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Theorem subrgasclcl 21619

Description: The scalars in a polynomial algebra are in the subring algebra iff the scalar value is in 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))
subrgasclcl.b	⊢ 𝐵 = (Base‘𝑈)
subrgasclcl.k	⊢ 𝐾 = (Base‘𝑅)
subrgasclcl.x	⊢ (𝜑 → 𝑋 ∈ 𝐾)

**Assertion**
Ref	Expression
subrgasclcl	⊢ (𝜑 → ((𝐴‘𝑋) ∈ 𝐵 ↔ 𝑋 ∈ 𝑇))

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

Step	Hyp	Ref	Expression
1		iftrue 4533	. . . . 5 ⊢ (𝑥 = (𝐼 × {0}) → if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅)) = 𝑋)
2	1	eleq1d 2818	. . . 4 ⊢ (𝑥 = (𝐼 × {0}) → (if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅)) ∈ (Base‘𝐻) ↔ 𝑋 ∈ (Base‘𝐻)))
3		eqid 2732	. . . . . 6 ⊢ (𝐼 mPwSer 𝐻) = (𝐼 mPwSer 𝐻)
4		eqid 2732	. . . . . 6 ⊢ (Base‘𝐻) = (Base‘𝐻)
5		eqid 2732	. . . . . 6 ⊢ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
6		eqid 2732	. . . . . 6 ⊢ (Base‘(𝐼 mPwSer 𝐻)) = (Base‘(𝐼 mPwSer 𝐻))
7		subrgascl.p	. . . . . . . . 9 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
8		eqid 2732	. . . . . . . . 9 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
9		subrgasclcl.k	. . . . . . . . 9 ⊢ 𝐾 = (Base‘𝑅)
10		subrgascl.a	. . . . . . . . 9 ⊢ 𝐴 = (algSc‘𝑃)
11		subrgascl.i	. . . . . . . . 9 ⊢ (𝜑 → 𝐼 ∈ 𝑊)
12		subrgascl.r	. . . . . . . . . 10 ⊢ (𝜑 → 𝑇 ∈ (SubRing‘𝑅))
13		subrgrcl 20360	. . . . . . . . . 10 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝑅 ∈ Ring)
14	12, 13	syl 17	. . . . . . . . 9 ⊢ (𝜑 → 𝑅 ∈ Ring)
15		subrgasclcl.x	. . . . . . . . 9 ⊢ (𝜑 → 𝑋 ∈ 𝐾)
16	7, 5, 8, 9, 10, 11, 14, 15	mplascl 21616	. . . . . . . 8 ⊢ (𝜑 → (𝐴‘𝑋) = (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))))
17	16	adantr 481	. . . . . . 7 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → (𝐴‘𝑋) = (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))))
18		subrgascl.u	. . . . . . . . . 10 ⊢ 𝑈 = (𝐼 mPoly 𝐻)
19		subrgasclcl.b	. . . . . . . . . 10 ⊢ 𝐵 = (Base‘𝑈)
20		subrgascl.h	. . . . . . . . . . . 12 ⊢ 𝐻 = (𝑅 ↾_s 𝑇)
21	20	subrgring 20358	. . . . . . . . . . 11 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝐻 ∈ Ring)
22	12, 21	syl 17	. . . . . . . . . 10 ⊢ (𝜑 → 𝐻 ∈ Ring)
23	3, 18, 19, 11, 22	mplsubrg 21555	. . . . . . . . 9 ⊢ (𝜑 → 𝐵 ∈ (SubRing‘(𝐼 mPwSer 𝐻)))
24	6	subrgss 20356	. . . . . . . . 9 ⊢ (𝐵 ∈ (SubRing‘(𝐼 mPwSer 𝐻)) → 𝐵 ⊆ (Base‘(𝐼 mPwSer 𝐻)))
25	23, 24	syl 17	. . . . . . . 8 ⊢ (𝜑 → 𝐵 ⊆ (Base‘(𝐼 mPwSer 𝐻)))
26	25	sselda 3981	. . . . . . 7 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → (𝐴‘𝑋) ∈ (Base‘(𝐼 mPwSer 𝐻)))
27	17, 26	eqeltrrd 2834	. . . . . 6 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))) ∈ (Base‘(𝐼 mPwSer 𝐻)))
28	3, 4, 5, 6, 27	psrelbas 21489	. . . . 5 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))):{𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}⟶(Base‘𝐻))
29		eqid 2732	. . . . . 6 ⊢ (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))) = (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅)))
