Theorem fnconstg 5472
Description: A cross product with a singleton is a constant function. (Contributed by NM, 24-Jul-2014.)
Assertion
Ref Expression
fnconstg  |-  ( B  e.  V  ->  ( A  X.  { B }
)  Fn  A )

Proof of Theorem fnconstg
StepHypRef Expression
1 fconstg 5471 . 2  |-  ( B  e.  V  ->  ( A  X.  { B }
) : A --> { B } )
2 ffn 5424 . 2  |-  ( ( A  X.  { B } ) : A --> { B }  ->  ( A  X.  { B }
)  Fn  A )
31, 2syl 14 1  |-  ( B  e.  V  ->  ( A  X.  { B }
)  Fn  A )
Colors of variables: wff set class
Syntax hints:    -> wi 4    e. wcel 2175   {csn 3632    X. cxp 4672    Fn wfn 5265   -->wf 5266
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-io 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-14 2178  ax-ext 2186  ax-sep 4161  ax-pow 4217  ax-pr 4252
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ral 2488  df-rex 2489  df-v 2773  df-un 3169  df-in 3171  df-ss 3178  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-br 4044  df-opab 4105  df-mpt 4106  df-id 4339  df-xp 4680  df-rel 4681  df-cnv 4682  df-co 4683  df-dm 4684  df-rn 4685  df-fun 5272  df-fn 5273  df-f 5274
This theorem is referenced by:  fconst2g  5798  ofc1g  6179  ofc2g  6180  caofid0l  6184  caofid0r  6185  caofid1  6186  caofid2  6187  pwsplusgval  13069  pwsmulrval  13070  dvidlemap  15105  dvidrelem  15106  dvidsslem  15107  nninfsellemeqinf  15886
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