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Theorem funsng 5590
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 5589 . 2  |-  Fun  `' { <. B ,  A >. }
2 cnvsng 5284 . . . 4  |-  ( ( B  e.  W  /\  A  e.  V )  ->  `' { <. B ,  A >. }  =  { <. A ,  B >. } )
32ancoms 454 . . 3  |-  ( ( A  e.  V  /\  B  e.  W )  ->  `' { <. B ,  A >. }  =  { <. A ,  B >. } )
43funeqd 5565 . 2  |-  ( ( A  e.  V  /\  B  e.  W )  ->  ( Fun  `' { <. B ,  A >. }  <->  Fun  { <. A ,  B >. } ) )
51, 4mpbii 214 1  |-  ( ( A  e.  V  /\  B  e.  W )  ->  Fun  { <. A ,  B >. } )
Colors of variables: wff setvar class
Syntax hints:    -> wi 4    /\ wa 370    = wceq 1437    e. wcel 1872   {csn 3941   <.cop 3947   `'ccnv 4795   Fun wfun 5538
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1663  ax-4 1676  ax-5 1752  ax-6 1798  ax-7 1843  ax-9 1876  ax-10 1891  ax-11 1896  ax-12 1909  ax-13 2063  ax-ext 2408  ax-sep 4489  ax-nul 4498  ax-pr 4603
This theorem depends on definitions:  df-bi 188  df-or 371  df-an 372  df-3an 984  df-tru 1440  df-ex 1658  df-nf 1662  df-sb 1791  df-eu 2280  df-mo 2281  df-clab 2415  df-cleq 2421  df-clel 2424  df-nfc 2558  df-ne 2601  df-ral 2719  df-rex 2720  df-rab 2723  df-v 3024  df-dif 3382  df-un 3384  df-in 3386  df-ss 3393  df-nul 3705  df-if 3855  df-sn 3942  df-pr 3944  df-op 3948  df-br 4367  df-opab 4426  df-id 4711  df-xp 4802  df-rel 4803  df-cnv 4804  df-co 4805  df-fun 5546
This theorem is referenced by:  fnsng  5591  funsn  5592  funprg  5593  funtpg  5594  tfrlem10  7060  snopfsupp  7859  funsnfsupp  7860  strle1  15164  constr3pthlem1  25325  bnj519  29496  bnj150  29639
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