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Theorem mplcoe2 22048

Description: Decompose a monomial into a finite product of powers of variables. (The assumption that 𝑅 is a commutative ring is not strictly necessary, because the submonoid of monomials is in the center of the multiplicative monoid of polynomials, but it simplifies the proof.) (Contributed by Mario Carneiro, 10-Jan-2015.) (Proof shortened by AV, 18-Oct-2019.)

**Hypotheses**
Ref	Expression
mplcoe1.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
mplcoe1.d	⊢ 𝐷 = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
mplcoe1.z	⊢ 0 = (0_g‘𝑅)
mplcoe1.o	⊢ 1 = (1_r‘𝑅)
mplcoe1.i	⊢ (𝜑 → 𝐼 ∈ 𝑊)
mplcoe2.g	⊢ 𝐺 = (mulGrp‘𝑃)
mplcoe2.m	⊢ ↑ = (._g‘𝐺)
mplcoe2.v	⊢ 𝑉 = (𝐼 mVar 𝑅)
mplcoe2.r	⊢ (𝜑 → 𝑅 ∈ CRing)
mplcoe2.y	⊢ (𝜑 → 𝑌 ∈ 𝐷)

**Assertion**
Ref	Expression
mplcoe2	⊢ (𝜑 → (𝑦 ∈ 𝐷 ↦ if(𝑦 = 𝑌, 1 , 0 )) = (𝐺 Σ_g (𝑘 ∈ 𝐼 ↦ ((𝑌‘𝑘) ↑ (𝑉‘𝑘)))))

Distinct variable groups: ↑ ,𝑘,𝑦 1 ,𝑘,𝑦 𝑘,𝐺 𝑓,𝑘,𝑦,𝐼 𝜑,𝑘,𝑦 𝑅,𝑓,𝑦 𝐷,𝑘,𝑦 𝑃,𝑘 𝑘,𝑉 0 ,𝑓,𝑘,𝑦 𝑓,𝑌,𝑘,𝑦 𝑘,𝑊,𝑦 𝑦,𝐺 𝑦,𝑉 𝑦, ↑ Allowed substitution hints: 𝜑(𝑓) 𝐷(𝑓) 𝑃(𝑦,𝑓) 𝑅(𝑘) 1 (𝑓) ↑ (𝑓) 𝐺(𝑓) 𝑉(𝑓) 𝑊(𝑓)

Proof of Theorem mplcoe2 Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		mplcoe1.p	. 2 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
2		mplcoe1.d	. 2 ⊢ 𝐷 = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
3		mplcoe1.z	. 2 ⊢ 0 = (0_g‘𝑅)
4		mplcoe1.o	. 2 ⊢ 1 = (1_r‘𝑅)
5		mplcoe1.i	. 2 ⊢ (𝜑 → 𝐼 ∈ 𝑊)
6		mplcoe2.g	. 2 ⊢ 𝐺 = (mulGrp‘𝑃)
7		mplcoe2.m	. 2 ⊢ ↑ = (._g‘𝐺)
8		mplcoe2.v	. 2 ⊢ 𝑉 = (𝐼 mVar 𝑅)
9		mplcoe2.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ CRing)
10		crngring 20228	. . 3 ⊢ (𝑅 ∈ CRing → 𝑅 ∈ Ring)
11	9, 10	syl 17	. 2 ⊢ (𝜑 → 𝑅 ∈ Ring)
12		mplcoe2.y	. 2 ⊢ (𝜑 → 𝑌 ∈ 𝐷)
13	1	mplcrng 22030	. . . . . 6 ⊢ ((𝐼 ∈ 𝑊 ∧ 𝑅 ∈ CRing) → 𝑃 ∈ CRing)
14	5, 9, 13	syl2anc 582	. . . . 5 ⊢ (𝜑 → 𝑃 ∈ CRing)
15	14	adantr 479	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → 𝑃 ∈ CRing)
16		eqid 2726	. . . . 5 ⊢ (Base‘𝑃) = (Base‘𝑃)
17	5	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → 𝐼 ∈ 𝑊)
18	11	adantr 479	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → 𝑅 ∈ Ring)
19		simprr 771	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → 𝑦 ∈ 𝐼)
20	1, 8, 16, 17, 18, 19	mvrcl 22001	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → (𝑉‘𝑦) ∈ (Base‘𝑃))
21		simprl 769	. . . . 5 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → 𝑥 ∈ 𝐼)
22	1, 8, 16, 17, 18, 21	mvrcl 22001	. . . 4 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → (𝑉‘𝑥) ∈ (Base‘𝑃))
23		eqid 2726	. . . . . . 7 ⊢ (._r‘𝑃) = (._r‘𝑃)
24	6, 23	mgpplusg 20121	. . . . . 6 ⊢ (._r‘𝑃) = (+_g‘𝐺)
25	24	eqcomi 2735	. . . . 5 ⊢ (+_g‘𝐺) = (._r‘𝑃)
26	16, 25	crngcom 20234	. . . 4 ⊢ ((𝑃 ∈ CRing ∧ (𝑉‘𝑦) ∈ (Base‘𝑃) ∧ (𝑉‘𝑥) ∈ (Base‘𝑃)) → ((𝑉‘𝑦)(+_g‘𝐺)(𝑉‘𝑥)) = ((𝑉‘𝑥)(+_g‘𝐺)(𝑉‘𝑦)))
27	15, 20, 22, 26	syl3anc 1368	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐼 ∧ 𝑦 ∈ 𝐼)) → ((𝑉‘𝑦)(+_g‘𝐺)(𝑉‘𝑥)) = ((𝑉‘𝑥)(+_g‘𝐺)(𝑉‘𝑦)))
28	27	ralrimivva 3191	. 2 ⊢ (𝜑 → ∀𝑥 ∈ 𝐼 ∀𝑦 ∈ 𝐼 ((𝑉‘𝑦)(+_g‘𝐺)(𝑉‘𝑥)) = ((𝑉‘𝑥)(+_g‘𝐺)(𝑉‘𝑦)))
29	1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 28	mplcoe5 22047	1 ⊢ (𝜑 → (𝑦 ∈ 𝐷 ↦ if(𝑦 = 𝑌, 1 , 0 )) = (𝐺 Σ_g (𝑘 ∈ 𝐼 ↦ ((𝑌‘𝑘) ↑ (𝑉‘𝑘)))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 394 = wceq 1534 ∈ wcel 2099 {crab 3419 ifcif 4533 ↦ cmpt 5236 ^◡ccnv 5681 “ cima 5685 ‘cfv 6554 (class class class)co 7424 ↑_m cmap 8855 Fincfn 8974 ℕcn 12264 ℕ₀cn0 12524 Basecbs 17213 +_gcplusg 17266 ._rcmulr 17267 0_gc0g 17454 Σ_g cgsu 17455 ._gcmg 19061 mulGrpcmgp 20117 1_rcur 20164 Ringcrg 20216 CRingccrg 20217 mVar cmvr 21902 mPoly cmpl 21903

