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Theorem fnconstg 5531
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 5530 . 2  |-  ( B  e.  V  ->  ( A  X.  { B }
) : A --> { B } )
2 ffn 5479 . 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 2200   {csn 3667    X. cxp 4721    Fn wfn 5319   -->wf 5320
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 714  ax-5 1493  ax-7 1494  ax-gen 1495  ax-ie1 1539  ax-ie2 1540  ax-8 1550  ax-10 1551  ax-11 1552  ax-i12 1553  ax-bndl 1555  ax-4 1556  ax-17 1572  ax-i9 1576  ax-ial 1580  ax-i5r 1581  ax-14 2203  ax-ext 2211  ax-sep 4205  ax-pow 4262  ax-pr 4297
This theorem depends on definitions:  df-bi 117  df-3an 1004  df-tru 1398  df-nf 1507  df-sb 1809  df-eu 2080  df-mo 2081  df-clab 2216  df-cleq 2222  df-clel 2225  df-nfc 2361  df-ral 2513  df-rex 2514  df-v 2802  df-un 3202  df-in 3204  df-ss 3211  df-pw 3652  df-sn 3673  df-pr 3674  df-op 3676  df-br 4087  df-opab 4149  df-mpt 4150  df-id 4388  df-xp 4729  df-rel 4730  df-cnv 4731  df-co 4732  df-dm 4733  df-rn 4734  df-fun 5326  df-fn 5327  df-f 5328
This theorem is referenced by:  fconst2g  5864  ofc1g  6252  ofc2g  6253  caofid0l  6257  caofid0r  6258  caofid1  6259  caofid2  6260  pwsplusgval  13368  pwsmulrval  13369  dvidlemap  15405  dvidrelem  15406  dvidsslem  15407  nninfsellemeqinf  16554
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