Theorem rhmsubcrngc 45214

Description: The unital ring homomorphisms between unital rings (in a universe) are a subcategory of the category of non-unital rings. (Contributed by AV, 12-Mar-2020.)

Hypotheses

Ref	Expression
rhmsubcrngc.c	⊢ 𝐶 = (RngCat‘𝑈)
rhmsubcrngc.u	⊢ (𝜑 → 𝑈 ∈ 𝑉)
rhmsubcrngc.b	⊢ (𝜑 → 𝐵 = (Ring ∩ 𝑈))
rhmsubcrngc.h	⊢ (𝜑 → 𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))

Assertion

Ref	Expression
rhmsubcrngc	⊢ (𝜑 → 𝐻 ∈ (Subcat‘𝐶))

Proof of Theorem rhmsubcrngc

Dummy variables 𝑓 𝑔 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		rhmsubcrngc.u	. . . . 5 ⊢ (𝜑 → 𝑈 ∈ 𝑉)
2		rhmsubcrngc.b	. . . . 5 ⊢ (𝜑 → 𝐵 = (Ring ∩ 𝑈))
3		eqid 2734	. . . . . . 7 ⊢ (RngCat‘𝑈) = (RngCat‘𝑈)
4		eqid 2734	. . . . . . 7 ⊢ (Base‘(RngCat‘𝑈)) = (Base‘(RngCat‘𝑈))
5	3, 4, 1	rngcbas 45150	. . . . . 6 ⊢ (𝜑 → (Base‘(RngCat‘𝑈)) = (𝑈 ∩ Rng))
6		incom 4105	. . . . . 6 ⊢ (𝑈 ∩ Rng) = (Rng ∩ 𝑈)
7	5, 6	eqtrdi 2790	. . . . 5 ⊢ (𝜑 → (Base‘(RngCat‘𝑈)) = (Rng ∩ 𝑈))
8	1, 2, 7	rhmsscrnghm 45211	. . . 4 ⊢ (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHomo ↾ ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈)))))
9		rhmsubcrngc.c	. . . . . . . 8 ⊢ 𝐶 = (RngCat‘𝑈)
10	9	a1i 11	. . . . . . 7 ⊢ (𝜑 → 𝐶 = (RngCat‘𝑈))
11	10	fveq2d 6710	. . . . . 6 ⊢ (𝜑 → (Base‘𝐶) = (Base‘(RngCat‘𝑈)))
12	11	sqxpeqd 5572	. . . . 5 ⊢ (𝜑 → ((Base‘𝐶) × (Base‘𝐶)) = ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈))))
13	12	reseq2d 5840	. . . 4 ⊢ (𝜑 → ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))) = ( RngHomo ↾ ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈)))))
14	8, 13	breqtrrd 5071	. . 3 ⊢ (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
15		rhmsubcrngc.h	. . 3 ⊢ (𝜑 → 𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
16		eqid 2734	. . . . 5 ⊢ (Base‘𝐶) = (Base‘𝐶)
17	9, 16, 1	rngchomfeqhom 45154	. . . 4 ⊢ (𝜑 → (Homf ‘𝐶) = (Hom ‘𝐶))
18		eqid 2734	. . . . 5 ⊢ (Hom ‘𝐶) = (Hom ‘𝐶)
19	9, 16, 1, 18	rngchomfval 45151	. . . 4 ⊢ (𝜑 → (Hom ‘𝐶) = ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
20	17, 19	eqtrd 2774	. . 3 ⊢ (𝜑 → (Homf ‘𝐶) = ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
21	14, 15, 20	3brtr4d 5075	. 2 ⊢ (𝜑 → 𝐻 ⊆cat (Homf ‘𝐶))
22	9, 1, 2, 15	rhmsubcrngclem1 45212	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥))
23	9, 1, 2, 15	rhmsubcrngclem2 45213	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ∀𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧))
24	22, 23	jca 515	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ∀𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))
25	24	ralrimiva 3098	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐵 (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ∀𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))
26		eqid 2734	. . 3 ⊢ (Homf ‘𝐶) = (Homf ‘𝐶)
27		eqid 2734	. . 3 ⊢ (Id‘𝐶) = (Id‘𝐶)
28		eqid 2734	. . 3 ⊢ (comp‘𝐶) = (comp‘𝐶)
29	9	rngccat 45163	. . . 4 ⊢ (𝑈 ∈ 𝑉 → 𝐶 ∈ Cat)
30	1, 29	syl 17	. . 3 ⊢ (𝜑 → 𝐶 ∈ Cat)
31		incom 4105	. . . . 5 ⊢ (Ring ∩ 𝑈) = (𝑈 ∩ Ring)
32	2, 31	eqtrdi 2790	. . . 4 ⊢ (𝜑 → 𝐵 = (𝑈 ∩ Ring))
33	32, 15	rhmresfn 45194	. . 3 ⊢ (𝜑 → 𝐻 Fn (𝐵 × 𝐵))
34	26, 27, 28, 30, 33	issubc2 17314	. 2 ⊢ (𝜑 → (𝐻 ∈ (Subcat‘𝐶) ↔ (𝐻 ⊆cat (Homf ‘𝐶) ∧ ∀𝑥 ∈ 𝐵 (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ∀𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))))
35	21, 25, 34	mpbir2and 713	1 ⊢ (𝜑 → 𝐻 ∈ (Subcat‘𝐶))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1543   ∈ wcel 2110  ∀wral 3054   ∩ cin 3856  ⟨cop 4537   class class class wbr 5043   × cxp 5538   ↾ cres 5542  ‘cfv 6369  (class class class)co 7202  Basecbs 16684  Hom chom 16778  compcco 16779  Catccat 17139  Idccid 17140  Hom_f chomf 17141   ⊆_cat cssc 17284  Subcatcsubc 17286  Ringcrg 19534   RingHom crh 19704  Rngcrng 45059   RngHomo crngh 45070  RngCatcrngc 45142