30	29	fmpt 7106	. . . . 5 ⊢ (∀𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅)) ∈ (Base‘𝐻) ↔ (𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ↦ if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅))):{𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}⟶(Base‘𝐻))
31	28, 30	sylibr 233	. . . 4 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → ∀𝑥 ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}if(𝑥 = (𝐼 × {0}), 𝑋, (0_g‘𝑅)) ∈ (Base‘𝐻))
32	11	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → 𝐼 ∈ 𝑊)
33	5	psrbag0 21614	. . . . 5 ⊢ (𝐼 ∈ 𝑊 → (𝐼 × {0}) ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin})
34	32, 33	syl 17	. . . 4 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → (𝐼 × {0}) ∈ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin})
35	2, 31, 34	rspcdva 3613	. . 3 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → 𝑋 ∈ (Base‘𝐻))
36	20	subrgbas 20364	. . . . 5 ⊢ (𝑇 ∈ (SubRing‘𝑅) → 𝑇 = (Base‘𝐻))
37	12, 36	syl 17	. . . 4 ⊢ (𝜑 → 𝑇 = (Base‘𝐻))
38	37	adantr 481	. . 3 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → 𝑇 = (Base‘𝐻))
39	35, 38	eleqtrrd 2836	. 2 ⊢ ((𝜑 ∧ (𝐴‘𝑋) ∈ 𝐵) → 𝑋 ∈ 𝑇)
40		eqid 2732	. . . . . 6 ⊢ (algSc‘𝑈) = (algSc‘𝑈)
41	7, 10, 20, 18, 11, 12, 40	subrgascl 21618	. . . . 5 ⊢ (𝜑 → (algSc‘𝑈) = (𝐴 ↾ 𝑇))
42	41	fveq1d 6890	. . . 4 ⊢ (𝜑 → ((algSc‘𝑈)‘𝑋) = ((𝐴 ↾ 𝑇)‘𝑋))
43		fvres 6907	. . . 4 ⊢ (𝑋 ∈ 𝑇 → ((𝐴 ↾ 𝑇)‘𝑋) = (𝐴‘𝑋))
44	42, 43	sylan9eq 2792	. . 3 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝑇) → ((algSc‘𝑈)‘𝑋) = (𝐴‘𝑋))
45		eqid 2732	. . . . . . 7 ⊢ (Scalar‘𝑈) = (Scalar‘𝑈)
46	18	mplring 21569	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑊 ∧ 𝐻 ∈ Ring) → 𝑈 ∈ Ring)
47	18	mpllmod 21568	. . . . . . 7 ⊢ ((𝐼 ∈ 𝑊 ∧ 𝐻 ∈ Ring) → 𝑈 ∈ LMod)
48		eqid 2732	. . . . . . 7 ⊢ (Base‘(Scalar‘𝑈)) = (Base‘(Scalar‘𝑈))
49	40, 45, 46, 47, 48, 19	asclf 21427	. . . . . 6 ⊢ ((𝐼 ∈ 𝑊 ∧ 𝐻 ∈ Ring) → (algSc‘𝑈):(Base‘(Scalar‘𝑈))⟶𝐵)
50	11, 22, 49	syl2anc 584	. . . . 5 ⊢ (𝜑 → (algSc‘𝑈):(Base‘(Scalar‘𝑈))⟶𝐵)
51	50	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝑇) → (algSc‘𝑈):(Base‘(Scalar‘𝑈))⟶𝐵)
52	18, 11, 22	mplsca 21563	. . . . . . . 8 ⊢ (𝜑 → 𝐻 = (Scalar‘𝑈))
53	52	fveq2d 6892	. . . . . . 7 ⊢ (𝜑 → (Base‘𝐻) = (Base‘(Scalar‘𝑈)))
54	37, 53	eqtrd 2772	. . . . . 6 ⊢ (𝜑 → 𝑇 = (Base‘(Scalar‘𝑈)))
55	54	eleq2d 2819	. . . . 5 ⊢ (𝜑 → (𝑋 ∈ 𝑇 ↔ 𝑋 ∈ (Base‘(Scalar‘𝑈))))
56	55	biimpa 477	. . . 4 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝑇) → 𝑋 ∈ (Base‘(Scalar‘𝑈)))
57	51, 56	ffvelcdmd 7084	. . 3 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝑇) → ((algSc‘𝑈)‘𝑋) ∈ 𝐵)
58	44, 57	eqeltrrd 2834	. 2 ⊢ ((𝜑 ∧ 𝑋 ∈ 𝑇) → (𝐴‘𝑋) ∈ 𝐵)
59	39, 58	impbida 799	1 ⊢ (𝜑 → ((𝐴‘𝑋) ∈ 𝐵 ↔ 𝑋 ∈ 𝑇))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 396 = wceq 1541 ∈ wcel 2106 ∀wral 3061 {crab 3432 ⊆ wss 3947 ifcif 4527 {csn 4627 ↦ cmpt 5230 × cxp 5673 ^◡ccnv 5674 ↾ cres 5677 “ cima 5678 ⟶wf 6536 ‘cfv 6540 (class class class)co 7405 ↑_m cmap 8816 Fincfn 8935 0cc0 11106 ℕcn 12208 ℕ₀cn0 12468 Basecbs 17140 ↾_s cress 17169 Scalarcsca 17196 0_gc0g 17381 Ringcrg 20049 SubRingcsubrg 20351 algSccascl 21398 mPwSer cmps 21448 mPoly cmpl 21450

