Theorem rhmsubcrngc 20583

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 2731	. . . . . . 7 ⊢ (RngCat‘𝑈) = (RngCat‘𝑈)
4		eqid 2731	. . . . . . 7 ⊢ (Base‘(RngCat‘𝑈)) = (Base‘(RngCat‘𝑈))
5	3, 4, 1	rngcbas 20536	. . . . . 6 ⊢ (𝜑 → (Base‘(RngCat‘𝑈)) = (𝑈 ∩ Rng))
6		incom 4156	. . . . . 6 ⊢ (𝑈 ∩ Rng) = (Rng ∩ 𝑈)
7	5, 6	eqtrdi 2782	. . . . 5 ⊢ (𝜑 → (Base‘(RngCat‘𝑈)) = (Rng ∩ 𝑈))
8	1, 2, 7	rhmsscrnghm 20580	. . . 4 ⊢ (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHom ↾ ((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 6826	. . . . . 6 ⊢ (𝜑 → (Base‘𝐶) = (Base‘(RngCat‘𝑈)))
12	11	sqxpeqd 5646	. . . . 5 ⊢ (𝜑 → ((Base‘𝐶) × (Base‘𝐶)) = ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈))))
13	12	reseq2d 5927	. . . 4 ⊢ (𝜑 → ( RngHom ↾ ((Base‘𝐶) × (Base‘𝐶))) = ( RngHom ↾ ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈)))))
14	8, 13	breqtrrd 5117	. . 3 ⊢ (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHom ↾ ((Base‘𝐶) × (Base‘𝐶))))
15		rhmsubcrngc.h	. . 3 ⊢ (𝜑 → 𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
16		eqid 2731	. . . . 5 ⊢ (Base‘𝐶) = (Base‘𝐶)
17	9, 16, 1	rngchomfeqhom 20540	. . . 4 ⊢ (𝜑 → (Homf ‘𝐶) = (Hom ‘𝐶))
18		eqid 2731	. . . . 5 ⊢ (Hom ‘𝐶) = (Hom ‘𝐶)
19	9, 16, 1, 18	rngchomfval 20537	. . . 4 ⊢ (𝜑 → (Hom ‘𝐶) = ( RngHom ↾ ((Base‘𝐶) × (Base‘𝐶))))
20	17, 19	eqtrd 2766	. . 3 ⊢ (𝜑 → (Homf ‘𝐶) = ( RngHom ↾ ((Base‘𝐶) × (Base‘𝐶))))
21	14, 15, 20	3brtr4d 5121	. 2 ⊢ (𝜑 → 𝐻 ⊆cat (Homf ‘𝐶))
22	9, 1, 2, 15	rhmsubcrngclem1 20581	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥))
23	9, 1, 2, 15	rhmsubcrngclem2 20582	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝐵) → ∀𝑦 ∈ 𝐵 ∀𝑧 ∈ 𝐵 ∀𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧))
24	22, 23	jca 511	. . 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 3124	. 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 2731	. . 3 ⊢ (Homf ‘𝐶) = (Homf ‘𝐶)
27		eqid 2731	. . 3 ⊢ (Id‘𝐶) = (Id‘𝐶)
28		eqid 2731	. . 3 ⊢ (comp‘𝐶) = (comp‘𝐶)
29	9	rngccat 20549	. . . 4 ⊢ (𝑈 ∈ 𝑉 → 𝐶 ∈ Cat)
30	1, 29	syl 17	. . 3 ⊢ (𝜑 → 𝐶 ∈ Cat)
31		incom 4156	. . . . 5 ⊢ (Ring ∩ 𝑈) = (𝑈 ∩ Ring)
32	2, 31	eqtrdi 2782	. . . 4 ⊢ (𝜑 → 𝐵 = (𝑈 ∩ Ring))
33	32, 15	rhmresfn 20563	. . 3 ⊢ (𝜑 → 𝐻 Fn (𝐵 × 𝐵))
34	26, 27, 28, 30, 33	issubc2 17743	. 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 395   = wceq 1541   ∈ wcel 2111  ∀wral 3047   ∩ cin 3896  ⟨cop 4579   class class class wbr 5089   × cxp 5612   ↾ cres 5616  ‘cfv 6481  (class class class)co 7346  Basecbs 17120  Hom chom 17172  compcco 17173  Catccat 17570  Idccid 17571  Hom_f chomf 17572   ⊆_cat cssc 17714  Subcatcsubc 17716  Rngcrng 20070  Ringcrg 20151   RngHom crnghm 20352   RingHom crh 20387  RngCatcrngc 20531

