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Theorem evlssca 22028

Description: Polynomial evaluation maps scalars to constant functions. (Contributed by Stefan O'Rear, 13-Mar-2015.) (Proof shortened by AV, 18-Sep-2021.)

**Hypotheses**
Ref	Expression
evlssca.q	⊢ 𝑄 = ((𝐼 evalSub 𝑆)‘𝑅)
evlssca.w	⊢ 𝑊 = (𝐼 mPoly 𝑈)
evlssca.u	⊢ 𝑈 = (𝑆 ↾_s 𝑅)
evlssca.b	⊢ 𝐵 = (Base‘𝑆)
evlssca.a	⊢ 𝐴 = (algSc‘𝑊)
evlssca.i	⊢ (𝜑 → 𝐼 ∈ 𝑉)
evlssca.s	⊢ (𝜑 → 𝑆 ∈ CRing)
evlssca.r	⊢ (𝜑 → 𝑅 ∈ (SubRing‘𝑆))
evlssca.x	⊢ (𝜑 → 𝑋 ∈ 𝑅)

**Assertion**
Ref	Expression
evlssca	⊢ (𝜑 → (𝑄‘(𝐴‘𝑋)) = ((𝐵 ↑_m 𝐼) × {𝑋}))

Proof of Theorem evlssca Dummy variables 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		evlssca.i	. . . . 5 ⊢ (𝜑 → 𝐼 ∈ 𝑉)
2		evlssca.s	. . . . 5 ⊢ (𝜑 → 𝑆 ∈ CRing)
3		evlssca.r	. . . . 5 ⊢ (𝜑 → 𝑅 ∈ (SubRing‘𝑆))
4		evlssca.q	. . . . . 6 ⊢ 𝑄 = ((𝐼 evalSub 𝑆)‘𝑅)
5		evlssca.w	. . . . . 6 ⊢ 𝑊 = (𝐼 mPoly 𝑈)
6		eqid 2728	. . . . . 6 ⊢ (𝐼 mVar 𝑈) = (𝐼 mVar 𝑈)
7		evlssca.u	. . . . . 6 ⊢ 𝑈 = (𝑆 ↾_s 𝑅)
8		eqid 2728	. . . . . 6 ⊢ (𝑆 ↑_s (𝐵 ↑_m 𝐼)) = (𝑆 ↑_s (𝐵 ↑_m 𝐼))
9		evlssca.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑆)
10		evlssca.a	. . . . . 6 ⊢ 𝐴 = (algSc‘𝑊)
11		eqid 2728	. . . . . 6 ⊢ (𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥})) = (𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥}))
12		eqid 2728	. . . . . 6 ⊢ (𝑥 ∈ 𝐼 ↦ (𝑦 ∈ (𝐵 ↑_m 𝐼) ↦ (𝑦‘𝑥))) = (𝑥 ∈ 𝐼 ↦ (𝑦 ∈ (𝐵 ↑_m 𝐼) ↦ (𝑦‘𝑥)))
13	4, 5, 6, 7, 8, 9, 10, 11, 12	evlsval2 22026	. . . . 5 ⊢ ((𝐼 ∈ 𝑉 ∧ 𝑆 ∈ CRing ∧ 𝑅 ∈ (SubRing‘𝑆)) → (𝑄 ∈ (𝑊 RingHom (𝑆 ↑_s (𝐵 ↑_m 𝐼))) ∧ ((𝑄 ∘ 𝐴) = (𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥})) ∧ (𝑄 ∘ (𝐼 mVar 𝑈)) = (𝑥 ∈ 𝐼 ↦ (𝑦 ∈ (𝐵 ↑_m 𝐼) ↦ (𝑦‘𝑥))))))
14	1, 2, 3, 13	syl3anc 1369	. . . 4 ⊢ (𝜑 → (𝑄 ∈ (𝑊 RingHom (𝑆 ↑_s (𝐵 ↑_m 𝐼))) ∧ ((𝑄 ∘ 𝐴) = (𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥})) ∧ (𝑄 ∘ (𝐼 mVar 𝑈)) = (𝑥 ∈ 𝐼 ↦ (𝑦 ∈ (𝐵 ↑_m 𝐼) ↦ (𝑦‘𝑥))))))
