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Theorem fnconstg 5451
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 5450 . 2  |-  ( B  e.  V  ->  ( A  X.  { B }
) : A --> { B } )
2 ffn 5403 . 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 2164   {csn 3618    X. cxp 4657    Fn wfn 5249   -->wf 5250
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 1458  ax-7 1459  ax-gen 1460  ax-ie1 1504  ax-ie2 1505  ax-8 1515  ax-10 1516  ax-11 1517  ax-i12 1518  ax-bndl 1520  ax-4 1521  ax-17 1537  ax-i9 1541  ax-ial 1545  ax-i5r 1546  ax-14 2167  ax-ext 2175  ax-sep 4147  ax-pow 4203  ax-pr 4238
This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1367  df-nf 1472  df-sb 1774  df-eu 2045  df-mo 2046  df-clab 2180  df-cleq 2186  df-clel 2189  df-nfc 2325  df-ral 2477  df-rex 2478  df-v 2762  df-un 3157  df-in 3159  df-ss 3166  df-pw 3603  df-sn 3624  df-pr 3625  df-op 3627  df-br 4030  df-opab 4091  df-mpt 4092  df-id 4324  df-xp 4665  df-rel 4666  df-cnv 4667  df-co 4668  df-dm 4669  df-rn 4670  df-fun 5256  df-fn 5257  df-f 5258
This theorem is referenced by:  fconst2g  5773  ofc1g  6151  ofc2g  6152  dvidlemap  14845  nninfsellemeqinf  15506
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