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Theorem rhmsubcrngc 46221
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 (𝜑𝑈𝑉)
rhmsubcrngc.b (𝜑𝐵 = (Ring ∩ 𝑈))
rhmsubcrngc.h (𝜑𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
Assertion
Ref Expression
rhmsubcrngc (𝜑𝐻 ∈ (Subcat‘𝐶))

Proof of Theorem rhmsubcrngc
Dummy variables 𝑓 𝑔 𝑥 𝑦 𝑧 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 rhmsubcrngc.u . . . . 5 (𝜑𝑈𝑉)
2 rhmsubcrngc.b . . . . 5 (𝜑𝐵 = (Ring ∩ 𝑈))
3 eqid 2737 . . . . . . 7 (RngCat‘𝑈) = (RngCat‘𝑈)
4 eqid 2737 . . . . . . 7 (Base‘(RngCat‘𝑈)) = (Base‘(RngCat‘𝑈))
53, 4, 1rngcbas 46157 . . . . . 6 (𝜑 → (Base‘(RngCat‘𝑈)) = (𝑈 ∩ Rng))
6 incom 4159 . . . . . 6 (𝑈 ∩ Rng) = (Rng ∩ 𝑈)
75, 6eqtrdi 2793 . . . . 5 (𝜑 → (Base‘(RngCat‘𝑈)) = (Rng ∩ 𝑈))
81, 2, 7rhmsscrnghm 46218 . . . 4 (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHomo ↾ ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈)))))
9 rhmsubcrngc.c . . . . . . . 8 𝐶 = (RngCat‘𝑈)
109a1i 11 . . . . . . 7 (𝜑𝐶 = (RngCat‘𝑈))
1110fveq2d 6843 . . . . . 6 (𝜑 → (Base‘𝐶) = (Base‘(RngCat‘𝑈)))
1211sqxpeqd 5663 . . . . 5 (𝜑 → ((Base‘𝐶) × (Base‘𝐶)) = ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈))))
1312reseq2d 5935 . . . 4 (𝜑 → ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))) = ( RngHomo ↾ ((Base‘(RngCat‘𝑈)) × (Base‘(RngCat‘𝑈)))))
148, 13breqtrrd 5131 . . 3 (𝜑 → ( RingHom ↾ (𝐵 × 𝐵)) ⊆cat ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
15 rhmsubcrngc.h . . 3 (𝜑𝐻 = ( RingHom ↾ (𝐵 × 𝐵)))
16 eqid 2737 . . . . 5 (Base‘𝐶) = (Base‘𝐶)
179, 16, 1rngchomfeqhom 46161 . . . 4 (𝜑 → (Homf𝐶) = (Hom ‘𝐶))
18 eqid 2737 . . . . 5 (Hom ‘𝐶) = (Hom ‘𝐶)
199, 16, 1, 18rngchomfval 46158 . . . 4 (𝜑 → (Hom ‘𝐶) = ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
2017, 19eqtrd 2777 . . 3 (𝜑 → (Homf𝐶) = ( RngHomo ↾ ((Base‘𝐶) × (Base‘𝐶))))
2114, 15, 203brtr4d 5135 . 2 (𝜑𝐻cat (Homf𝐶))
229, 1, 2, 15rhmsubcrngclem1 46219 . . . 4 ((𝜑𝑥𝐵) → ((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥))
239, 1, 2, 15rhmsubcrngclem2 46220 . . . 4 ((𝜑𝑥𝐵) → ∀𝑦𝐵𝑧𝐵𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧))
2422, 23jca 512 . . 3 ((𝜑𝑥𝐵) → (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦𝐵𝑧𝐵𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))
2524ralrimiva 3141 . 2 (𝜑 → ∀𝑥𝐵 (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦𝐵𝑧𝐵𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))
26 eqid 2737 . . 3 (Homf𝐶) = (Homf𝐶)
27 eqid 2737 . . 3 (Id‘𝐶) = (Id‘𝐶)
28 eqid 2737 . . 3 (comp‘𝐶) = (comp‘𝐶)
299rngccat 46170 . . . 4 (𝑈𝑉𝐶 ∈ Cat)
301, 29syl 17 . . 3 (𝜑𝐶 ∈ Cat)
31 incom 4159 . . . . 5 (Ring ∩ 𝑈) = (𝑈 ∩ Ring)
322, 31eqtrdi 2793 . . . 4 (𝜑𝐵 = (𝑈 ∩ Ring))
3332, 15rhmresfn 46201 . . 3 (𝜑𝐻 Fn (𝐵 × 𝐵))
3426, 27, 28, 30, 33issubc2 17681 . 2 (𝜑 → (𝐻 ∈ (Subcat‘𝐶) ↔ (𝐻cat (Homf𝐶) ∧ ∀𝑥𝐵 (((Id‘𝐶)‘𝑥) ∈ (𝑥𝐻𝑥) ∧ ∀𝑦𝐵𝑧𝐵𝑓 ∈ (𝑥𝐻𝑦)∀𝑔 ∈ (𝑦𝐻𝑧)(𝑔(⟨𝑥, 𝑦⟩(comp‘𝐶)𝑧)𝑓) ∈ (𝑥𝐻𝑧)))))