15	14	simprld 771	. . 3 ⊢ (𝜑 → (𝑄 ∘ 𝐴) = (𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥})))
16	15	fveq1d 6893	. 2 ⊢ (𝜑 → ((𝑄 ∘ 𝐴)‘𝑋) = ((𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥}))‘𝑋))
17		eqid 2728	. . . . 5 ⊢ (Base‘𝑊) = (Base‘𝑊)
18		eqid 2728	. . . . 5 ⊢ (Base‘𝑈) = (Base‘𝑈)
19	7	subrgring 20506	. . . . . 6 ⊢ (𝑅 ∈ (SubRing‘𝑆) → 𝑈 ∈ Ring)
20	3, 19	syl 17	. . . . 5 ⊢ (𝜑 → 𝑈 ∈ Ring)
21	5, 17, 18, 10, 1, 20	mplasclf 22002	. . . 4 ⊢ (𝜑 → 𝐴:(Base‘𝑈)⟶(Base‘𝑊))
22	9	subrgss 20504	. . . . . 6 ⊢ (𝑅 ∈ (SubRing‘𝑆) → 𝑅 ⊆ 𝐵)
23	7, 9	ressbas2 17211	. . . . . 6 ⊢ (𝑅 ⊆ 𝐵 → 𝑅 = (Base‘𝑈))
24	3, 22, 23	3syl 18	. . . . 5 ⊢ (𝜑 → 𝑅 = (Base‘𝑈))
25	24	feq2d 6702	. . . 4 ⊢ (𝜑 → (𝐴:𝑅⟶(Base‘𝑊) ↔ 𝐴:(Base‘𝑈)⟶(Base‘𝑊)))
26	21, 25	mpbird 257	. . 3 ⊢ (𝜑 → 𝐴:𝑅⟶(Base‘𝑊))
27		evlssca.x	. . 3 ⊢ (𝜑 → 𝑋 ∈ 𝑅)
28		fvco3 6991	. . 3 ⊢ ((𝐴:𝑅⟶(Base‘𝑊) ∧ 𝑋 ∈ 𝑅) → ((𝑄 ∘ 𝐴)‘𝑋) = (𝑄‘(𝐴‘𝑋)))
29	26, 27, 28	syl2anc 583	. 2 ⊢ (𝜑 → ((𝑄 ∘ 𝐴)‘𝑋) = (𝑄‘(𝐴‘𝑋)))
30		sneq 4634	. . . . 5 ⊢ (𝑥 = 𝑋 → {𝑥} = {𝑋})
31	30	xpeq2d 5702	. . . 4 ⊢ (𝑥 = 𝑋 → ((𝐵 ↑_m 𝐼) × {𝑥}) = ((𝐵 ↑_m 𝐼) × {𝑋}))
32		ovex 7447	. . . . 5 ⊢ (𝐵 ↑_m 𝐼) ∈ V
33		snex 5427	. . . . 5 ⊢ {𝑋} ∈ V
34	32, 33	xpex 7749	. . . 4 ⊢ ((𝐵 ↑_m 𝐼) × {𝑋}) ∈ V
35	31, 11, 34	fvmpt 6999	. . 3 ⊢ (𝑋 ∈ 𝑅 → ((𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥}))‘𝑋) = ((𝐵 ↑_m 𝐼) × {𝑋}))
36	27, 35	syl 17	. 2 ⊢ (𝜑 → ((𝑥 ∈ 𝑅 ↦ ((𝐵 ↑_m 𝐼) × {𝑥}))‘𝑋) = ((𝐵 ↑_m 𝐼) × {𝑋}))
37	16, 29, 36	3eqtr3d 2776	1 ⊢ (𝜑 → (𝑄‘(𝐴‘𝑋)) = ((𝐵 ↑_m 𝐼) × {𝑋}))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ wa 395 = wceq 1534 ∈ wcel 2099 ⊆ wss 3945 {csn 4624 ↦ cmpt 5225 × cxp 5670 ∘ ccom 5676 ⟶wf 6538 ‘cfv 6542 (class class class)co 7414 ↑_m cmap 8838 Basecbs 17173 ↾_s cress 17202 ↑_s cpws 17421 Ringcrg 20166 CRingccrg 20167 RingHom crh 20401 SubRingcsubrg 20499 algSccascl 21779 mVar cmvr 21831 mPoly cmpl 21832 evalSub ces 22009

