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Theorem funsn 5939
Description: A singleton of an ordered pair is a function. Theorem 10.5 of [Quine] p. 65. (Contributed by NM, 12-Aug-1994.)
Hypotheses
Ref Expression
funsn.1  |-  A  e. 
_V
funsn.2  |-  B  e. 
_V
Assertion
Ref Expression
funsn  |-  Fun  { <. A ,  B >. }

Proof of Theorem funsn
StepHypRef Expression
1 funsn.1 . 2  |-  A  e. 
_V
2 funsn.2 . 2  |-  B  e. 
_V
3 funsng 5937 . 2  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  Fun  { <. A ,  B >. } )
41, 2, 3mp2an 708 1  |-  Fun  { <. A ,  B >. }
Colors of variables: wff setvar class
Syntax hints:    e. wcel 1990   _Vcvv 3200   {csn 4177   <.cop 4183   Fun wfun 5882
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1722  ax-4 1737  ax-5 1839  ax-6 1888  ax-7 1935  ax-9 1999  ax-10 2019  ax-11 2034  ax-12 2047  ax-13 2246  ax-ext 2602  ax-sep 4781  ax-nul 4789  ax-pr 4906
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3an 1039  df-tru 1486  df-ex 1705  df-nf 1710  df-sb 1881  df-eu 2474  df-mo 2475  df-clab 2609  df-cleq 2615  df-clel 2618  df-nfc 2753  df-ral 2917  df-rex 2918  df-rab 2921  df-v 3202  df-dif 3577  df-un 3579  df-in 3581  df-ss 3588  df-nul 3916  df-if 4087  df-sn 4178  df-pr 4180  df-op 4184  df-br 4654  df-opab 4713  df-id 5024  df-xp 5120  df-rel 5121  df-cnv 5122  df-co 5123  df-fun 5890
This theorem is referenced by:  funtp  5945  fun0  5954  funop  6414  funsndifnop  6416  fvsn  6446  wfrlem13  7427  dcomex  9269  axdc3lem4  9275  xpsc0  16220  xpsc1  16221  cnfldfun  19758  bnj1421  31110  funop1  41302
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