subrgascl - Metamath Proof Explorer

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Theorem subrgascl 22108

Description: The scalar injection function in a subring algebra is the same up to a restriction to the subring. (Contributed by Mario Carneiro, 4-Jul-2015.)

**Hypotheses**
Ref	Expression
subrgascl.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
subrgascl.a	⊢ 𝐴 = (algSc‘𝑃)
subrgascl.h	⊢ 𝐻 = (𝑅 ↾_s 𝑇)
subrgascl.u	⊢ 𝑈 = (𝐼 mPoly 𝐻)
subrgascl.i	⊢ (𝜑 → 𝐼 ∈ 𝑊)
subrgascl.r	⊢ (𝜑 → 𝑇 ∈ (SubRing‘𝑅))
subrgascl.c	⊢ 𝐶 = (algSc‘𝑈)

**Assertion**
Ref	Expression
subrgascl	⊢ (𝜑 → 𝐶 = (𝐴 ↾ 𝑇))

Proof of Theorem subrgascl Dummy variables 𝑥 𝑓 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		subrgascl.c	. . . 4 ⊢ 𝐶 = (algSc‘𝑈)
2		eqid 2735	. . . 4 ⊢ (Scalar‘𝑈) = (Scalar‘𝑈)
3		eqid 2735	. . . 4 ⊢ (Base‘(Scalar‘𝑈)) = (Base‘(Scalar‘𝑈))
4	1, 2, 3	asclfn 21919	. . 3 ⊢ 𝐶 Fn (Base‘(Scalar‘𝑈))
5		subrgascl.r	. . . . . 6 ⊢ (𝜑 → 𝑇 ∈ (SubRing‘𝑅))
6		subrgascl.h	. . . . . . 7 ⊢ 𝐻 = (𝑅 ↾_s 𝑇)
7	6	subrgbas 20598	. . . . . 6 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝑇 = (Base‘𝐻))
8	5, 7	syl 17	. . . . 5 ⊢ (𝜑 → 𝑇 = (Base‘𝐻))
9		subrgascl.u	. . . . . . 7 ⊢ 𝑈 = (𝐼 mPoly 𝐻)
10		subrgascl.i	. . . . . . 7 ⊢ (𝜑 → 𝐼 ∈ 𝑊)
11	6	ovexi 7465	. . . . . . . 8 ⊢ 𝐻 ∈ V
12	11	a1i 11	. . . . . . 7 ⊢ (𝜑 → 𝐻 ∈ V)
13	9, 10, 12	mplsca 22051	. . . . . 6 ⊢ (𝜑 → 𝐻 = (Scalar‘𝑈))
14	13	fveq2d 6911	. . . . 5 ⊢ (𝜑 → (Base‘𝐻) = (Base‘(Scalar‘𝑈)))
15	8, 14	eqtrd 2775	. . . 4 ⊢ (𝜑 → 𝑇 = (Base‘(Scalar‘𝑈)))
16	15	fneq2d 6663	. . 3 ⊢ (𝜑 → (𝐶 Fn 𝑇 ↔ 𝐶 Fn (Base‘(Scalar‘𝑈))))
17	4, 16	mpbiri 258	. 2 ⊢ (𝜑 → 𝐶 Fn 𝑇)
18		subrgascl.a	. . . . 5 ⊢ 𝐴 = (algSc‘𝑃)
19		eqid 2735	. . . . 5 ⊢ (Scalar‘𝑃) = (Scalar‘𝑃)
20		eqid 2735	. . . . 5 ⊢ (Base‘(Scalar‘𝑃)) = (Base‘(Scalar‘𝑃))
21	18, 19, 20	asclfn 21919	. . . 4 ⊢ 𝐴 Fn (Base‘(Scalar‘𝑃))
22		subrgascl.p	. . . . . . 7 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
23		subrgrcl 20593	. . . . . . . 8 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝑅 ∈ Ring)
24	5, 23	syl 17	. . . . . . 7 ⊢ (𝜑 → 𝑅 ∈ Ring)
25	22, 10, 24	mplsca 22051	. . . . . 6 ⊢ (𝜑 → 𝑅 = (Scalar‘𝑃))
26	25	fveq2d 6911	. . . . 5 ⊢ (𝜑 → (Base‘𝑅) = (Base‘(Scalar‘𝑃)))
27	26	fneq2d 6663	. . . 4 ⊢ (𝜑 → (𝐴 Fn (Base‘𝑅) ↔ 𝐴 Fn (Base‘(Scalar‘𝑃))))
28	21, 27	mpbiri 258	. . 3 ⊢ (𝜑 → 𝐴 Fn (Base‘𝑅))
29		eqid 2735	. . . . 5 ⊢ (Base‘𝑅) = (Base‘𝑅)
30	29	subrgss 20589	. . . 4 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝑇 ⊆ (Base‘𝑅))
31	5, 30	syl 17	. . 3 ⊢ (𝜑 → 𝑇 ⊆ (Base‘𝑅))
32		fnssres 6692	. . 3 ⊢ ((𝐴 Fn (Base‘𝑅) ∧ 𝑇 ⊆ (Base‘𝑅)) → (𝐴 ↾ 𝑇) Fn 𝑇)
33	28, 31, 32	syl2anc 584	. 2 ⊢ (𝜑 → (𝐴 ↾ 𝑇) Fn 𝑇)
