Theorem fnsn 5946

Description: Functionality and domain of the singleton of an ordered pair. (Contributed by Jonathan Ben-Naim, 3-Jun-2011.)

Hypotheses

Ref	Expression
fnsn.1	|- A e. _V
fnsn.2	|- B e. _V

Assertion

Ref	Expression
fnsn	|- { <. A , B >. } Fn { A }

Proof of Theorem fnsn

Step	Hyp	Ref	Expression
1		fnsn.1	. 2 |- A e. _V
2		fnsn.2	. 2 |- B e. _V
3		fnsng 5938	. 2 |- ( ( A e. _V /\ B e. _V ) -> { <. A , B >. } Fn { A } )
4	1, 2, 3	mp2an 708	1 |- { <. A , B >. } Fn { A }

Syntax hints:   e. wcel 1990   _Vcvv 3200   {csn 4177   <.cop 4183   Fn wfn 5883

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-dm 5124  df-fun 5890  df-fn 5891

This theorem is referenced by:  f1osn  6176  fnsnb  6432  fvsnun2  6449  elixpsn  7947  axdc3lem4  9275  hashf1lem1  13239  axlowdimlem8  25829  axlowdimlem9  25830  axlowdimlem11  25832  axlowdimlem12  25833  bnj927  30839  cvmliftlem4  31270  cvmliftlem5  31271  finixpnum  33394  poimirlem3  33412