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Theorem facth1 26105

Description: The factor theorem and its converse. A polynomial 𝐹 has a root at 𝐴 iff 𝐺 = 𝑥 − 𝐴 is a factor of 𝐹. (Contributed by Mario Carneiro, 12-Jun-2015.)

**Hypotheses**
Ref	Expression
ply1rem.p	⊢ 𝑃 = (Poly₁‘𝑅)
ply1rem.b	⊢ 𝐵 = (Base‘𝑃)
ply1rem.k	⊢ 𝐾 = (Base‘𝑅)
ply1rem.x	⊢ 𝑋 = (var₁‘𝑅)
ply1rem.m	⊢ − = (-_g‘𝑃)
ply1rem.a	⊢ 𝐴 = (algSc‘𝑃)
ply1rem.g	⊢ 𝐺 = (𝑋 − (𝐴‘𝑁))
ply1rem.o	⊢ 𝑂 = (eval₁‘𝑅)
ply1rem.1	⊢ (𝜑 → 𝑅 ∈ NzRing)
ply1rem.2	⊢ (𝜑 → 𝑅 ∈ CRing)
ply1rem.3	⊢ (𝜑 → 𝑁 ∈ 𝐾)
ply1rem.4	⊢ (𝜑 → 𝐹 ∈ 𝐵)
facth1.z	⊢ 0 = (0_g‘𝑅)
facth1.d	⊢ ∥ = (∥_r‘𝑃)