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 2703 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7721 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

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 2534 df-eu 2563 df-clab 2710 df-cleq 2724 df-clel 2810 df-nfc 2885 df-ne 2941 df-nel 3047 df-ral 3062 df-rex 3071 df-rmo 3376 df-reu 3377 df-rab 3433 df-v 3476 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-iin 4999 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-se 5631 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-isom 6549 df-riota 7361 df-ov 7408 df-oprab 7409 df-mpo 7410 df-of 7666 df-ofr 7667 df-om 7852 df-1st 7971 df-2nd 7972 df-supp 8143 df-frecs 8262 df-wrecs 8293 df-recs 8367 df-rdg 8406 df-1o 8462 df-er 8699 df-map 8818 df-pm 8819 df-ixp 8888 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-fsupp 9358 df-sup 9433 df-oi 9501 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-3 12272 df-4 12273 df-5 12274 df-6 12275 df-7 12276 df-8 12277 df-9 12278 df-n0 12469 df-z 12555 df-dec 12674 df-uz 12819 df-fz 13481 df-fzo 13624 df-seq 13963 df-hash 14287 df-struct 17076 df-sets 17093 df-slot 17111 df-ndx 17123 df-base 17141 df-ress 17170 df-plusg 17206 df-mulr 17207 df-sca 17209 df-vsca 17210 df-ip 17211 df-tset 17212 df-ple 17213 df-ds 17215 df-hom 17217 df-cco 17218 df-0g 17383 df-gsum 17384 df-prds 17389 df-pws 17391 df-mre 17526 df-mrc 17527 df-acs 17529 df-mgm 18557 df-sgrp 18606 df-mnd 18622 df-mhm 18667 df-submnd 18668 df-grp 18818 df-minusg 18819 df-sbg 18820 df-mulg 18945 df-subg 18997 df-ghm 19084 df-cntz 19175 df-cmn 19644 df-abl 19645 df-mgp 19982 df-ur 19999 df-ring 20051 df-subrg 20353 df-lmod 20465 df-lss 20535 df-ascl 21401 df-psr 21453 df-mpl 21455

This theorem is referenced by: subrg1asclcl 21773

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