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Theorem mplmapghm 22105

Description: The function 𝐻 mapping polynomials 𝑝 to their coefficient given a bag of variables 𝐹 is a group homomorphism. (Contributed by SN, 15-Mar-2025.)

**Hypotheses**
Ref	Expression
mplmapghm.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
mplmapghm.b	⊢ 𝐵 = (Base‘𝑃)
mplmapghm.d	⊢ 𝐷 = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
mplmapghm.h	⊢ 𝐻 = (𝑝 ∈ 𝐵 ↦ (𝑝‘𝐹))
mplmapghm.i	⊢ (𝜑 → 𝐼 ∈ 𝑉)
mplmapghm.r	⊢ (𝜑 → 𝑅 ∈ Grp)
mplmapghm.f	⊢ (𝜑 → 𝐹 ∈ 𝐷)

**Assertion**
Ref	Expression
mplmapghm	⊢ (𝜑 → 𝐻 ∈ (𝑃 GrpHom 𝑅))

Distinct variable groups: 𝐵,𝑝 𝑓,𝐼 𝑅,𝑝 𝜑,𝑝 𝑃,𝑝 𝐹,𝑝 Allowed substitution hints: 𝜑(𝑓) 𝐵(𝑓) 𝐷(𝑓,𝑝) 𝑃(𝑓) 𝑅(𝑓) 𝐹(𝑓) 𝐻(𝑓,𝑝) 𝐼(𝑝) 𝑉(𝑓,𝑝)

Proof of Theorem mplmapghm Dummy variables 𝑞 𝑟 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		mplmapghm.b	. 2 ⊢ 𝐵 = (Base‘𝑃)
2		eqid 2740	. 2 ⊢ (Base‘𝑅) = (Base‘𝑅)
3		eqid 2740	. 2 ⊢ (+_g‘𝑃) = (+_g‘𝑃)
4		eqid 2740	. 2 ⊢ (+_g‘𝑅) = (+_g‘𝑅)
5		mplmapghm.i	. . 3 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
6		mplmapghm.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Grp)
7		mplmapghm.p	. . . 4 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
8	7	mplgrp 21998	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑅 ∈ Grp) → 𝑃 ∈ Grp)
9	5, 6, 8	syl2anc 590	. 2 ⊢ (𝜑 → 𝑃 ∈ Grp)
10		mplmapghm.d	. . . . 5 ⊢ 𝐷 = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
11		simpr 485	. . . . 5 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝑝 ∈ 𝐵)
12	7, 2, 1, 10, 11	mplelf 21979	. . . 4 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝑝:𝐷⟶(Base‘𝑅))
13		mplmapghm.f	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ 𝐷)
14	13	adantr 481	. . . 4 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝐹 ∈ 𝐷)
15	12, 14	ffvelcdmd 7033	. . 3 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → (𝑝‘𝐹) ∈ (Base‘𝑅))
16		mplmapghm.h	. . 3 ⊢ 𝐻 = (𝑝 ∈ 𝐵 ↦ (𝑝‘𝐹))
17	15, 16	fmptd 7062	. 2 ⊢ (𝜑 → 𝐻:𝐵⟶(Base‘𝑅))
18		simprl 776	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞 ∈ 𝐵)
19		simprr 778	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟 ∈ 𝐵)
20	7, 1, 4, 3, 18, 19	mpladd 21990	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞(+_g‘𝑃)𝑟) = (𝑞 ∘_f (+_g‘𝑅)𝑟))
21	20	fveq1d 6836	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) = ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹))
22	7, 2, 1, 10, 18	mplelf 21979	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞:𝐷⟶(Base‘𝑅))
23	22	ffnd 6663	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞 Fn 𝐷)
24	7, 2, 1, 10, 19	mplelf 21979	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟:𝐷⟶(Base‘𝑅))
25	24	ffnd 6663	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟 Fn 𝐷)
26		ovex 7396	. . . . . . . 8 ⊢ (ℕ₀ ↑_m 𝐼) ∈ V
27	10, 26	rabex2 5276	. . . . . . 7 ⊢ 𝐷 ∈ V
28	27	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝐷 ∈ V)
29		inidm 4162	. . . . . 6 ⊢ (𝐷 ∩ 𝐷) = 𝐷
30		eqidd 2741	. . . . . 6 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → (𝑞‘𝐹) = (𝑞‘𝐹))
31		eqidd 2741	. . . . . 6 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → (𝑟‘𝐹) = (𝑟‘𝐹))
32	23, 25, 28, 28, 29, 30, 31	ofval 7638	. . . . 5 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
33	13, 32	mpidan 695	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
34	21, 33	eqtrd 2775	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
35		fveq1 6833	. . . 4 ⊢ (𝑝 = (𝑞(+_g‘𝑃)𝑟) → (𝑝‘𝐹) = ((𝑞(+_g‘𝑃)𝑟)‘𝐹))
36	9	adantr 481	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑃 ∈ Grp)
37	1, 3, 36, 18, 19	grpcld 18921	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞(+_g‘𝑃)𝑟) ∈ 𝐵)
38		fvexd 6849	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) ∈ V)
39	16, 35, 37, 38	fvmptd3 6966	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘(𝑞(+_g‘𝑃)𝑟)) = ((𝑞(+_g‘𝑃)𝑟)‘𝐹))
40		fveq1 6833	. . . . 5 ⊢ (𝑝 = 𝑞 → (𝑝‘𝐹) = (𝑞‘𝐹))
41		fvexd 6849	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞‘𝐹) ∈ V)
42	16, 40, 18, 41	fvmptd3 6966	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘𝑞) = (𝑞‘𝐹))
43		fveq1 6833	. . . . 5 ⊢ (𝑝 = 𝑟 → (𝑝‘𝐹) = (𝑟‘𝐹))
44		fvexd 6849	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑟‘𝐹) ∈ V)
45	16, 43, 19, 44	fvmptd3 6966	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘𝑟) = (𝑟‘𝐹))
46	42, 45	oveq12d 7381	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝐻‘𝑞)(+_g‘𝑅)(𝐻‘𝑟)) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
47	34, 39, 46	3eqtr4d 2785	. 2 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘(𝑞(+_g‘𝑃)𝑟)) = ((𝐻‘𝑞)(+_g‘𝑅)(𝐻‘𝑟)))
48	1, 2, 3, 4, 9, 6, 17, 47	isghmd 19198	1 ⊢ (𝜑 → 𝐻 ∈ (𝑃 GrpHom 𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 396 = wceq 1547 ∈ wcel 2119 {crab 3392 Vcvv 3432 ↦ cmpt 5160 ^◡ccnv 5624 “ cima 5628 ‘cfv 6492 (class class class)co 7363 ∘_f cof 7625 ↑_m cmap 8770 Fincfn 8890 ℕcn 12172 ℕ₀cn0 12435 Basecbs 17177 +_gcplusg 17218 Grpcgrp 18907 GrpHom cghm 19185 mPoly cmpl 21888

