Theorem setsfun0 13117

Description: A structure with replacement without the empty set is a function if the original structure without the empty set is a function. This variant of setsfun 13116 is useful for proofs based on isstruct2r 13092 which requires Fun ( F \ { (/) } ) for F to be an extensible structure. (Contributed by AV, 7-Jun-2021.)

Assertion

Ref	Expression
setsfun0	|- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun ( ( G sSet <. I , E >. ) \ { (/) } ) )

Proof of Theorem setsfun0

Dummy variable x is distinct from all other variables.

Step	Hyp	Ref	Expression
1		funres 5367	. . . . 5 |- ( Fun ( G \ { (/) } ) -> Fun ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) )
2	1	ad2antlr 489	. . . 4 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) )
3		funsng 5376	. . . . 5 |- ( ( I e. U /\ E e. W ) -> Fun { <. I , E >. } )
4	3	adantl 277	. . . 4 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun { <. I , E >. } )
5		dmres 5034	. . . . . . 7 |- dom ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) = ( ( _V \ dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) )
6	5	ineq1i 3404	. . . . . 6 |- ( dom ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) i^i dom { <. I , E >. } ) = ( ( ( _V \ dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) ) i^i dom { <. I , E >. } )
7		in32 3419	. . . . . . 7 |- ( ( ( _V \ dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) ) i^i dom { <. I , E >. } ) = ( ( ( _V \ dom { <. I , E >. } ) i^i dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) )
8		incom 3399	. . . . . . . . 9 |- ( ( _V \ dom { <. I , E >. } ) i^i dom { <. I , E >. } ) = ( dom { <. I , E >. } i^i ( _V \ dom { <. I , E >. } ) )
9		disjdif 3567	. . . . . . . . 9 |- ( dom { <. I , E >. } i^i ( _V \ dom { <. I , E >. } ) ) = (/)
10	8, 9	eqtri 2252	. . . . . . . 8 |- ( ( _V \ dom { <. I , E >. } ) i^i dom { <. I , E >. } ) = (/)
11	10	ineq1i 3404	. . . . . . 7 |- ( ( ( _V \ dom { <. I , E >. } ) i^i dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) ) = ( (/) i^i dom ( G \ { (/) } ) )
12		0in 3530	. . . . . . 7 |- ( (/) i^i dom ( G \ { (/) } ) ) = (/)
13	7, 11, 12	3eqtri 2256	. . . . . 6 |- ( ( ( _V \ dom { <. I , E >. } ) i^i dom ( G \ { (/) } ) ) i^i dom { <. I , E >. } ) = (/)
14	6, 13	eqtri 2252	. . . . 5 |- ( dom ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) i^i dom { <. I , E >. } ) = (/)
15	14	a1i 9	. . . 4 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( dom ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) i^i dom { <. I , E >. } ) = (/) )
16		funun 5371	. . . 4 |- ( ( ( Fun ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) /\ Fun { <. I , E >. } ) /\ ( dom ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) i^i dom { <. I , E >. } ) = (/) ) -> Fun ( ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
17	2, 4, 15, 16	syl21anc 1272	. . 3 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun ( ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
18		difundir 3460	. . . . 5 |- ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) = ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) \ { (/) } ) u. ( { <. I , E >. } \ { (/) } ) )
19		resdifcom 5031	. . . . . . 7 |- ( ( G |` ( _V \ dom { <. I , E >. } ) ) \ { (/) } ) = ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) )
20	19	a1i 9	. . . . . 6 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( ( G |` ( _V \ dom { <. I , E >. } ) ) \ { (/) } ) = ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) )
21		elex 2814	. . . . . . . . 9 |- ( I e. U -> I e. _V )
22		elex 2814	. . . . . . . . 9 |- ( E e. W -> E e. _V )
23		opm 4326	. . . . . . . . . 10 |- ( E. x x e. <. I , E >. <-> ( I e. _V /\ E e. _V ) )
24		n0r 3508	. . . . . . . . . 10 |- ( E. x x e. <. I , E >. -> <. I , E >. =/= (/) )
25	23, 24	sylbir 135	. . . . . . . . 9 |- ( ( I e. _V /\ E e. _V ) -> <. I , E >. =/= (/) )
26	21, 22, 25	syl2an 289	. . . . . . . 8 |- ( ( I e. U /\ E e. W ) -> <. I , E >. =/= (/) )
27	26	adantl 277	. . . . . . 7 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> <. I , E >. =/= (/) )
28		disjsn2 3732	. . . . . . 7 |- ( <. I , E >. =/= (/) -> ( { <. I , E >. } i^i { (/) } ) = (/) )
29		disjdif2 3573	. . . . . . 7 |- ( ( { <. I , E >. } i^i { (/) } ) = (/) -> ( { <. I , E >. } \ { (/) } ) = { <. I , E >. } )
30	27, 28, 29	3syl 17	. . . . . 6 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( { <. I , E >. } \ { (/) } ) = { <. I , E >. } )
31	20, 30	uneq12d 3362	. . . . 5 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) \ { (/) } ) u. ( { <. I , E >. } \ { (/) } ) ) = ( ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
32	18, 31	eqtrid 2276	. . . 4 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) = ( ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
33	32	funeqd 5348	. . 3 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( Fun ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) <-> Fun ( ( ( G \ { (/) } ) |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) ) )
34	17, 33	mpbird 167	. 2 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) )
35		simpll 527	. . . . 5 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> G e. V )
36		opexg 4320	. . . . . 6 |- ( ( I e. U /\ E e. W ) -> <. I , E >. e. _V )
37	36	adantl 277	. . . . 5 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> <. I , E >. e. _V )
38		setsvalg 13111	. . . . 5 |- ( ( G e. V /\ <. I , E >. e. _V ) -> ( G sSet <. I , E >. ) = ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
39	35, 37, 38	syl2anc 411	. . . 4 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( G sSet <. I , E >. ) = ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) )
40	39	difeq1d 3324	. . 3 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( ( G sSet <. I , E >. ) \ { (/) } ) = ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) )
41	40	funeqd 5348	. 2 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> ( Fun ( ( G sSet <. I , E >. ) \ { (/) } ) <-> Fun ( ( ( G |` ( _V \ dom { <. I , E >. } ) ) u. { <. I , E >. } ) \ { (/) } ) ) )
42	34, 41	mpbird 167	1 |- ( ( ( G e. V /\ Fun ( G \ { (/) } ) ) /\ ( I e. U /\ E e. W ) ) -> Fun ( ( G sSet <. I , E >. ) \ { (/) } ) )

Syntax hints:   -> wi 4   /\ wa 104   = wceq 1397   E.wex 1540   e. wcel 2202   =/= wne 2402   _Vcvv 2802   \ cdif 3197   u. cun 3198   i^i cin 3199   (/)c0 3494   {csn 3669   <.cop 3672   dom cdm 4725   |` cres 4727   Fun wfun 5320  (class class class)co 6017   sSet csts 13079

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-in1 619  ax-in2 620  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-13 2204  ax-14 2205  ax-ext 2213  ax-sep 4207  ax-pow 4264  ax-pr 4299  ax-un 4530  ax-setind 4635

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  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-ne 2403  df-ral 2515  df-rex 2516  df-rab 2519  df-v 2804  df-sbc 3032  df-dif 3202  df-un 3204  df-in 3206  df-ss 3213  df-nul 3495  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-res 4737  df-iota 5286  df-fun 5328  df-fv 5334  df-ov 6020  df-oprab 6021  df-mpo 6022  df-sets 13088

This theorem is referenced by:  setsn0fun  13118