3521, 25, 34mpbir2and 711 1 (𝜑𝐻 ∈ (Subcat‘𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 396   = wceq 1541  wcel 2106  wral 3062  cin 3907  cop 4590   class class class wbr 5103   × cxp 5629  cres 5633  cfv 6493  (class class class)co 7351  Basecbs 17042  Hom chom 17103  compcco 17104  Catccat 17503  Idccid 17504  Homf chomf 17505  cat cssc 17649  Subcatcsubc 17651  Ringcrg 19917   RingHom crh 20095  Rngcrng 46066   RngHomo crngh 46077  RngCatcrngc 46149
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-10 2137  ax-11 2154  ax-12 2171  ax-ext 2708  ax-rep 5240  ax-sep 5254  ax-nul 5261  ax-pow 5318  ax-pr 5382  ax-un 7664  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086
This theorem depends on definitions:  df-bi 206  df-an 397  df-or 846  df-3or 1088  df-3an 1089  df-tru 1544  df-fal 1554  df-ex 1782  df-nf 1786  df-sb 2068  df-mo 2539  df-eu 2568  df-clab 2715  df-cleq 2729  df-clel 2815  df-nfc 2887  df-ne 2942  df-nel 3048  df-ral 3063  df-rex 3072  df-rmo 3351  df-reu 3352  df-rab 3406  df-v 3445  df-sbc 3738  df-csb 3854  df-dif 3911  df-un 3913  df-in 3915  df-ss 3925  df-pss 3927  df-nul 4281  df-if 4485  df-pw 4560  df-sn 4585  df-pr 4587  df-tp 4589  df-op 4591  df-uni 4864  df-iun 4954  df-br 5104  df-opab 5166  df-mpt 5187  df-tr 5221  df-id 5529  df-eprel 5535  df-po 5543  df-so 5544  df-fr 5586  df-we 5588  df-xp 5637  df-rel 5638  df-cnv 5639  df-co 5640  df-dm 5641  df-rn 5642  df-res 5643  df-ima 5644  df-pred 6251  df-ord 6318  df-on 6319  df-lim 6320  df-suc 6321  df-iota 6445  df-fun 6495  df-fn 6496  df-f 6497  df-f1 6498  df-fo 6499  df-f1o 6500  df-fv 6501  df-riota 7307  df-ov 7354  df-oprab 7355  df-mpo 7356  df-om 7795  df-1st 7913  df-2nd 7914  df-frecs 8204  df-wrecs 8235  df-recs 8309  df-rdg 8348  df-1o 8404  df-er 8606  df-map 8725  df-pm 8726  df-ixp 8794  df-en 8842  df-dom 8843  df-sdom 8844  df-fin 8845  df-pnf 11149  df-mnf 11150  df-xr 11151  df-ltxr 11152  df-le 11153  df-sub 11345  df-neg 11346  df-nn 12112  df-2 12174  df-3 12175  df-4 12176  df-5 12177  df-6 12178  df-7 12179  df-8 12180  df-9 12181  df-n0 12372  df-z 12458  df-dec 12577  df-uz 12722  df-fz 13379  df-struct 16978  df-sets 16995  df-slot 17013  df-ndx 17025  df-base 17043  df-ress 17072  df-plusg 17105  df-hom 17116  df-cco 17117  df-0g 17282  df-cat 17507  df-cid 17508  df-homf 17509  df-ssc 17652  df-resc 17653  df-subc 17654  df-estrc 17969  df-mgm 18456  df-sgrp 18505  df-mnd 18516  df-mhm 18560  df-grp 18710  df-minusg 18711  df-ghm 18964  df-cmn 19522  df-abl 19523  df-mgp 19855  df-ur 19872  df-ring 19919  df-rnghom 20098  df-mgmhm 45967  df-rng0 46067  df-rnghomo 46079  df-rngc 46151  df-ringc 46197
This theorem is referenced by: (None)
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