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 2699 ax-rep 5279 ax-sep 5293 ax-nul 5300 ax-pow 5359 ax-pr 5423 ax-un 7734 ax-cnex 11188 ax-resscn 11189 ax-1cn 11190 ax-icn 11191 ax-addcl 11192 ax-addrcl 11193 ax-mulcl 11194 ax-mulrcl 11195 ax-mulcom 11196 ax-addass 11197 ax-mulass 11198 ax-distr 11199 ax-i2m1 11200 ax-1ne0 11201 ax-1rid 11202 ax-rnegex 11203 ax-rrecex 11204 ax-cnre 11205 ax-pre-lttri 11206 ax-pre-lttrn 11207 ax-pre-ltadd 11208 ax-pre-mulgt0 11209

This theorem depends on definitions: df-bi 206 df-an 396 df-or 847 df-3or 1086 df-3an 1087 df-tru 1537 df-fal 1547 df-ex 1775 df-nf 1779 df-sb 2061 df-mo 2530 df-eu 2559 df-clab 2706 df-cleq 2720 df-clel 2806 df-nfc 2881 df-ne 2937 df-nel 3043 df-ral 3058 df-rex 3067 df-rmo 3372 df-reu 3373 df-rab 3429 df-v 3472 df-sbc 3776 df-csb 3891 df-dif 3948 df-un 3950 df-in 3952 df-ss 3962 df-pss 3964 df-nul 4319 df-if 4525 df-pw 4600 df-sn 4625 df-pr 4627 df-tp 4629 df-op 4631 df-uni 4904 df-int 4945 df-iun 4993 df-iin 4994 df-br 5143 df-opab 5205 df-mpt 5226 df-tr 5260 df-id 5570 df-eprel 5576 df-po 5584 df-so 5585 df-fr 5627 df-se 5628 df-we 5629 df-xp 5678 df-rel 5679 df-cnv 5680 df-co 5681 df-dm 5682 df-rn 5683 df-res 5684 df-ima 5685 df-pred 6299 df-ord 6366 df-on 6367 df-lim 6368 df-suc 6369 df-iota 6494 df-fun 6544 df-fn 6545 df-f 6546 df-f1 6547 df-fo 6548 df-f1o 6549 df-fv 6550 df-isom 6551 df-riota 7370 df-ov 7417 df-oprab 7418 df-mpo 7419 df-of 7679 df-ofr 7680 df-om 7865 df-1st 7987 df-2nd 7988 df-supp 8160 df-frecs 8280 df-wrecs 8311 df-recs 8385 df-rdg 8424 df-1o 8480 df-er 8718 df-map 8840 df-pm 8841 df-ixp 8910 df-en 8958 df-dom 8959 df-sdom 8960 df-fin 8961 df-fsupp 9380 df-sup 9459 df-oi 9527 df-card 9956 df-pnf 11274 df-mnf 11275 df-xr 11276 df-ltxr 11277 df-le 11278 df-sub 11470 df-neg 11471 df-nn 12237 df-2 12299 df-3 12300 df-4 12301 df-5 12302 df-6 12303 df-7 12304 df-8 12305 df-9 12306 df-n0 12497 df-z 12583 df-dec 12702 df-uz 12847 df-fz 13511 df-fzo 13654 df-seq 13993 df-hash 14316 df-struct 17109 df-sets 17126 df-slot 17144 df-ndx 17156 df-base 17174 df-ress 17203 df-plusg 17239 df-mulr 17240 df-sca 17242 df-vsca 17243 df-ip 17244 df-tset 17245 df-ple 17246 df-ds 17248 df-hom 17250 df-cco 17251 df-0g 17416 df-gsum 17417 df-prds 17422 df-pws 17424 df-mre 17559 df-mrc 17560 df-acs 17562 df-mgm 18593 df-sgrp 18672 df-mnd 18688 df-mhm 18733 df-submnd 18734 df-grp 18886 df-minusg 18887 df-sbg 18888 df-mulg 19017 df-subg 19071 df-ghm 19161 df-cntz 19261 df-cmn 19730 df-abl 19731 df-mgp 20068 df-rng 20086 df-ur 20115 df-srg 20120 df-ring 20168 df-cring 20169 df-rhm 20404 df-subrng 20476 df-subrg 20501 df-lmod 20738 df-lss 20809 df-lsp 20849 df-assa 21780 df-asp 21781 df-ascl 21782 df-psr 21835 df-mvr 21836 df-mpl 21837 df-evls 22011

This theorem is referenced by: evlsscasrng 22036 evlsca 22037 mpfconst 22040 mpfind 22046 evls1sca 22235 evl1sca 22246 pf1ind 22267 evlsscaval 41791

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