**Assertion**
Ref	Expression
facth1	⊢ (𝜑 → (𝐺 ∥ 𝐹 ↔ ((𝑂‘𝐹)‘𝑁) = 0 ))

**Proof of Theorem facth1**
Step	Hyp	Ref	Expression
1		ply1rem.1	. . . 4 ⊢ (𝜑 → 𝑅 ∈ NzRing)
2		nzrring 20437	. . . 4 ⊢ (𝑅 ∈ NzRing → 𝑅 ∈ Ring)
3	1, 2	syl 17	. . 3 ⊢ (𝜑 → 𝑅 ∈ Ring)
4		ply1rem.4	. . 3 ⊢ (𝜑 → 𝐹 ∈ 𝐵)
5		ply1rem.p	. . . . . 6 ⊢ 𝑃 = (Poly₁‘𝑅)
6		ply1rem.b	. . . . . 6 ⊢ 𝐵 = (Base‘𝑃)
7		ply1rem.k	. . . . . 6 ⊢ 𝐾 = (Base‘𝑅)
8		ply1rem.x	. . . . . 6 ⊢ 𝑋 = (var₁‘𝑅)
9		ply1rem.m	. . . . . 6 ⊢ − = (-_g‘𝑃)
10		ply1rem.a	. . . . . 6 ⊢ 𝐴 = (algSc‘𝑃)
11		ply1rem.g	. . . . . 6 ⊢ 𝐺 = (𝑋 − (𝐴‘𝑁))
12		ply1rem.o	. . . . . 6 ⊢ 𝑂 = (eval₁‘𝑅)
13		ply1rem.2	. . . . . 6 ⊢ (𝜑 → 𝑅 ∈ CRing)
14		ply1rem.3	. . . . . 6 ⊢ (𝜑 → 𝑁 ∈ 𝐾)
15		eqid 2731	. . . . . 6 ⊢ (Monic_1p‘𝑅) = (Monic_1p‘𝑅)
16		eqid 2731	. . . . . 6 ⊢ (deg₁‘𝑅) = (deg₁‘𝑅)
17		facth1.z	. . . . . 6 ⊢ 0 = (0_g‘𝑅)
18	5, 6, 7, 8, 9, 10, 11, 12, 1, 13, 14, 15, 16, 17	ply1remlem 26103	. . . . 5 ⊢ (𝜑 → (𝐺 ∈ (Monic_1p‘𝑅) ∧ ((deg₁‘𝑅)‘𝐺) = 1 ∧ (^◡(𝑂‘𝐺) “ { 0 }) = {𝑁}))
19	18	simp1d 1142	. . . 4 ⊢ (𝜑 → 𝐺 ∈ (Monic_1p‘𝑅))
20		eqid 2731	. . . . 5 ⊢ (Unic_1p‘𝑅) = (Unic_1p‘𝑅)
21	20, 15	mon1puc1p 26089	. . . 4 ⊢ ((𝑅 ∈ Ring ∧ 𝐺 ∈ (Monic_1p‘𝑅)) → 𝐺 ∈ (Unic_1p‘𝑅))
22	3, 19, 21	syl2anc 584	. . 3 ⊢ (𝜑 → 𝐺 ∈ (Unic_1p‘𝑅))
23		facth1.d	. . . 4 ⊢ ∥ = (∥_r‘𝑃)
24		eqid 2731	. . . 4 ⊢ (0_g‘𝑃) = (0_g‘𝑃)
25		eqid 2731	. . . 4 ⊢ (rem_1p‘𝑅) = (rem_1p‘𝑅)
26	5, 23, 6, 20, 24, 25	dvdsr1p 26102	. . 3 ⊢ ((𝑅 ∈ Ring ∧ 𝐹 ∈ 𝐵 ∧ 𝐺 ∈ (Unic_1p‘𝑅)) → (𝐺 ∥ 𝐹 ↔ (𝐹(rem_1p‘𝑅)𝐺) = (0_g‘𝑃)))
27	3, 4, 22, 26	syl3anc 1373	. 2 ⊢ (𝜑 → (𝐺 ∥ 𝐹 ↔ (𝐹(rem_1p‘𝑅)𝐺) = (0_g‘𝑃)))
28	5, 6, 7, 8, 9, 10, 11, 12, 1, 13, 14, 4, 25	ply1rem 26104	. . 3 ⊢ (𝜑 → (𝐹(rem_1p‘𝑅)𝐺) = (𝐴‘((𝑂‘𝐹)‘𝑁)))
29	5, 10, 17, 24	ply1scl0 22210	. . . . 5 ⊢ (𝑅 ∈ Ring → (𝐴‘ 0 ) = (0_g‘𝑃))
30	3, 29	syl 17	. . . 4 ⊢ (𝜑 → (𝐴‘ 0 ) = (0_g‘𝑃))
31	30	eqcomd 2737	. . 3 ⊢ (𝜑 → (0_g‘𝑃) = (𝐴‘ 0 ))
32	28, 31	eqeq12d 2747	. 2 ⊢ (𝜑 → ((𝐹(rem_1p‘𝑅)𝐺) = (0_g‘𝑃) ↔ (𝐴‘((𝑂‘𝐹)‘𝑁)) = (𝐴‘ 0 )))
33	5, 10, 7, 6	ply1sclf1 22209	. . . 4 ⊢ (𝑅 ∈ Ring → 𝐴:𝐾–1-1→𝐵)
34	3, 33	syl 17	. . 3 ⊢ (𝜑 → 𝐴:𝐾–1-1→𝐵)
35	12, 5, 7, 6, 13, 14, 4	fveval1fvcl 22254	. . 3 ⊢ (𝜑 → ((𝑂‘𝐹)‘𝑁) ∈ 𝐾)
36	7, 17	ring0cl 20191	. . . 4 ⊢ (𝑅 ∈ Ring → 0 ∈ 𝐾)
37	3, 36	syl 17	. . 3 ⊢ (𝜑 → 0 ∈ 𝐾)
38		f1fveq 7202	. . 3 ⊢ ((𝐴:𝐾–1-1→𝐵 ∧ (((𝑂‘𝐹)‘𝑁) ∈ 𝐾 ∧ 0 ∈ 𝐾)) → ((𝐴‘((𝑂‘𝐹)‘𝑁)) = (𝐴‘ 0 ) ↔ ((𝑂‘𝐹)‘𝑁) = 0 ))
39	34, 35, 37, 38	syl12anc 836	. 2 ⊢ (𝜑 → ((𝐴‘((𝑂‘𝐹)‘𝑁)) = (𝐴‘ 0 ) ↔ ((𝑂‘𝐹)‘𝑁) = 0 ))
40	27, 32, 39	3bitrd 305	1 ⊢ (𝜑 → (𝐺 ∥ 𝐹 ↔ ((𝑂‘𝐹)‘𝑁) = 0 ))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 206 = wceq 1541 ∈ wcel 2111 {csn 4575 class class class wbr 5093 ^◡ccnv 5618 “ cima 5622 –1-1→wf1 6484 ‘cfv 6487 (class class class)co 7352 1c1 11013 Basecbs 17126 0_gc0g 17349 -_gcsg 18854 Ringcrg 20157 CRingccrg 20158 ∥_rcdsr 20278 NzRingcnzr 20433 algSccascl 21795 var₁cv1 22094 Poly₁cpl1 22095 eval₁ce1 22235 deg₁cdg1 25992 Monic_1pcmn1 26064 Unic_1pcuc1p 26065 rem_1pcr1p 26067

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1968 ax-7 2009 ax-8 2113 ax-9 2121 ax-10 2144 ax-11 2160 ax-12 2180 ax-ext 2703 ax-rep 5219 ax-sep 5236 ax-nul 5246 ax-pow 5305 ax-pr 5372 ax-un 7674 ax-cnex 11068 ax-resscn 11069 ax-1cn 11070 ax-icn 11071 ax-addcl 11072 ax-addrcl 11073 ax-mulcl 11074 ax-mulrcl 11075 ax-mulcom 11076 ax-addass 11077 ax-mulass 11078 ax-distr 11079 ax-i2m1 11080 ax-1ne0 11081 ax-1rid 11082 ax-rnegex 11083 ax-rrecex 11084 ax-cnre 11085 ax-pre-lttri 11086 ax-pre-lttrn 11087 ax-pre-ltadd 11088 ax-pre-mulgt0 11089 ax-pre-sup 11090 ax-addf 11091