34		fvres 6926	. . . 4 ⊢ (𝑥 ∈ 𝑇 → ((𝐴 ↾ 𝑇)‘𝑥) = (𝐴‘𝑥))
35	34	adantl 481	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → ((𝐴 ↾ 𝑇)‘𝑥) = (𝐴‘𝑥))
36		eqid 2735	. . . . . . . . 9 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
37	6, 36	subrg0 20596	. . . . . . . 8 ⊢ (𝑇 ∈ (SubRing‘𝑅) → (0_g‘𝑅) = (0_g‘𝐻))
38	5, 37	syl 17	. . . . . . 7 ⊢ (𝜑 → (0_g‘𝑅) = (0_g‘𝐻))
39	38	ifeq2d 4551	. . . . . 6 ⊢ (𝜑 → if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝑅)) = if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝐻)))
40	39	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝑅)) = if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝐻)))
41	40	mpteq2dv 5250	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝑦 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝑅))) = (𝑦 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝐻))))
42		eqid 2735	. . . . 5 ⊢ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
43	10	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → 𝐼 ∈ 𝑊)
44	24	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → 𝑅 ∈ Ring)
45	31	sselda 3995	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → 𝑥 ∈ (Base‘𝑅))
46	22, 42, 36, 29, 18, 43, 44, 45	mplascl 22106	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝐴‘𝑥) = (𝑦 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝑅))))
47		eqid 2735	. . . . 5 ⊢ (0_g‘𝐻) = (0_g‘𝐻)
48		eqid 2735	. . . . 5 ⊢ (Base‘𝐻) = (Base‘𝐻)
49	6	subrgring 20591	. . . . . . 7 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝐻 ∈ Ring)
50	5, 49	syl 17	. . . . . 6 ⊢ (𝜑 → 𝐻 ∈ Ring)
51	50	adantr 480	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → 𝐻 ∈ Ring)
52	8	eleq2d 2825	. . . . . 6 ⊢ (𝜑 → (𝑥 ∈ 𝑇 ↔ 𝑥 ∈ (Base‘𝐻)))
53	52	biimpa 476	. . . . 5 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → 𝑥 ∈ (Base‘𝐻))
54	9, 42, 47, 48, 1, 43, 51, 53	mplascl 22106	. . . 4 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝐶‘𝑥) = (𝑦 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑦 = (𝐼 × {0}), 𝑥, (0_g‘𝐻))))
55	41, 46, 54	3eqtr4d 2785	. . 3 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝐴‘𝑥) = (𝐶‘𝑥))
56	35, 55	eqtr2d 2776	. 2 ⊢ ((𝜑 ∧ 𝑥 ∈ 𝑇) → (𝐶‘𝑥) = ((𝐴 ↾ 𝑇)‘𝑥))
57	17, 33, 56	eqfnfvd 7054	1 ⊢ (𝜑 → 𝐶 = (𝐴 ↾ 𝑇))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1537 ∈ wcel 2106 {crab 3433 Vcvv 3478 ⊆ wss 3963 ifcif 4531 {csn 4631 ↦ cmpt 5231 × cxp 5687 ^◡ccnv 5688 ↾ cres 5691 “ cima 5692 Fn wfn 6558 ‘cfv 6563 (class class class)co 7431 ↑_m cmap 8865 Fincfn 8984 0cc0 11153 ℕcn 12264 ℕ₀cn0 12524 Basecbs 17245 ↾_s cress 17274 Scalarcsca 17301 0_gc0g 17486 Ringcrg 20251 SubRingcsubrg 20586 algSccascl 21890 mPoly cmpl 21944

