Theorem dff3im 5792

Description: Property of a mapping. (Contributed by Jim Kingdon, 4-Jan-2019.)

Assertion

Ref	Expression
dff3im	|- ( F : A --> B -> ( F C_ ( A X. B ) /\ A. x e. A E! y x F y ) )

Distinct variable groups:   x, y, A   x, B, y   x, F, y

Proof of Theorem dff3im

Step	Hyp	Ref	Expression
1		fssxp 5502	. 2 |- ( F : A --> B -> F C_ ( A X. B ) )
2		ffun 5485	. . . . . . . 8 |- ( F : A --> B -> Fun F )
3	2	adantr 276	. . . . . . 7 |- ( ( F : A --> B /\ x e. A ) -> Fun F )
4		fdm 5488	. . . . . . . . 9 |- ( F : A --> B -> dom F = A )
5	4	eleq2d 2301	. . . . . . . 8 |- ( F : A --> B -> ( x e. dom F <-> x e. A ) )
6	5	biimpar 297	. . . . . . 7 |- ( ( F : A --> B /\ x e. A ) -> x e. dom F )
7		funfvop 5759	. . . . . . 7 |- ( ( Fun F /\ x e. dom F ) -> <. x , ( F ` x ) >. e. F )
8	3, 6, 7	syl2anc 411	. . . . . 6 |- ( ( F : A --> B /\ x e. A ) -> <. x , ( F ` x ) >. e. F )
9		df-br 4089	. . . . . 6 |- ( x F ( F ` x ) <-> <. x , ( F ` x ) >. e. F )
10	8, 9	sylibr 134	. . . . 5 |- ( ( F : A --> B /\ x e. A ) -> x F ( F ` x ) )
11		funfvex 5656	. . . . . . 7 |- ( ( Fun F /\ x e. dom F ) -> ( F ` x ) e. _V )
12		breq2 4092	. . . . . . . 8 |- ( y = ( F ` x ) -> ( x F y <-> x F ( F ` x ) ) )
13	12	spcegv 2894	. . . . . . 7 |- ( ( F ` x ) e. _V -> ( x F ( F ` x ) -> E. y x F y ) )
14	11, 13	syl 14	. . . . . 6 |- ( ( Fun F /\ x e. dom F ) -> ( x F ( F ` x ) -> E. y x F y ) )
15	3, 6, 14	syl2anc 411	. . . . 5 |- ( ( F : A --> B /\ x e. A ) -> ( x F ( F ` x ) -> E. y x F y ) )
16	10, 15	mpd 13	. . . 4 |- ( ( F : A --> B /\ x e. A ) -> E. y x F y )
17		funmo 5341	. . . . . 6 |- ( Fun F -> E* y x F y )
18	2, 17	syl 14	. . . . 5 |- ( F : A --> B -> E* y x F y )
19	18	adantr 276	. . . 4 |- ( ( F : A --> B /\ x e. A ) -> E* y x F y )
20		eu5 2127	. . . 4 |- ( E! y x F y <-> ( E. y x F y /\ E* y x F y ) )
21	16, 19, 20	sylanbrc 417	. . 3 |- ( ( F : A --> B /\ x e. A ) -> E! y x F y )
22	21	ralrimiva 2605	. 2 |- ( F : A --> B -> A. x e. A E! y x F y )
23	1, 22	jca 306	1 |- ( F : A --> B -> ( F C_ ( A X. B ) /\ A. x e. A E! y x F y ) )

Syntax hints:   -> wi 4   /\ wa 104   E.wex 1540   E!weu 2079   E*wmo 2080   e. wcel 2202   A.wral 2510   _Vcvv 2802   C_ wss 3200   <.cop 3672   class class class wbr 4088   X. cxp 4723   dom cdm 4725   Fun wfun 5320   -->wf 5322   ` cfv 5326

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-sbc 3032  df-un 3204  df-in 3206  df-ss 3213  df-pw 3654  df-sn 3675  df-pr 3676  df-op 3678  df-uni 3894  df-br 4089  df-opab 4151  df-id 4390  df-xp 4731  df-rel 4732  df-cnv 4733  df-co 4734  df-dm 4735  df-rn 4736  df-iota 5286  df-fun 5328  df-fn 5329  df-f 5330  df-fv 5334

This theorem is referenced by:  dff4im  5793