Theorem resrhm 14286

Description: Restriction of a ring homomorphism to a subring is a homomorphism. (Contributed by Mario Carneiro, 12-Mar-2015.)

Hypothesis

Ref	Expression
resrhm.u	⊢ 𝑈 = (𝑆 ↾s 𝑋)

Assertion

Ref	Expression
resrhm	⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝐹 ↾ 𝑋) ∈ (𝑈 RingHom 𝑇))

Proof of Theorem resrhm

Step	Hyp	Ref	Expression
1		rhmrcl2 14194	. . 3 ⊢ (𝐹 ∈ (𝑆 RingHom 𝑇) → 𝑇 ∈ Ring)
2		resrhm.u	. . . 4 ⊢ 𝑈 = (𝑆 ↾s 𝑋)
3	2	subrgring 14262	. . 3 ⊢ (𝑋 ∈ (SubRing‘𝑆) → 𝑈 ∈ Ring)
4	1, 3	anim12ci 339	. 2 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝑈 ∈ Ring ∧ 𝑇 ∈ Ring))
5		rhmghm 14200	. . . 4 ⊢ (𝐹 ∈ (𝑆 RingHom 𝑇) → 𝐹 ∈ (𝑆 GrpHom 𝑇))
6		subrgsubg 14265	. . . 4 ⊢ (𝑋 ∈ (SubRing‘𝑆) → 𝑋 ∈ (SubGrp‘𝑆))
7	2	resghm 13870	. . . 4 ⊢ ((𝐹 ∈ (𝑆 GrpHom 𝑇) ∧ 𝑋 ∈ (SubGrp‘𝑆)) → (𝐹 ↾ 𝑋) ∈ (𝑈 GrpHom 𝑇))
8	5, 6, 7	syl2an 289	. . 3 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝐹 ↾ 𝑋) ∈ (𝑈 GrpHom 𝑇))
9		eqid 2230	. . . . . 6 ⊢ (mulGrp‘𝑆) = (mulGrp‘𝑆)
10		eqid 2230	. . . . . 6 ⊢ (mulGrp‘𝑇) = (mulGrp‘𝑇)
11	9, 10	rhmmhm 14197	. . . . 5 ⊢ (𝐹 ∈ (𝑆 RingHom 𝑇) → 𝐹 ∈ ((mulGrp‘𝑆) MndHom (mulGrp‘𝑇)))
12	9	subrgsubm 14272	. . . . 5 ⊢ (𝑋 ∈ (SubRing‘𝑆) → 𝑋 ∈ (SubMnd‘(mulGrp‘𝑆)))
13		eqid 2230	. . . . . 6 ⊢ ((mulGrp‘𝑆) ↾s 𝑋) = ((mulGrp‘𝑆) ↾s 𝑋)
14	13	resmhm 13593	. . . . 5 ⊢ ((𝐹 ∈ ((mulGrp‘𝑆) MndHom (mulGrp‘𝑇)) ∧ 𝑋 ∈ (SubMnd‘(mulGrp‘𝑆))) → (𝐹 ↾ 𝑋) ∈ (((mulGrp‘𝑆) ↾s 𝑋) MndHom (mulGrp‘𝑇)))
15	11, 12, 14	syl2an 289	. . . 4 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝐹 ↾ 𝑋) ∈ (((mulGrp‘𝑆) ↾s 𝑋) MndHom (mulGrp‘𝑇)))
16		rhmrcl1 14193	. . . . . 6 ⊢ (𝐹 ∈ (𝑆 RingHom 𝑇) → 𝑆 ∈ Ring)
17	2, 9	mgpress 13968	. . . . . 6 ⊢ ((𝑆 ∈ Ring ∧ 𝑋 ∈ (SubRing‘𝑆)) → ((mulGrp‘𝑆) ↾s 𝑋) = (mulGrp‘𝑈))
18	16, 17	sylan 283	. . . . 5 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → ((mulGrp‘𝑆) ↾s 𝑋) = (mulGrp‘𝑈))
19	18	oveq1d 6038	. . . 4 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (((mulGrp‘𝑆) ↾s 𝑋) MndHom (mulGrp‘𝑇)) = ((mulGrp‘𝑈) MndHom (mulGrp‘𝑇)))
20	15, 19	eleqtrd 2309	. . 3 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝐹 ↾ 𝑋) ∈ ((mulGrp‘𝑈) MndHom (mulGrp‘𝑇)))
21	8, 20	jca 306	. 2 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → ((𝐹 ↾ 𝑋) ∈ (𝑈 GrpHom 𝑇) ∧ (𝐹 ↾ 𝑋) ∈ ((mulGrp‘𝑈) MndHom (mulGrp‘𝑇))))
22		eqid 2230	. . 3 ⊢ (mulGrp‘𝑈) = (mulGrp‘𝑈)
23	22, 10	isrhm 14196	. 2 ⊢ ((𝐹 ↾ 𝑋) ∈ (𝑈 RingHom 𝑇) ↔ ((𝑈 ∈ Ring ∧ 𝑇 ∈ Ring) ∧ ((𝐹 ↾ 𝑋) ∈ (𝑈 GrpHom 𝑇) ∧ (𝐹 ↾ 𝑋) ∈ ((mulGrp‘𝑈) MndHom (mulGrp‘𝑇)))))
24	4, 21, 23	sylanbrc 417	1 ⊢ ((𝐹 ∈ (𝑆 RingHom 𝑇) ∧ 𝑋 ∈ (SubRing‘𝑆)) → (𝐹 ↾ 𝑋) ∈ (𝑈 RingHom 𝑇))

