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Theorem mhmcompl 22333

Description: The composition of a monoid homomorphism and a polynomial is a polynomial. (Contributed by SN, 7-Feb-2025.)

**Hypotheses**
Ref	Expression
mhmcompl.p	⊢ 𝑃 = (𝐼 mPoly 𝑅)
mhmcompl.q	⊢ 𝑄 = (𝐼 mPoly 𝑆)
mhmcompl.b	⊢ 𝐵 = (Base‘𝑃)
mhmcompl.c	⊢ 𝐶 = (Base‘𝑄)
mhmcompl.h	⊢ (𝜑 → 𝐻 ∈ (𝑅 MndHom 𝑆))
mhmcompl.f	⊢ (𝜑 → 𝐹 ∈ 𝐵)

**Assertion**
Ref	Expression
mhmcompl	⊢ (𝜑 → (𝐻 ∘ 𝐹) ∈ 𝐶)

Proof of Theorem mhmcompl Dummy variable 𝑓 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		fvexd 6901	. . . 4 ⊢ (𝜑 → (Base‘𝑆) ∈ V)
2		eqid 2734	. . . . 5 ⊢ {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} = {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}
3		ovexd 7448	. . . . 5 ⊢ (𝜑 → (ℕ₀ ↑_m 𝐼) ∈ V)
4	2, 3	rabexd 5320	. . . 4 ⊢ (𝜑 → {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin} ∈ V)
5		mhmcompl.h	. . . . . 6 ⊢ (𝜑 → 𝐻 ∈ (𝑅 MndHom 𝑆))
6		eqid 2734	. . . . . . 7 ⊢ (Base‘𝑅) = (Base‘𝑅)
7		eqid 2734	. . . . . . 7 ⊢ (Base‘𝑆) = (Base‘𝑆)
8	6, 7	mhmf 18772	. . . . . 6 ⊢ (𝐻 ∈ (𝑅 MndHom 𝑆) → 𝐻:(Base‘𝑅)⟶(Base‘𝑆))
9	5, 8	syl 17	. . . . 5 ⊢ (𝜑 → 𝐻:(Base‘𝑅)⟶(Base‘𝑆))
10		mhmcompl.p	. . . . . 6 ⊢ 𝑃 = (𝐼 mPoly 𝑅)
11		mhmcompl.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑃)
12		mhmcompl.f	. . . . . 6 ⊢ (𝜑 → 𝐹 ∈ 𝐵)
13	10, 6, 11, 2, 12	mplelf 21973	. . . . 5 ⊢ (𝜑 → 𝐹:{𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}⟶(Base‘𝑅))
14	9, 13	fcod 6741	. . . 4 ⊢ (𝜑 → (𝐻 ∘ 𝐹):{𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}⟶(Base‘𝑆))
15	1, 4, 14	elmapdd 8863	. . 3 ⊢ (𝜑 → (𝐻 ∘ 𝐹) ∈ ((Base‘𝑆) ↑_m {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}))
16		eqid 2734	. . . 4 ⊢ (𝐼 mPwSer 𝑆) = (𝐼 mPwSer 𝑆)
17		eqid 2734	. . . 4 ⊢ (Base‘(𝐼 mPwSer 𝑆)) = (Base‘(𝐼 mPwSer 𝑆))
18	10, 11	mplrcl 21969	. . . . 5 ⊢ (𝐹 ∈ 𝐵 → 𝐼 ∈ V)
19	12, 18	syl 17	. . . 4 ⊢ (𝜑 → 𝐼 ∈ V)
20	16, 7, 2, 17, 19	psrbas 21908	. . 3 ⊢ (𝜑 → (Base‘(𝐼 mPwSer 𝑆)) = ((Base‘𝑆) ↑_m {𝑓 ∈ (ℕ₀ ↑_m 𝐼) ∣ (^◡𝑓 “ ℕ) ∈ Fin}))
21	15, 20	eleqtrrd 2836	. 2 ⊢ (𝜑 → (𝐻 ∘ 𝐹) ∈ (Base‘(𝐼 mPwSer 𝑆)))
22		fvexd 6901	. . 3 ⊢ (𝜑 → (0_g‘𝑆) ∈ V)
23		mhmrcl1 18770	. . . . 5 ⊢ (𝐻 ∈ (𝑅 MndHom 𝑆) → 𝑅 ∈ Mnd)
24	5, 23	syl 17	. . . 4 ⊢ (𝜑 → 𝑅 ∈ Mnd)
25		eqid 2734	. . . . 5 ⊢ (0_g‘𝑅) = (0_g‘𝑅)
26	6, 25	mndidcl 18732	. . . 4 ⊢ (𝑅 ∈ Mnd → (0_g‘𝑅) ∈ (Base‘𝑅))
27	24, 26	syl 17	. . 3 ⊢ (𝜑 → (0_g‘𝑅) ∈ (Base‘𝑅))
28		ssidd 3987	. . 3 ⊢ (𝜑 → (Base‘𝑅) ⊆ (Base‘𝑅))
29		fvexd 6901	. . 3 ⊢ (𝜑 → (Base‘𝑅) ∈ V)
30	10, 11, 25, 12	mplelsfi 21970	. . 3 ⊢ (𝜑 → 𝐹 finSupp (0_g‘𝑅))
31		eqid 2734	. . . . 5 ⊢ (0_g‘𝑆) = (0_g‘𝑆)
32	25, 31	mhm0 18777	. . . 4 ⊢ (𝐻 ∈ (𝑅 MndHom 𝑆) → (𝐻‘(0_g‘𝑅)) = (0_g‘𝑆))
33	5, 32	syl 17	. . 3 ⊢ (𝜑 → (𝐻‘(0_g‘𝑅)) = (0_g‘𝑆))
34	22, 27, 13, 9, 28, 4, 29, 30, 33	fsuppcor 9426	. 2 ⊢ (𝜑 → (𝐻 ∘ 𝐹) finSupp (0_g‘𝑆))
35		mhmcompl.q	. . 3 ⊢ 𝑄 = (𝐼 mPoly 𝑆)
36		mhmcompl.c	. . 3 ⊢ 𝐶 = (Base‘𝑄)
37	35, 16, 17, 31, 36	mplelbas 21966	. 2 ⊢ ((𝐻 ∘ 𝐹) ∈ 𝐶 ↔ ((𝐻 ∘ 𝐹) ∈ (Base‘(𝐼 mPwSer 𝑆)) ∧ (𝐻 ∘ 𝐹) finSupp (0_g‘𝑆)))
38	21, 34, 37	sylanbrc 583	1 ⊢ (𝜑 → (𝐻 ∘ 𝐹) ∈ 𝐶)

