Theorem mptfng 5400

Description: The maps-to notation defines a function with domain. (Contributed by Scott Fenton, 21-Mar-2011.)

Hypothesis

Ref	Expression
mptfng.1	|- F = ( x e. A |-> B )

Assertion

Ref	Expression
mptfng	|- ( A. x e. A B e. _V <-> F Fn A )

Distinct variable group:   x, A

Allowed substitution hints:   B( x)   F( x)

Proof of Theorem mptfng

Dummy variable y is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eueq 2943	. . 3 |- ( B e. _V <-> E! y y = B )
2	1	ralbii 2511	. 2 |- ( A. x e. A B e. _V <-> A. x e. A E! y y = B )
3		mptfng.1	. . . 4 |- F = ( x e. A |-> B )
4		df-mpt 4106	. . . 4 |- ( x e. A |-> B ) = { <. x , y >. | ( x e. A /\ y = B ) }
5	3, 4	eqtri 2225	. . 3 |- F = { <. x , y >. | ( x e. A /\ y = B ) }
6	5	fnopabg 5398	. 2 |- ( A. x e. A E! y y = B <-> F Fn A )
7	2, 6	bitri 184	1 |- ( A. x e. A B e. _V <-> F Fn A )

Syntax hints:   /\ wa 104   <-> wb 105   = wceq 1372   E!weu 2053   e. wcel 2175   A.wral 2483   _Vcvv 2771   {copab 4103   |-> cmpt 4104   Fn wfn 5265

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 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-14 2178  ax-ext 2186  ax-sep 4161  ax-pow 4217  ax-pr 4252

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ral 2488  df-rex 2489  df-v 2773  df-un 3169  df-in 3171  df-ss 3178  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-br 4044  df-opab 4105  df-mpt 4106  df-id 4339  df-xp 4680  df-rel 4681  df-cnv 4682  df-co 4683  df-dm 4684  df-fun 5272  df-fn 5273

This theorem is referenced by:  fnmpt  5401  fnmpti  5403  mpteqb  5669  cc3  7379