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1790 ax-4 1804 ax-5 1906 ax-6 1964 ax-7 2004 ax-8 2101 ax-9 2109 ax-10 2130 ax-11 2147 ax-12 2167 ax-ext 2697 ax-rep 5290 ax-sep 5304 ax-nul 5311 ax-pow 5369 ax-pr 5433 ax-un 7746 ax-cnex 11214 ax-resscn 11215 ax-1cn 11216 ax-icn 11217 ax-addcl 11218 ax-addrcl 11219 ax-mulcl 11220 ax-mulrcl 11221 ax-mulcom 11222 ax-addass 11223 ax-mulass 11224 ax-distr 11225 ax-i2m1 11226 ax-1ne0 11227 ax-1rid 11228 ax-rnegex 11229 ax-rrecex 11230 ax-cnre 11231 ax-pre-lttri 11232 ax-pre-lttrn 11233 ax-pre-ltadd 11234 ax-pre-mulgt0 11235

This theorem depends on definitions: df-bi 206 df-an 395 df-or 846 df-3or 1085 df-3an 1086 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2529 df-eu 2558 df-clab 2704 df-cleq 2718 df-clel 2803 df-nfc 2878 df-ne 2931 df-nel 3037 df-ral 3052 df-rex 3061 df-rmo 3364 df-reu 3365 df-rab 3420 df-v 3464 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3967 df-nul 4326 df-if 4534 df-pw 4609 df-sn 4634 df-pr 4636 df-tp 4638 df-op 4640 df-uni 4914 df-int 4955 df-iun 5003 df-iin 5004 df-br 5154 df-opab 5216 df-mpt 5237 df-tr 5271 df-id 5580 df-eprel 5586 df-po 5594 df-so 5595 df-fr 5637 df-se 5638 df-we 5639 df-xp 5688 df-rel 5689 df-cnv 5690 df-co 5691 df-dm 5692 df-rn 5693 df-res 5694 df-ima 5695 df-pred 6312 df-ord 6379 df-on 6380 df-lim 6381 df-suc 6382 df-iota 6506 df-fun 6556 df-fn 6557 df-f 6558 df-f1 6559 df-fo 6560 df-f1o 6561 df-fv 6562 df-isom 6563 df-riota 7380 df-ov 7427 df-oprab 7428 df-mpo 7429 df-of 7690 df-ofr 7691 df-om 7877 df-1st 8003 df-2nd 8004 df-supp 8175 df-frecs 8296 df-wrecs 8327 df-recs 8401 df-rdg 8440 df-1o 8496 df-2o 8497 df-er 8734 df-map 8857 df-pm 8858 df-ixp 8927 df-en 8975 df-dom 8976 df-sdom 8977 df-fin 8978 df-fsupp 9406 df-sup 9485 df-oi 9553 df-card 9982 df-pnf 11300 df-mnf 11301 df-xr 11302 df-ltxr 11303 df-le 11304 df-sub 11496 df-neg 11497 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 12611 df-dec 12730 df-uz 12875 df-fz 13539 df-fzo 13682 df-seq 14022 df-hash 14348 df-struct 17149 df-sets 17166 df-slot 17184 df-ndx 17196 df-base 17214 df-ress 17243 df-plusg 17279 df-mulr 17280 df-sca 17282 df-vsca 17283 df-ip 17284 df-tset 17285 df-ple 17286 df-ds 17288 df-hom 17290 df-cco 17291 df-0g 17456 df-gsum 17457 df-prds 17462 df-pws 17464 df-mre 17599 df-mrc 17600 df-acs 17602 df-mgm 18633 df-sgrp 18712 df-mnd 18728 df-mhm 18773 df-submnd 18774 df-grp 18931 df-minusg 18932 df-mulg 19062 df-subg 19117 df-ghm 19207 df-cntz 19311 df-cmn 19780 df-abl 19781 df-mgp 20118 df-rng 20136 df-ur 20165 df-srg 20170 df-ring 20218 df-cring 20219 df-subrng 20528 df-subrg 20553 df-psr 21906 df-mvr 21907 df-mpl 21908

This theorem is referenced by: mplbas2 22049 selvvvval 42057

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