Colors of variables: wff setvar class

Syntax hints: → wi 4 = wceq 1539 ∈ wcel 2107 {crab 3419 Vcvv 3463 class class class wbr 5123 ^◡ccnv 5664 “ cima 5668 ∘ ccom 5669 ⟶wf 6537 ‘cfv 6541 (class class class)co 7413 ↑_m cmap 8848 Fincfn 8967 finSupp cfsupp 9383 ℕcn 12248 ℕ₀cn0 12509 Basecbs 17230 0_gc0g 17456 Mndcmnd 18717 MndHom cmhm 18764 mPwSer cmps 21879 mPoly cmpl 21881

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1794 ax-4 1808 ax-5 1909 ax-6 1966 ax-7 2006 ax-8 2109 ax-9 2117 ax-10 2140 ax-11 2156 ax-12 2176 ax-ext 2706 ax-rep 5259 ax-sep 5276 ax-nul 5286 ax-pow 5345 ax-pr 5412 ax-un 7737 ax-cnex 11193 ax-resscn 11194 ax-1cn 11195 ax-icn 11196 ax-addcl 11197 ax-addrcl 11198 ax-mulcl 11199 ax-mulrcl 11200 ax-mulcom 11201 ax-addass 11202 ax-mulass 11203 ax-distr 11204 ax-i2m1 11205 ax-1ne0 11206 ax-1rid 11207 ax-rnegex 11208 ax-rrecex 11209 ax-cnre 11210 ax-pre-lttri 11211 ax-pre-lttrn 11212 ax-pre-ltadd 11213 ax-pre-mulgt0 11214

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1779 df-nf 1783 df-sb 2064 df-mo 2538 df-eu 2567 df-clab 2713 df-cleq 2726 df-clel 2808 df-nfc 2884 df-ne 2932 df-nel 3036 df-ral 3051 df-rex 3060 df-rmo 3363 df-reu 3364 df-rab 3420 df-v 3465 df-sbc 3771 df-csb 3880 df-dif 3934 df-un 3936 df-in 3938 df-ss 3948 df-pss 3951 df-nul 4314 df-if 4506 df-pw 4582 df-sn 4607 df-pr 4609 df-tp 4611 df-op 4613 df-uni 4888 df-iun 4973 df-br 5124 df-opab 5186 df-mpt 5206 df-tr 5240 df-id 5558 df-eprel 5564 df-po 5572 df-so 5573 df-fr 5617 df-we 5619 df-xp 5671 df-rel 5672 df-cnv 5673 df-co 5674 df-dm 5675 df-rn 5676 df-res 5677 df-ima 5678 df-pred 6301 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6543 df-fn 6544 df-f 6545 df-f1 6546 df-fo 6547 df-f1o 6548 df-fv 6549 df-riota 7370 df-ov 7416 df-oprab 7417 df-mpo 7418 df-of 7679 df-om 7870 df-1st 7996 df-2nd 7997 df-supp 8168 df-frecs 8288 df-wrecs 8319 df-recs 8393 df-rdg 8432 df-1o 8488 df-er 8727 df-map 8850 df-en 8968 df-dom 8969 df-sdom 8970 df-fin 8971 df-fsupp 9384 df-pnf 11279 df-mnf 11280 df-xr 11281 df-ltxr 11282 df-le 11283 df-sub 11476 df-neg 11477 df-nn 12249 df-2 12311 df-3 12312 df-4 12313 df-5 12314 df-6 12315 df-7 12316 df-8 12317 df-9 12318 df-n0 12510 df-z 12597 df-uz 12861 df-fz 13530 df-struct 17167 df-sets 17184 df-slot 17202 df-ndx 17214 df-base 17231 df-ress 17254 df-plusg 17287 df-mulr 17288 df-sca 17290 df-vsca 17291 df-tset 17293 df-0g 17458 df-mgm 18623 df-sgrp 18702 df-mnd 18718 df-mhm 18766 df-psr 21884 df-mpl 21886

This theorem is referenced by: mhmcoaddmpl 22334 rhmcomulmpl 22335 rhmmpl 22336 mhmcoply1 22338 selvcllem4 42570 selvvvval 42574 selvadd 42577 selvmul 42578

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