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Theorem funsng 5264
Description: A singleton of an ordered pair is a function. Theorem 10.5 of [Quine] p. 65. (Contributed by NM, 28-Jun-2011.)
Assertion
Ref Expression
funsng  |-  ( ( A  e.  V  /\  B  e.  W )  ->  Fun  { <. A ,  B >. } )

Proof of Theorem funsng
StepHypRef Expression
1 funcnvsn 5263 . 2  |-  Fun  `' { <. B ,  A >. }
2 cnvsng 5157 . . . 4  |-  ( ( B  e.  W  /\  A  e.  V )  ->  `' { <. B ,  A >. }  =  { <. A ,  B >. } )
32ancoms 441 . . 3  |-  ( ( A  e.  V  /\  B  e.  W )  ->  `' { <. B ,  A >. }  =  { <. A ,  B >. } )
43funeqd 5243 . 2  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( Fun  `' { <. B ,  A >. }  <->  Fun  { <. A ,  B >. } ) )
51, 4mpbii 204 1  |-  ( ( A  e.  V  /\  B  e.  W )  ->  Fun  { <. A ,  B >. } )
Colors of variables: wff set class
Syntax hints:    -> wi 6    /\ wa 360    = wceq 1624    e. wcel 1685   {csn 3642   <.cop 3645   `'ccnv 4688   Fun wfun 5216
This theorem is referenced by:  fnsng  5265  funsn  5266  funprg  5267  tfrlem10  6399  strle1  13234  bnj519  28032  bnj150  28176
This theorem was proved from axioms:  ax-1 7  ax-2 8  ax-3 9  ax-mp 10  ax-gen 1534  ax-5 1545  ax-17 1604  ax-9 1637  ax-8 1645  ax-14 1689  ax-6 1704  ax-7 1709  ax-11 1716  ax-12 1868  ax-ext 2266  ax-sep 4143  ax-nul 4151  ax-pr 4214
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3an 938  df-tru 1312  df-ex 1530  df-nf 1533  df-sb 1632  df-eu 2149  df-mo 2150  df-clab 2272  df-cleq 2278  df-clel 2281  df-nfc 2410  df-ne 2450  df-ral 2550  df-rex 2551  df-rab 2554  df-v 2792  df-dif 3157  df-un 3159  df-in 3161  df-ss 3168  df-nul 3458  df-if 3568  df-sn 3648  df-pr 3649  df-op 3651  df-br 4026  df-opab 4080  df-id 4309  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-fun 5224
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