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1976  ax-7 2016  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2158  ax-12 2175  ax-ext 2706  ax-rep 5168  ax-sep 5181  ax-nul 5188  ax-pow 5247  ax-pr 5311  ax-un 7512  ax-cnex 10768  ax-resscn 10769  ax-1cn 10770  ax-icn 10771  ax-addcl 10772  ax-addrcl 10773  ax-mulcl 10774  ax-mulrcl 10775  ax-mulcom 10776  ax-addass 10777  ax-mulass 10778  ax-distr 10779  ax-i2m1 10780  ax-1ne0 10781  ax-1rid 10782  ax-rnegex 10783  ax-rrecex 10784  ax-cnre 10785  ax-pre-lttri 10786  ax-pre-lttrn 10787  ax-pre-ltadd 10788  ax-pre-mulgt0 10789

This theorem depends on definitions:  df-bi 210  df-an 400  df-or 848  df-3or 1090  df-3an 1091  df-tru 1546  df-fal 1556  df-ex 1788  df-nf 1792  df-sb 2071  df-mo 2537  df-eu 2566  df-clab 2713  df-cleq 2726  df-clel 2812  df-nfc 2882  df-ne 2936  df-nel 3040  df-ral 3059  df-rex 3060  df-reu 3061  df-rmo 3062  df-rab 3063  df-v 3403  df-sbc 3688  df-csb 3803  df-dif 3860  df-un 3862  df-in 3864  df-ss 3874  df-pss 3876  df-nul 4228  df-if 4430  df-pw 4505  df-sn 4532  df-pr 4534  df-tp 4536  df-op 4538  df-uni 4810  df-iun 4896  df-br 5044  df-opab 5106  df-mpt 5125  df-tr 5151  df-id 5444  df-eprel 5449  df-po 5457  df-so 5458  df-fr 5498  df-we 5500  df-xp 5546  df-rel 5547  df-cnv 5548  df-co 5549  df-dm 5550  df-rn 5551  df-res 5552  df-ima 5553  df-pred 6149  df-ord 6205  df-on 6206  df-lim 6207  df-suc 6208  df-iota 6327  df-fun 6371  df-fn 6372  df-f 6373  df-f1 6374  df-fo 6375  df-f1o 6376  df-fv 6377  df-riota 7159  df-ov 7205  df-oprab 7206  df-mpo 7207  df-om 7634  df-1st 7750  df-2nd 7751  df-wrecs 8036  df-recs 8097  df-rdg 8135  df-1o 8191  df-er 8380  df-map 8499  df-pm 8500  df-ixp 8568  df-en 8616  df-dom 8617  df-sdom 8618  df-fin 8619  df-pnf 10852  df-mnf 10853  df-xr 10854  df-ltxr 10855  df-le 10856  df-sub 11047  df-neg 11048  df-nn 11814  df-2 11876  df-3 11877  df-4 11878  df-5 11879  df-6 11880  df-7 11881  df-8 11882  df-9 11883  df-n0 12074  df-z 12160  df-dec 12277  df-uz 12422  df-fz 13079  df-struct 16686  df-ndx 16687  df-slot 16688  df-base 16690  df-sets 16691  df-ress 16692  df-plusg 16780  df-hom 16791  df-cco 16792  df-0g 16918  df-cat 17143  df-cid 17144  df-homf 17145  df-ssc 17287  df-resc 17288  df-subc 17289  df-estrc 17602  df-mgm 18086  df-sgrp 18135  df-mnd 18146  df-mhm 18190  df-grp 18340  df-minusg 18341  df-ghm 18592  df-cmn 19144  df-abl 19145  df-mgp 19477  df-ur 19489  df-ring 19536  df-rnghom 19707  df-mgmhm 44960  df-rng0 45060  df-rnghomo 45072  df-rngc 45144  df-ringc 45190

This theorem is referenced by: (None)