Theorem gsummulsubdishift1s 33327

Description: Distribute a subtraction over an indexed sum, shift one of the resulting sums, and regroup terms. (Contributed by Thierry Arnoux, 15-Feb-2026.)

Hypotheses

Ref	Expression
gsummulsubdishift.b	⊢ 𝐵 = (Base‘𝑅)
gsummulsubdishift.p	⊢ + = (+g‘𝑅)
gsummulsubdishift.m	⊢ − = (-g‘𝑅)
gsummulsubdishift.t	⊢ · = (.r‘𝑅)
gsummulsubdishift.r	⊢ (𝜑 → 𝑅 ∈ Ring)
gsummulsubdishift.a	⊢ (𝜑 → 𝐴 ∈ 𝐵)
gsummulsubdishift.c	⊢ (𝜑 → 𝐶 ∈ 𝐵)
gsummulsubdishift.n	⊢ (𝜑 → 𝑁 ∈ ℕ0)
gsummulsubdishifts.d	⊢ ((𝜑 ∧ 𝑖 ∈ (0...𝑁)) → 𝑉 ∈ 𝐵)
gsummulsubdishift1s.1	⊢ (𝑖 = 0 → 𝑉 = 𝐺)
gsummulsubdishift1s.2	⊢ (𝑖 = 𝑁 → 𝑉 = 𝐻)
gsummulsubdishift1s.3	⊢ (𝑖 = 𝑘 → 𝑉 = 𝑃)
gsummulsubdishift1s.4	⊢ (𝑖 = (𝑘 + 1) → 𝑉 = 𝑄)
gsummulsubdishift1s.e	⊢ (𝜑 → 𝐸 = ((𝐻 · 𝐴) − (𝐺 · 𝐶)))
gsummulsubdishift1s.f	⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝐹 = ((𝑃 · 𝐴) − (𝑄 · 𝐶)))

Assertion

Ref	Expression
gsummulsubdishift1s	⊢ (𝜑 → ((𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0..^𝑁) ↦ 𝐹)) + 𝐸))

Distinct variable groups:   − ,𝑘   · ,𝑘   𝐴,𝑘   𝐵,𝑘   𝐶,𝑘   𝑘,𝑁   𝑅,𝑘   𝜑,𝑘   𝐵,𝑖,𝑘   𝑖,𝐺   𝑖,𝐻   𝑖,𝑁   𝑃,𝑖   𝑄,𝑖   𝑘,𝑉   𝜑,𝑖

Allowed substitution hints:   𝐴(𝑖)   𝐶(𝑖)   𝑃(𝑘)   + (𝑖,𝑘)   𝑄(𝑘)   𝑅(𝑖)   · (𝑖)   𝐸(𝑖,𝑘)   𝐹(𝑖,𝑘)   𝐺(𝑘)   𝐻(𝑘)   − (𝑖)   𝑉(𝑖)

