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Theorem mplmapghm 22155

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 2761	. 2 ⊢ (Base‘𝑅) = (Base‘𝑅)
3		eqid 2761	. 2 ⊢ (+_g‘𝑃) = (+_g‘𝑃)
4		eqid 2761	. 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 22048	. . 3 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑅 ∈ Grp) → 𝑃 ∈ Grp)
9	5, 6, 8	syl2anc 593	. 2 ⊢ (𝜑 → 𝑃 ∈ Grp)
10		mplmapghm.d	. . . . 5 ⊢ 𝐷 = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
11		simpr 488	. . . . 5 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝑝 ∈ 𝐵)
12	7, 2, 1, 10, 11	mplelf 22029	. . . 4 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝑝:𝐷⟶(Base‘𝑅))
13		mplmapghm.f	. . . . 5 ⊢ (𝜑 → 𝐹 ∈ 𝐷)
14	13	adantr 484	. . . 4 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → 𝐹 ∈ 𝐷)
15	12, 14	ffvelcdmd 7062	. . 3 ⊢ ((𝜑 ∧ 𝑝 ∈ 𝐵) → (𝑝‘𝐹) ∈ (Base‘𝑅))
16		mplmapghm.h	. . 3 ⊢ 𝐻 = (𝑝 ∈ 𝐵 ↦ (𝑝‘𝐹))
17	15, 16	fmptd 7091	. 2 ⊢ (𝜑 → 𝐻:𝐵⟶(Base‘𝑅))
18		simprl 780	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞 ∈ 𝐵)
19		simprr 782	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟 ∈ 𝐵)
20	7, 1, 4, 3, 18, 19	mpladd 22040	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞(+_g‘𝑃)𝑟) = (𝑞 ∘_f (+_g‘𝑅)𝑟))
21	20	fveq1d 6865	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) = ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹))
22	7, 2, 1, 10, 18	mplelf 22029	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞:𝐷⟶(Base‘𝑅))
23	22	ffnd 6688	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑞 Fn 𝐷)
24	7, 2, 1, 10, 19	mplelf 22029	. . . . . . 7 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟:𝐷⟶(Base‘𝑅))
25	24	ffnd 6688	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑟 Fn 𝐷)
26		ovex 7425	. . . . . . . 8 ⊢ (ℕ₀ ↑_m 𝐼) ∈ V
27	10, 26	rabex2 5296	. . . . . . 7 ⊢ 𝐷 ∈ V
28	27	a1i 11	. . . . . 6 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝐷 ∈ V)
29		inidm 4178	. . . . . 6 ⊢ (𝐷 ∩ 𝐷) = 𝐷
30		eqidd 2762	. . . . . 6 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → (𝑞‘𝐹) = (𝑞‘𝐹))
31		eqidd 2762	. . . . . 6 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → (𝑟‘𝐹) = (𝑟‘𝐹))
32	23, 25, 28, 28, 29, 30, 31	ofval 7667	. . . . 5 ⊢ (((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) ∧ 𝐹 ∈ 𝐷) → ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
33	13, 32	mpidan 699	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞 ∘_f (+_g‘𝑅)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
34	21, 33	eqtrd 2796	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
35		fveq1 6862	. . . 4 ⊢ (𝑝 = (𝑞(+_g‘𝑃)𝑟) → (𝑝‘𝐹) = ((𝑞(+_g‘𝑃)𝑟)‘𝐹))
36	9	adantr 484	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → 𝑃 ∈ Grp)
37	1, 3, 36, 18, 19	grpcld 18972	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞(+_g‘𝑃)𝑟) ∈ 𝐵)
38		fvexd 6878	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝑞(+_g‘𝑃)𝑟)‘𝐹) ∈ V)
39	16, 35, 37, 38	fvmptd3 6995	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘(𝑞(+_g‘𝑃)𝑟)) = ((𝑞(+_g‘𝑃)𝑟)‘𝐹))
40		fveq1 6862	. . . . 5 ⊢ (𝑝 = 𝑞 → (𝑝‘𝐹) = (𝑞‘𝐹))
41		fvexd 6878	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑞‘𝐹) ∈ V)
42	16, 40, 18, 41	fvmptd3 6995	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘𝑞) = (𝑞‘𝐹))
43		fveq1 6862	. . . . 5 ⊢ (𝑝 = 𝑟 → (𝑝‘𝐹) = (𝑟‘𝐹))
44		fvexd 6878	. . . . 5 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝑟‘𝐹) ∈ V)
45	16, 43, 19, 44	fvmptd3 6995	. . . 4 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → (𝐻‘𝑟) = (𝑟‘𝐹))
46	42, 45	oveq12d 7410	. . 3 ⊢ ((𝜑 ∧ (𝑞 ∈ 𝐵 ∧ 𝑟 ∈ 𝐵)) → ((𝐻‘𝑞)(+_g‘𝑅)(𝐻‘𝑟)) = ((𝑞‘𝐹)(+_g‘𝑅)(𝑟‘𝐹)))
47	34, 39, 46	3eqtr4d 2806	. 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 19248	1 ⊢ (𝜑 → 𝐻 ∈ (𝑃 GrpHom 𝑅))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 399 = wceq 1559 ∈ wcel 2141 {crab 3413 Vcvv 3453 ↦ cmpt 5180 ^◡ccnv 5644 “ cima 5648 ‘cfv 6517 (class class class)co 7392 ∘_f cof 7654 ↑_m cmap 8803 Fincfn 8923 ℕcn 12207 ℕ₀cn0 12478 Basecbs 17228 +_gcplusg 17269 Grpcgrp 18958 GrpHom cghm 19236 mPoly cmpl 21938