This theorem depends on definitions: df-bi 207 df-an 396 df-or 848 df-3or 1087 df-3an 1088 df-tru 1544 df-fal 1554 df-ex 1781 df-nf 1785 df-sb 2068 df-mo 2535 df-eu 2564 df-clab 2710 df-cleq 2723 df-clel 2806 df-nfc 2881 df-ne 2929 df-nel 3033 df-ral 3048 df-rex 3057 df-rmo 3346 df-reu 3347 df-rab 3396 df-v 3438 df-sbc 3737 df-csb 3846 df-dif 3900 df-un 3902 df-in 3904 df-ss 3914 df-pss 3917 df-nul 4283 df-if 4475 df-pw 4551 df-sn 4576 df-pr 4578 df-tp 4580 df-op 4582 df-uni 4859 df-int 4898 df-iun 4943 df-iin 4944 df-br 5094 df-opab 5156 df-mpt 5175 df-tr 5201 df-id 5514 df-eprel 5519 df-po 5527 df-so 5528 df-fr 5572 df-se 5573 df-we 5574 df-xp 5625 df-rel 5626 df-cnv 5627 df-co 5628 df-dm 5629 df-rn 5630 df-res 5631 df-ima 5632 df-pred 6254 df-ord 6315 df-on 6316 df-lim 6317 df-suc 6318 df-iota 6443 df-fun 6489 df-fn 6490 df-f 6491 df-f1 6492 df-fo 6493 df-f1o 6494 df-fv 6495 df-isom 6496 df-riota 7309 df-ov 7355 df-oprab 7356 df-mpo 7357 df-of 7616 df-ofr 7617 df-om 7803 df-1st 7927 df-2nd 7928 df-supp 8097 df-tpos 8162 df-frecs 8217 df-wrecs 8248 df-recs 8297 df-rdg 8335 df-1o 8391 df-2o 8392 df-er 8628 df-map 8758 df-pm 8759 df-ixp 8828 df-en 8876 df-dom 8877 df-sdom 8878 df-fin 8879 df-fsupp 9252 df-sup 9332 df-oi 9402 df-card 9838 df-pnf 11154 df-mnf 11155 df-xr 11156 df-ltxr 11157 df-le 11158 df-sub 11352 df-neg 11353 df-nn 12132 df-2 12194 df-3 12195 df-4 12196 df-5 12197 df-6 12198 df-7 12199 df-8 12200 df-9 12201 df-n0 12388 df-z 12475 df-dec 12595 df-uz 12739 df-fz 13414 df-fzo 13561 df-seq 13915 df-hash 14244 df-struct 17064 df-sets 17081 df-slot 17099 df-ndx 17111 df-base 17127 df-ress 17148 df-plusg 17180 df-mulr 17181 df-starv 17182 df-sca 17183 df-vsca 17184 df-ip 17185 df-tset 17186 df-ple 17187 df-ds 17189 df-unif 17190 df-hom 17191 df-cco 17192 df-0g 17351 df-gsum 17352 df-prds 17357 df-pws 17359 df-mre 17494 df-mrc 17495 df-acs 17497 df-mgm 18554 df-sgrp 18633 df-mnd 18649 df-mhm 18697 df-submnd 18698 df-grp 18855 df-minusg 18856 df-sbg 18857 df-mulg 18987 df-subg 19042 df-ghm 19131 df-cntz 19235 df-cmn 19700 df-abl 19701 df-mgp 20065 df-rng 20077 df-ur 20106 df-srg 20111 df-ring 20159 df-cring 20160 df-oppr 20261 df-dvdsr 20281 df-unit 20282 df-invr 20312 df-rhm 20396 df-nzr 20434 df-subrng 20467 df-subrg 20491 df-rlreg 20615 df-lmod 20801 df-lss 20871 df-lsp 20911 df-cnfld 21298 df-assa 21796 df-asp 21797 df-ascl 21798 df-psr 21852 df-mvr 21853 df-mpl 21854 df-opsr 21856 df-evls 22015 df-evl 22016 df-psr1 22098 df-vr1 22099 df-ply1 22100 df-coe1 22101 df-evl1 22237 df-mdeg 25993 df-deg1 25994 df-mon1 26069 df-uc1p 26070 df-q1p 26071 df-r1p 26072

This theorem is referenced by: fta1glem1 26106 fta1glem2 26107

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