Theorem dff3im 5844

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 5550	. 2 |- ( F : A --> B -> F C_ ( A X. B ) )
2		ffun 5531	. . . . . . . 8 |- ( F : A --> B -> Fun F )
3	2	adantr 276	. . . . . . 7 |- ( ( F : A --> B /\ x e. A ) -> Fun F )
4		fdm 5534	. . . . . . . . 9 |- ( F : A --> B -> dom F = A )
5	4	eleq2d 2308	. . . . . . . 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 5812	. . . . . . 7 |- ( ( Fun F /\ x e. dom F ) -> <. x , ( F ` x ) >. e. F )
8	3, 6, 7	syl2anc 415	. . . . . 6 |- ( ( F : A --> B /\ x e. A ) -> <. x , ( F ` x ) >. e. F )
9		df-br 4126	. . . . . 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 5707	. . . . . . 7 |- ( ( Fun F /\ x e. dom F ) -> ( F ` x ) e. _V )
12		breq2 4129	. . . . . . . 8 |- ( y = ( F ` x ) -> ( x F y <-> x F ( F ` x ) ) )
13	12	spcegv 2913	. . . . . . 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 415	. . . . 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 5387	. . . . . 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 2134	. . . 4 |- ( E! y x F y <-> ( E. y x F y /\ E* y x F y ) )
21	16, 19, 20	sylanbrc 421	. . 3 |- ( ( F : A --> B /\ x e. A ) -> E! y x F y )
22	21	ralrimiva 2623	. 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 1545   E!weu 2086   E*wmo 2087   e. wcel 2209   A.wral 2528   _Vcvv 2821   C_ wss 3220   <.cop 3708   class class class wbr 4125   X. cxp 4767   dom cdm 4769   Fun wfun 5366   -->wf 5368   ` cfv 5372

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 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4244  ax-pow 4306  ax-pr 4341

This theorem depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-sbc 3052  df-un 3224  df-in 3226  df-ss 3233  df-pw 3687  df-sn 3711  df-pr 3712  df-op 3714  df-uni 3931  df-br 4126  df-opab 4188  df-id 4433  df-xp 4775  df-rel 4776  df-cnv 4777  df-co 4778  df-dm 4779  df-rn 4780  df-iota 5332  df-fun 5374  df-fn 5375  df-f 5376  df-fv 5380

This theorem is referenced by:  dff4im  5845