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1814 ax-4 1828 ax-5 1929 ax-6 1986 ax-7 2027 ax-8 2143 ax-9 2151 ax-10 2174 ax-11 2190 ax-12 2211 ax-ext 2733 ax-rep 5226 ax-sep 5245 ax-nul 5255 ax-pow 5321 ax-pr 5389 ax-un 7714 ax-cnex 11126 ax-resscn 11127 ax-1cn 11128 ax-icn 11129 ax-addcl 11130 ax-addrcl 11131 ax-mulcl 11132 ax-mulrcl 11133 ax-mulcom 11134 ax-addass 11135 ax-mulass 11136 ax-distr 11137 ax-i2m1 11138 ax-1ne0 11139 ax-1rid 11140 ax-rnegex 11141 ax-rrecex 11142 ax-cnre 11143 ax-pre-lttri 11144 ax-pre-lttrn 11145 ax-pre-ltadd 11146 ax-pre-mulgt0 11147

This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3or 1098 df-3an 1099 df-tru 1562 df-fal 1572 df-ex 1799 df-nf 1803 df-sb 2090 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-nel 3061 df-ral 3076 df-rex 3086 df-rmo 3366 df-reu 3367 df-rab 3414 df-v 3455 df-sbc 3745 df-csb 3853 df-dif 3907 df-un 3909 df-in 3911 df-ss 3921 df-pss 3924 df-nul 4286 df-if 4480 df-pw 4556 df-sn 4582 df-pr 4584 df-tp 4586 df-op 4588 df-uni 4865 df-iun 4950 df-br 5100 df-opab 5162 df-mpt 5181 df-tr 5207 df-id 5540 df-eprel 5545 df-po 5553 df-so 5554 df-fr 5598 df-we 5600 df-xp 5651 df-rel 5652 df-cnv 5653 df-co 5654 df-dm 5655 df-rn 5656 df-res 5657 df-ima 5658 df-pred 6284 df-ord 6345 df-on 6346 df-lim 6347 df-suc 6348 df-iota 6473 df-fun 6519 df-fn 6520 df-f 6521 df-f1 6522 df-fo 6523 df-f1o 6524 df-fv 6525 df-riota 7349 df-ov 7395 df-oprab 7396 df-mpo 7397 df-of 7656 df-om 7843 df-1st 7966 df-2nd 7967 df-supp 8136 df-frecs 8257 df-wrecs 8288 df-recs 8337 df-rdg 8376 df-1o 8432 df-er 8673 df-map 8805 df-ixp 8876 df-en 8924 df-dom 8925 df-sdom 8926 df-fin 8927 df-fsupp 9305 df-sup 9385 df-pnf 11215 df-mnf 11216 df-xr 11217 df-ltxr 11218 df-le 11219 df-sub 11413 df-neg 11414 df-nn 12208 df-2 12277 df-3 12278 df-4 12279 df-5 12280 df-6 12281 df-7 12282 df-8 12283 df-9 12284 df-n0 12479 df-z 12566 df-dec 12686 df-uz 12837 df-fz 13510 df-struct 17166 df-sets 17183 df-slot 17201 df-ndx 17213 df-base 17229 df-ress 17250 df-plusg 17282 df-mulr 17283 df-sca 17285 df-vsca 17286 df-ip 17287 df-tset 17288 df-ple 17289 df-ds 17291 df-hom 17293 df-cco 17294 df-0g 17453 df-prds 17459 df-pws 17461 df-mgm 18657 df-sgrp 18736 df-mnd 18752 df-grp 18961 df-minusg 18962 df-subg 19148 df-ghm 19237 df-psr 21941 df-mpl 21943

This theorem is referenced by: selvvvval 22175 evlselv 43135

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