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Theorem fnconstg 5585
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 5584 . 2  |-  ( B  e.  V  ->  ( A  X.  { B }
) : A --> { B } )
2 ffn 5528 . 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 2209   {csn 3705    X. cxp 4767    Fn wfn 5367   -->wf 5368
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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341
This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-br 4126  df-opab 4188  df-mpt 4189  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-fun 5374  df-fn 5375  df-f 5376
This theorem is referenced by:  fconst2g  5921  ofc1g  6314  ofc2g  6315  caofid0l  6319  caofid0r  6320  caofid1  6321  caofid2  6322  fczsupp0  6489  fczfsuppd  7287  pwsplusgval  14185  pwsmulrval  14186  dvidlemap  15715  dvidrelem  15716  dvidsslem  15717  nninfsellemeqinf  16964
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