Proof of Theorem gsummulsubdishift1s

Step	Hyp	Ref	Expression
1		gsummulsubdishift1s.3	. . . . 5 ⊢ (𝑖 = 𝑘 → 𝑉 = 𝑃)
2	1	cbvmptv 5216	. . . 4 ⊢ (𝑖 ∈ (0...𝑁) ↦ 𝑉) = (𝑘 ∈ (0...𝑁) ↦ 𝑃)
3	2	oveq2i 7419	. . 3 ⊢ (𝑅 Σg (𝑖 ∈ (0...𝑁) ↦ 𝑉)) = (𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃))
4	3	oveq1i 7418	. 2 ⊢ ((𝑅 Σg (𝑖 ∈ (0...𝑁) ↦ 𝑉)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃)) · (𝐴 − 𝐶))
5		gsummulsubdishift.b	. . 3 ⊢ 𝐵 = (Base‘𝑅)
6		gsummulsubdishift.p	. . 3 ⊢ + = (+g‘𝑅)
7		gsummulsubdishift.m	. . 3 ⊢ − = (-g‘𝑅)
8		gsummulsubdishift.t	. . 3 ⊢ · = (.r‘𝑅)
9		gsummulsubdishift.r	. . 3 ⊢ (𝜑 → 𝑅 ∈ Ring)
10		gsummulsubdishift.a	. . 3 ⊢ (𝜑 → 𝐴 ∈ 𝐵)
11		gsummulsubdishift.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ 𝐵)
12		gsummulsubdishift.n	. . 3 ⊢ (𝜑 → 𝑁 ∈ ℕ0)
13		gsummulsubdishifts.d	. . . 4 ⊢ ((𝜑 ∧ 𝑖 ∈ (0...𝑁)) → 𝑉 ∈ 𝐵)
14	13	fmpttd 7108	. . 3 ⊢ (𝜑 → (𝑖 ∈ (0...𝑁) ↦ 𝑉):(0...𝑁)⟶𝐵)
15		gsummulsubdishift1s.e	. . . 4 ⊢ (𝜑 → 𝐸 = ((𝐻 · 𝐴) − (𝐺 · 𝐶)))
16		eqid 2769	. . . . . . 7 ⊢ (𝑖 ∈ (0...𝑁) ↦ 𝑉) = (𝑖 ∈ (0...𝑁) ↦ 𝑉)
17		gsummulsubdishift1s.2	. . . . . . 7 ⊢ (𝑖 = 𝑁 → 𝑉 = 𝐻)
18		nn0fz0 13649	. . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 ↔ 𝑁 ∈ (0...𝑁))
19	12, 18	sylib 221	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ (0...𝑁))
20	17	adantl 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 = 𝑁) → 𝑉 = 𝐻)
21	12, 20	csbied 3897	. . . . . . . 8 ⊢ (𝜑 → ⦋𝑁 / 𝑖⦌𝑉 = 𝐻)
22	13	ralrimiva 3163	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵)
23		rspcsbela 4401	. . . . . . . . 9 ⊢ ((𝑁 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋𝑁 / 𝑖⦌𝑉 ∈ 𝐵)
24	19, 22, 23	syl2anc 595	. . . . . . . 8 ⊢ (𝜑 → ⦋𝑁 / 𝑖⦌𝑉 ∈ 𝐵)
25	21, 24	eqeltrrd 2870	. . . . . . 7 ⊢ (𝜑 → 𝐻 ∈ 𝐵)
26	16, 17, 19, 25	fvmptd3 7011	. . . . . 6 ⊢ (𝜑 → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) = 𝐻)
27	26	oveq1d 7423	. . . . 5 ⊢ (𝜑 → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) · 𝐴) = (𝐻 · 𝐴))
28		gsummulsubdishift1s.1	. . . . . . 7 ⊢ (𝑖 = 0 → 𝑉 = 𝐺)
29		0elfz 13648	. . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 0 ∈ (0...𝑁))
30	12, 29	syl 18	. . . . . . 7 ⊢ (𝜑 → 0 ∈ (0...𝑁))
31	28	adantl 486	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 = 0) → 𝑉 = 𝐺)
32	30, 31	csbied 3897	. . . . . . . 8 ⊢ (𝜑 → ⦋0 / 𝑖⦌𝑉 = 𝐺)
33		rspcsbela 4401	. . . . . . . . 9 ⊢ ((0 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋0 / 𝑖⦌𝑉 ∈ 𝐵)
34	30, 22, 33	syl2anc 595	. . . . . . . 8 ⊢ (𝜑 → ⦋0 / 𝑖⦌𝑉 ∈ 𝐵)
35	32, 34	eqeltrrd 2870	. . . . . . 7 ⊢ (𝜑 → 𝐺 ∈ 𝐵)
36	16, 28, 30, 35	fvmptd3 7011	. . . . . 6 ⊢ (𝜑 → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) = 𝐺)
37	36	oveq1d 7423	. . . . 5 ⊢ (𝜑 → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) · 𝐶) = (𝐺 · 𝐶))
38	27, 37	oveq12d 7426	. . . 4 ⊢ (𝜑 → ((((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) · 𝐴) − (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) · 𝐶)) = ((𝐻 · 𝐴) − (𝐺 · 𝐶)))
39	15, 38	eqtr4d 2807	. . 3 ⊢ (𝜑 → 𝐸 = ((((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) · 𝐴) − (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) · 𝐶)))
40		gsummulsubdishift1s.f	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝐹 = ((𝑃 · 𝐴) − (𝑄 · 𝐶)))
41		fzossfz 13703	. . . . . . . 8 ⊢ (0..^𝑁) ⊆ (0...𝑁)
42		simpr 489	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑘 ∈ (0..^𝑁))
43	41, 42	sselid 3943	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑘 ∈ (0...𝑁))
44	1	adantl 486	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) ∧ 𝑖 = 𝑘) → 𝑉 = 𝑃)
45	42, 44	csbied 3897	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋𝑘 / 𝑖⦌𝑉 = 𝑃)
46	22	adantr 485	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵)
47		rspcsbela 4401	. . . . . . . . 9 ⊢ ((𝑘 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋𝑘 / 𝑖⦌𝑉 ∈ 𝐵)
48	43, 46, 47	syl2anc 595	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋𝑘 / 𝑖⦌𝑉 ∈ 𝐵)
49	45, 48	eqeltrrd 2870	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑃 ∈ 𝐵)
50	16, 1, 43, 49	fvmptd3 7011	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) = 𝑃)
51	50	oveq1d 7423	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) · 𝐴) = (𝑃 · 𝐴))
52		gsummulsubdishift1s.4	. . . . . . 7 ⊢ (𝑖 = (𝑘 + 1) → 𝑉 = 𝑄)
53		fzofzp1 13789	. . . . . . . 8 ⊢ (𝑘 ∈ (0..^𝑁) → (𝑘 + 1) ∈ (0...𝑁))
54	53	adantl 486	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (𝑘 + 1) ∈ (0...𝑁))
55	52	adantl 486	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) ∧ 𝑖 = (𝑘 + 1)) → 𝑉 = 𝑄)
56	54, 55	csbied 3897	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 = 𝑄)
57		rspcsbela 4401	. . . . . . . . 9 ⊢ (((𝑘 + 1) ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 ∈ 𝐵)
58	54, 46, 57	syl2anc 595	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 ∈ 𝐵)
59	56, 58	eqeltrrd 2870	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑄 ∈ 𝐵)
60	16, 52, 54, 59	fvmptd3 7011	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) = 𝑄)
61	60	oveq1d 7423	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) · 𝐶) = (𝑄 · 𝐶))
62	51, 61	oveq12d 7426	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ((((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) · 𝐴) − (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) · 𝐶)) = ((𝑃 · 𝐴) − (𝑄 · 𝐶)))
63	40, 62	eqtr4d 2807	. . 3 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝐹 = ((((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) · 𝐴) − (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) · 𝐶)))
64	5, 6, 7, 8, 9, 10, 11, 12, 14, 39, 63	gsummulsubdishift1 33325	. 2 ⊢ (𝜑 → ((𝑅 Σg (𝑖 ∈ (0...𝑁) ↦ 𝑉)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0..^𝑁) ↦ 𝐹)) + 𝐸))
65	4, 64	eqtr3id 2818	1 ⊢ (𝜑 → ((𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0..^𝑁) ↦ 𝐹)) + 𝐸))