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-10 2144  ax-11 2160  ax-12 2180  ax-ext 2703  ax-rep 5215  ax-sep 5232  ax-nul 5242  ax-pow 5301  ax-pr 5368  ax-un 7668  ax-cnex 11062  ax-resscn 11063  ax-1cn 11064  ax-icn 11065  ax-addcl 11066  ax-addrcl 11067  ax-mulcl 11068  ax-mulrcl 11069  ax-mulcom 11070  ax-addass 11071  ax-mulass 11072  ax-distr 11073  ax-i2m1 11074  ax-1ne0 11075  ax-1rid 11076  ax-rnegex 11077  ax-rrecex 11078  ax-cnre 11079  ax-pre-lttri 11080  ax-pre-lttrn 11081  ax-pre-ltadd 11082  ax-pre-mulgt0 11083

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-nf 1785  df-sb 2068  df-mo 2535  df-eu 2564  df-clab 2710  df-cleq 2723  df-clel 2806  df-nfc 2881  df-ne 2929  df-nel 3033  df-ral 3048  df-rex 3057  df-rmo 3346  df-reu 3347  df-rab 3396  df-v 3438  df-sbc 3737  df-csb 3846  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-pss 3917  df-nul 4281  df-if 4473  df-pw 4549  df-sn 4574  df-pr 4576  df-tp 4578  df-op 4580  df-uni 4857  df-iun 4941  df-br 5090  df-opab 5152  df-mpt 5171  df-tr 5197  df-id 5509  df-eprel 5514  df-po 5522  df-so 5523  df-fr 5567  df-we 5569  df-xp 5620  df-rel 5621  df-cnv 5622  df-co 5623  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-pred 6248  df-ord 6309  df-on 6310  df-lim 6311  df-suc 6312  df-iota 6437  df-fun 6483  df-fn 6484  df-f 6485  df-f1 6486  df-fo 6487  df-f1o 6488  df-fv 6489  df-riota 7303  df-ov 7349  df-oprab 7350  df-mpo 7351  df-om 7797  df-1st 7921  df-2nd 7922  df-frecs 8211  df-wrecs 8242  df-recs 8291  df-rdg 8329  df-1o 8385  df-er 8622  df-map 8752  df-pm 8753  df-ixp 8822  df-en 8870  df-dom 8871  df-sdom 8872  df-fin 8873  df-pnf 11148  df-mnf 11149  df-xr 11150  df-ltxr 11151  df-le 11152  df-sub 11346  df-neg 11347  df-nn 12126  df-2 12188  df-3 12189  df-4 12190  df-5 12191  df-6 12192  df-7 12193  df-8 12194  df-9 12195  df-n0 12382  df-z 12469  df-dec 12589  df-uz 12733  df-fz 13408  df-struct 17058  df-sets 17075  df-slot 17093  df-ndx 17105  df-base 17121  df-ress 17142  df-plusg 17174  df-hom 17185  df-cco 17186  df-0g 17345  df-cat 17574  df-cid 17575  df-homf 17576  df-ssc 17717  df-resc 17718  df-subc 17719  df-estrc 18029  df-mgm 18548  df-mgmhm 18600  df-sgrp 18627  df-mnd 18643  df-mhm 18691  df-grp 18849  df-minusg 18850  df-ghm 19125  df-cmn 19694  df-abl 19695  df-mgp 20059  df-rng 20071  df-ur 20100  df-ring 20153  df-rnghm 20354  df-rhm 20390  df-rngc 20532  df-ringc 20561

This theorem is referenced by: (None)