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-10 2152 ax-11 2168 ax-12 2189 ax-ext 2712 ax-rep 5206 ax-sep 5225 ax-nul 5235 ax-pow 5301 ax-pr 5369 ax-un 7685 ax-cnex 11092 ax-resscn 11093 ax-1cn 11094 ax-icn 11095 ax-addcl 11096 ax-addrcl 11097 ax-mulcl 11098 ax-mulrcl 11099 ax-mulcom 11100 ax-addass 11101 ax-mulass 11102 ax-distr 11103 ax-i2m1 11104 ax-1ne0 11105 ax-1rid 11106 ax-rnegex 11107 ax-rrecex 11108 ax-cnre 11109 ax-pre-lttri 11110 ax-pre-lttrn 11111 ax-pre-ltadd 11112 ax-pre-mulgt0 11113

This theorem depends on definitions: df-bi 208 df-an 397 df-or 854 df-3or 1093 df-3an 1094 df-tru 1550 df-fal 1560 df-ex 1787 df-nf 1791 df-sb 2074 df-mo 2543 df-eu 2573 df-clab 2719 df-cleq 2732 df-clel 2815 df-nfc 2889 df-ne 2936 df-nel 3040 df-ral 3055 df-rex 3065 df-rmo 3345 df-reu 3346 df-rab 3393 df-v 3434 df-sbc 3731 df-csb 3839 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-pss 3910 df-nul 4269 df-if 4462 df-pw 4538 df-sn 4563 df-pr 4565 df-tp 4567 df-op 4569 df-uni 4846 df-iun 4930 df-br 5080 df-opab 5142 df-mpt 5161 df-tr 5187 df-id 5520 df-eprel 5525 df-po 5533 df-so 5534 df-fr 5578 df-we 5580 df-xp 5631 df-rel 5632 df-cnv 5633 df-co 5634 df-dm 5635 df-rn 5636 df-res 5637 df-ima 5638 df-pred 6259 df-ord 6320 df-on 6321 df-lim 6322 df-suc 6323 df-iota 6448 df-fun 6494 df-fn 6495 df-f 6496 df-f1 6497 df-fo 6498 df-f1o 6499 df-fv 6500 df-riota 7320 df-ov 7366 df-oprab 7367 df-mpo 7368 df-of 7627 df-om 7814 df-1st 7938 df-2nd 7939 df-supp 8108 df-frecs 8228 df-wrecs 8259 df-recs 8308 df-rdg 8346 df-1o 8402 df-er 8640 df-map 8772 df-ixp 8843 df-en 8891 df-dom 8892 df-sdom 8893 df-fin 8894 df-fsupp 9272 df-sup 9352 df-pnf 11179 df-mnf 11180 df-xr 11181 df-ltxr 11182 df-le 11183 df-sub 11377 df-neg 11378 df-nn 12173 df-2 12242 df-3 12243 df-4 12244 df-5 12245 df-6 12246 df-7 12247 df-8 12248 df-9 12249 df-n0 12436 df-z 12523 df-dec 12643 df-uz 12787 df-fz 13460 df-struct 17115 df-sets 17132 df-slot 17150 df-ndx 17162 df-base 17178 df-ress 17199 df-plusg 17231 df-mulr 17232 df-sca 17234 df-vsca 17235 df-ip 17236 df-tset 17237 df-ple 17238 df-ds 17240 df-hom 17242 df-cco 17243 df-0g 17402 df-prds 17408 df-pws 17410 df-mgm 18606 df-sgrp 18685 df-mnd 18701 df-grp 18910 df-minusg 18911 df-subg 19097 df-ghm 19186 df-psr 21891 df-mpl 21893

This theorem is referenced by: selvvvval 22125 evlselv 43046

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