Theorem mptfng 5458

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 2977	. . 3 |- ( B e. _V <-> E! y y = B )
2	1	ralbii 2538	. 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 4152	. . . 4 |- ( x e. A |-> B ) = { <. x , y >. | ( x e. A /\ y = B ) }
5	3, 4	eqtri 2252	. . 3 |- F = { <. x , y >. | ( x e. A /\ y = B ) }
6	5	fnopabg 5456	. 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 1397   E!weu 2079   e. wcel 2202   A.wral 2510   _Vcvv 2802   {copab 4149   |-> cmpt 4150   Fn wfn 5321

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 716  ax-5 1495  ax-7 1496  ax-gen 1497  ax-ie1 1541  ax-ie2 1542  ax-8 1552  ax-10 1553  ax-11 1554  ax-i12 1555  ax-bndl 1557  ax-4 1558  ax-17 1574  ax-i9 1578  ax-ial 1582  ax-i5r 1583  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-nf 1509  df-sb 1811  df-eu 2082  df-mo 2083  df-clab 2218  df-cleq 2224  df-clel 2227  df-nfc 2363  df-ral 2515  df-rex 2516  df-v 2804  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-br 4089  df-opab 4151  df-mpt 4152  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-fun 5328  df-fn 5329

This theorem is referenced by:  fnmpt  5459  fnmpti  5461  mpteqb  5737  cc3  7486