Syntax hints:   → wi 4   ∧ wa 104   = wceq 1397   ∈ wcel 2201   ↾ cres 4729  ‘cfv 5328  (class class class)co 6023   ↾_s cress 13106   MndHom cmhm 13563  SubMndcsubmnd 13564  SubGrpcsubg 13777   GrpHom cghm 13850  mulGrpcmgp 13957  Ringcrg 14033   RingHom crh 14188  SubRingcsubrg 14255

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 2203  ax-14 2204  ax-ext 2212  ax-coll 4205  ax-sep 4208  ax-pow 4266  ax-pr 4301  ax-un 4532  ax-setind 4637  ax-cnex 8128  ax-resscn 8129  ax-1cn 8130  ax-1re 8131  ax-icn 8132  ax-addcl 8133  ax-addrcl 8134  ax-mulcl 8135  ax-addcom 8137  ax-addass 8139  ax-i2m1 8142  ax-0lt1 8143  ax-0id 8145  ax-rnegex 8146  ax-pre-ltirr 8149  ax-pre-lttrn 8151  ax-pre-ltadd 8153

This theorem depends on definitions:  df-bi 117  df-3an 1006  df-tru 1400  df-fal 1403  df-nf 1509  df-sb 1810  df-eu 2081  df-mo 2082  df-clab 2217  df-cleq 2223  df-clel 2226  df-nfc 2362  df-ne 2402  df-nel 2497  df-ral 2514  df-rex 2515  df-reu 2516  df-rmo 2517  df-rab 2518  df-v 2803  df-sbc 3031  df-csb 3127  df-dif 3201  df-un 3203  df-in 3205  df-ss 3212  df-nul 3494  df-pw 3655  df-sn 3676  df-pr 3677  df-op 3679  df-uni 3895  df-int 3930  df-iun 3973  df-br 4090  df-opab 4152  df-mpt 4153  df-id 4392  df-xp 4733  df-rel 4734  df-cnv 4735  df-co 4736  df-dm 4737  df-rn 4738  df-res 4739  df-ima 4740  df-iota 5288  df-fun 5330  df-fn 5331  df-f 5332  df-f1 5333  df-fo 5334  df-f1o 5335  df-fv 5336  df-riota 5976  df-ov 6026  df-oprab 6027  df-mpo 6028  df-1st 6308  df-2nd 6309  df-map 6824  df-pnf 8221  df-mnf 8222  df-ltxr 8224  df-inn 9149  df-2 9207  df-3 9208  df-ndx 13108  df-slot 13109  df-base 13111  df-sets 13112  df-iress 13113  df-plusg 13196  df-mulr 13197  df-0g 13364  df-mgm 13462  df-sgrp 13508  df-mnd 13523  df-mhm 13565  df-submnd 13566  df-grp 13609  df-subg 13780  df-ghm 13851  df-mgp 13958  df-ur 13997  df-ring 14035  df-rhm 14190  df-subrg 14257

This theorem is referenced by: (None)