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1567   ∈ wcel 2149  ∀wral 3085  ⦋csb 3861   ↦ cmpt 5193  ‘cfv 6533  (class class class)co 7408  0cc0 11096  1c1 11097   + caddc 11099  ℕ₀cn0 12500  ...cfz 13531  ..^cfzo 13678  Basecbs 17265  +_gcplusg 17306  ._rcmulr 17307   Σ_g cgsu 17489  -_gcsg 18998  Ringcrg 20311

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-rep 5239  ax-sep 5258  ax-nul 5268  ax-pow 5334  ax-pr 5402  ax-un 7730  ax-cnex 11152  ax-resscn 11153  ax-1cn 11154  ax-icn 11155  ax-addcl 11156  ax-addrcl 11157  ax-mulcl 11158  ax-mulrcl 11159  ax-mulcom 11160  ax-addass 11161  ax-mulass 11162  ax-distr 11163  ax-i2m1 11164  ax-1ne0 11165  ax-1rid 11166  ax-rnegex 11167  ax-rrecex 11168  ax-cnre 11169  ax-pre-lttri 11170  ax-pre-lttrn 11171  ax-pre-ltadd 11172  ax-pre-mulgt0 11173

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-nel 3071  df-ral 3086  df-rex 3096  df-rmo 3376  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3933  df-nul 4295  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4874  df-int 4914  df-iun 4959  df-iin 4960  df-br 5111  df-opab 5175  df-mpt 5194  df-tr 5220  df-id 5554  df-eprel 5559  df-po 5567  df-so 5568  df-fr 5612  df-se 5613  df-we 5614  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-pred 6299  df-ord 6360  df-on 6361  df-lim 6362  df-suc 6363  df-iota 6489  df-fun 6535  df-fn 6536  df-f 6537  df-f1 6538  df-fo 6539  df-f1o 6540  df-fv 6541  df-isom 6542  df-riota 7365  df-ov 7411  df-oprab 7412  df-mpo 7413  df-of 7672  df-om 7859  df-1st 7982  df-2nd 7983  df-supp 8153  df-frecs 8274  df-wrecs 8305  df-recs 8354  df-rdg 8393  df-1o 8449  df-2o 8450  df-er 8690  df-map 8822  df-en 8940  df-dom 8941  df-sdom 8942  df-fin 8943  df-fsupp 9318  df-oi 9468  df-card 9921  df-pnf 11241  df-mnf 11242  df-xr 11243  df-ltxr 11244  df-le 11245  df-sub 11439  df-neg 11440  df-nn 12230  df-2 12299  df-n0 12501  df-z 12588  df-uz 12859  df-fz 13532  df-fzo 13679  df-seq 14034  df-hash 14363  df-sets 17220  df-slot 17238  df-ndx 17250  df-base 17266  df-ress 17287  df-plusg 17319  df-0g 17490  df-gsum 17491  df-mre 17634  df-mrc 17635  df-acs 17637  df-mgm 18694  df-sgrp 18773  df-mnd 18789  df-mhm 18837  df-submnd 18838  df-grp 18999  df-minusg 19000  df-sbg 19001  df-mulg 19130  df-ghm 19280  df-cntz 19383  df-cmn 19848  df-abl 19849  df-mgp 20213  df-rng 20227  df-ur 20260  df-ring 20313

This theorem is referenced by: (None)