Theorem fsuppcorn 7301

Description: The composition of a 1-1 function with a finitely supported function is finitely supported. The purpose of the ( F supp Z ) C_ ran G condition is to ensure we don't subset the support of the function in such a way as to fun afoul of exmidssfi 7246. (Other alternative conditions might also be sufficient). (Contributed by AV, 28-May-2019.) (Revised by Jim Kingdon, 15-May-2026.)

Hypotheses

Ref	Expression
fsuppco.f	|- ( ph -> F finSupp Z )
fsuppco.g	|- ( ph -> G : X -1-1-> Y )
fsuppco.z	|- ( ph -> Z e. W )
fsuppco.v	|- ( ph -> F e. V )
fsuppcorn.g	|- ( ph -> G e. U )
fsuppcorn.rn	|- ( ph -> ( F supp Z ) C_ ran G )

Assertion

Ref	Expression
fsuppcorn	|- ( ph -> ( F o. G ) finSupp Z )

Proof of Theorem fsuppcorn

Step	Hyp	Ref	Expression
1		fsuppco.v	. . 3 |- ( ph -> F e. V )
2		fsuppco.g	. . . 4 |- ( ph -> G : X -1-1-> Y )
3		df-f1 5382	. . . . 5 |- ( G : X -1-1-> Y <-> ( G : X --> Y /\ Fun `' G ) )
4	3	simprbi 275	. . . 4 |- ( G : X -1-1-> Y -> Fun `' G )
5	2, 4	syl 14	. . 3 |- ( ph -> Fun `' G )
6		cofunex2g 6339	. . 3 |- ( ( F e. V /\ Fun `' G ) -> ( F o. G ) e. _V )
7	1, 5, 6	syl2anc 415	. 2 |- ( ph -> ( F o. G ) e. _V )
8		fsuppco.z	. 2 |- ( ph -> Z e. W )
9		fsuppco.f	. . . 4 |- ( ph -> F finSupp Z )
10	9	fsuppfund 7294	. . 3 |- ( ph -> Fun F )
11		f1fun 5601	. . . 4 |- ( G : X -1-1-> Y -> Fun G )
12	2, 11	syl 14	. . 3 |- ( ph -> Fun G )
13		funco 5417	. . 3 |- ( ( Fun F /\ Fun G ) -> Fun ( F o. G ) )
14	10, 12, 13	syl2anc 415	. 2 |- ( ph -> Fun ( F o. G ) )
15		fsuppcorn.g	. . . 4 |- ( ph -> G e. U )
16		suppcofn 6506	. . . 4 |- ( ( ( F e. V /\ G e. U ) /\ ( Fun F /\ Fun G ) ) -> ( ( F o. G ) supp Z ) = ( `' G " ( F supp Z ) ) )
17	1, 15, 10, 12, 16	syl22anc 1279	. . 3 |- ( ph -> ( ( F o. G ) supp Z ) = ( `' G " ( F supp Z ) ) )
18	9	fsuppimpd 7293	. . . 4 |- ( ph -> ( F supp Z ) e. Fin )
19		f1cnv 5663	. . . . . . 7 |- ( G : X -1-1-> Y -> `' G : ran G -1-1-onto-> X )
20	2, 19	syl 14	. . . . . 6 |- ( ph -> `' G : ran G -1-1-onto-> X )
21		f1of1 5638	. . . . . 6 |- ( `' G : ran G -1-1-onto-> X -> `' G : ran G -1-1-> X )
22	20, 21	syl 14	. . . . 5 |- ( ph -> `' G : ran G -1-1-> X )
23		fsuppcorn.rn	. . . . 5 |- ( ph -> ( F supp Z ) C_ ran G )
24		f1imaeng 7079	. . . . 5 |- ( ( `' G : ran G -1-1-> X /\ ( F supp Z ) C_ ran G /\ ( F supp Z ) e. Fin ) -> ( `' G " ( F supp Z ) ) ~~ ( F supp Z ) )
25	22, 23, 18, 24	syl3anc 1278	. . . 4 |- ( ph -> ( `' G " ( F supp Z ) ) ~~ ( F supp Z ) )
26		enfii 7176	. . . 4 |- ( ( ( F supp Z ) e. Fin /\ ( `' G " ( F supp Z ) ) ~~ ( F supp Z ) ) -> ( `' G " ( F supp Z ) ) e. Fin )
27	18, 25, 26	syl2anc 415	. . 3 |- ( ph -> ( `' G " ( F supp Z ) ) e. Fin )
28	17, 27	eqeltrd 2315	. 2 |- ( ph -> ( ( F o. G ) supp Z ) e. Fin )
29	7, 8, 14, 28	isfsuppd 7290	1 |- ( ph -> ( F o. G ) finSupp Z )

This proof depends on syntax axioms:   -> wi 4   = wceq 1402   e. wcel 2209   _Vcvv 2821   C_ wss 3220   class class class wbr 4130   `'ccnv 4773   ran crn 4775   "cima 4777   o. ccom 4778   Fun wfun 5371   -->wf 5373   -1-1->wf1 5374   -1-1-onto->wf1o 5376  (class class class)co 6085   supp csupp 6475   ~~ cen 7020   Fincfn 7022   finSupp cfsupp 7285

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-in1 623  ax-in2 624  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-coll 4246  ax-sep 4249  ax-pow 4311  ax-pr 4346  ax-un 4578  ax-setind 4684

This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-fal 1408  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-ne 2421  df-ral 2533  df-rex 2534  df-reu 2535  df-rab 2537  df-v 2823  df-sbc 3052  df-csb 3148  df-dif 3222  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-uni 3936  df-iun 4014  df-br 4131  df-opab 4193  df-mpt 4194  df-id 4438  df-xp 4780  df-rel 4781  df-cnv 4782  df-co 4783  df-dm 4784  df-rn 4785  df-res 4786  df-ima 4787  df-iota 5337  df-fun 5379  df-fn 5380  df-f 5381  df-f1 5382  df-fo 5383  df-f1o 5384  df-fv 5385  df-ov 6088  df-oprab 6089  df-mpo 6090  df-supp 6476  df-er 6807  df-en 7023  df-fin 7025  df-fsupp 7286

This theorem is used by: (None)