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1908 ax-6 1965 ax-7 2005 ax-8 2108 ax-9 2116 ax-10 2139 ax-11 2155 ax-12 2175 ax-ext 2706 ax-rep 5285 ax-sep 5302 ax-nul 5312 ax-pow 5371 ax-pr 5438 ax-un 7754 ax-cnex 11209 ax-resscn 11210 ax-1cn 11211 ax-icn 11212 ax-addcl 11213 ax-addrcl 11214 ax-mulcl 11215 ax-mulrcl 11216 ax-mulcom 11217 ax-addass 11218 ax-mulass 11219 ax-distr 11220 ax-i2m1 11221 ax-1ne0 11222 ax-1rid 11223 ax-rnegex 11224 ax-rrecex 11225 ax-cnre 11226 ax-pre-lttri 11227 ax-pre-lttrn 11228 ax-pre-ltadd 11229 ax-pre-mulgt0 11230

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1540 df-fal 1550 df-ex 1777 df-nf 1781 df-sb 2063 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2727 df-clel 2814 df-nfc 2890 df-ne 2939 df-nel 3045 df-ral 3060 df-rex 3069 df-rmo 3378 df-reu 3379 df-rab 3434 df-v 3480 df-sbc 3792 df-csb 3909 df-dif 3966 df-un 3968 df-in 3970 df-ss 3980 df-pss 3983 df-nul 4340 df-if 4532 df-pw 4607 df-sn 4632 df-pr 4634 df-tp 4636 df-op 4638 df-uni 4913 df-int 4952 df-iun 4998 df-iin 4999 df-br 5149 df-opab 5211 df-mpt 5232 df-tr 5266 df-id 5583 df-eprel 5589 df-po 5597 df-so 5598 df-fr 5641 df-se 5642 df-we 5643 df-xp 5695 df-rel 5696 df-cnv 5697 df-co 5698 df-dm 5699 df-rn 5700 df-res 5701 df-ima 5702 df-pred 6323 df-ord 6389 df-on 6390 df-lim 6391 df-suc 6392 df-iota 6516 df-fun 6565 df-fn 6566 df-f 6567 df-f1 6568 df-fo 6569 df-f1o 6570 df-fv 6571 df-isom 6572 df-riota 7388 df-ov 7434 df-oprab 7435 df-mpo 7436 df-of 7697 df-ofr 7698 df-om 7888 df-1st 8013 df-2nd 8014 df-supp 8185 df-frecs 8305 df-wrecs 8336 df-recs 8410 df-rdg 8449 df-1o 8505 df-2o 8506 df-er 8744 df-map 8867 df-pm 8868 df-ixp 8937 df-en 8985 df-dom 8986 df-sdom 8987 df-fin 8988 df-fsupp 9400 df-sup 9480 df-oi 9548 df-card 9977 df-pnf 11295 df-mnf 11296 df-xr 11297 df-ltxr 11298 df-le 11299 df-sub 11492 df-neg 11493 df-nn 12265 df-2 12327 df-3 12328 df-4 12329 df-5 12330 df-6 12331 df-7 12332 df-8 12333 df-9 12334 df-n0 12525 df-z 12612 df-dec 12732 df-uz 12877 df-fz 13545 df-fzo 13692 df-seq 14040 df-hash 14367 df-struct 17181 df-sets 17198 df-slot 17216 df-ndx 17228 df-base 17246 df-ress 17275 df-plusg 17311 df-mulr 17312 df-sca 17314 df-vsca 17315 df-ip 17316 df-tset 17317 df-ple 17318 df-ds 17320 df-hom 17322 df-cco 17323 df-0g 17488 df-gsum 17489 df-prds 17494 df-pws 17496 df-mre 17631 df-mrc 17632 df-acs 17634 df-mgm 18666 df-sgrp 18745 df-mnd 18761 df-mhm 18809 df-submnd 18810 df-grp 18967 df-minusg 18968 df-mulg 19099 df-subg 19154 df-ghm 19244 df-cntz 19348 df-cmn 19815 df-abl 19816 df-mgp 20153 df-rng 20171 df-ur 20200 df-ring 20253 df-subrng 20563 df-subrg 20587 df-ascl 21893 df-psr 21947 df-mpl 21949

This theorem is referenced by: subrgasclcl 22109 subrg1ascl 22278

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