Theorem gsummulsubdishift1s 33211

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 5201	. . . 4 ⊢ (𝑖 ∈ (0...𝑁) ↦ 𝑉) = (𝑘 ∈ (0...𝑁) ↦ 𝑃)
3	2	oveq2i 7402	. . 3 ⊢ (𝑅 Σg (𝑖 ∈ (0...𝑁) ↦ 𝑉)) = (𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃))
4	3	oveq1i 7401	. 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 7091	. . 3 ⊢ (𝜑 → (𝑖 ∈ (0...𝑁) ↦ 𝑉):(0...𝑁)⟶𝐵)
15		gsummulsubdishift1s.e	. . . 4 ⊢ (𝜑 → 𝐸 = ((𝐻 · 𝐴) − (𝐺 · 𝐶)))
16		eqid 2761	. . . . . . 7 ⊢ (𝑖 ∈ (0...𝑁) ↦ 𝑉) = (𝑖 ∈ (0...𝑁) ↦ 𝑉)
17		gsummulsubdishift1s.2	. . . . . . 7 ⊢ (𝑖 = 𝑁 → 𝑉 = 𝐻)
18		nn0fz0 13624	. . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 ↔ 𝑁 ∈ (0...𝑁))
19	12, 18	sylib 220	. . . . . . 7 ⊢ (𝜑 → 𝑁 ∈ (0...𝑁))
20	17	adantl 485	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 = 𝑁) → 𝑉 = 𝐻)
21	12, 20	csbied 3886	. . . . . . . 8 ⊢ (𝜑 → ⦋𝑁 / 𝑖⦌𝑉 = 𝐻)
22	13	ralrimiva 3153	. . . . . . . . 9 ⊢ (𝜑 → ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵)
23		rspcsbela 4389	. . . . . . . . 9 ⊢ ((𝑁 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋𝑁 / 𝑖⦌𝑉 ∈ 𝐵)
24	19, 22, 23	syl2anc 593	. . . . . . . 8 ⊢ (𝜑 → ⦋𝑁 / 𝑖⦌𝑉 ∈ 𝐵)
25	21, 24	eqeltrrd 2862	. . . . . . 7 ⊢ (𝜑 → 𝐻 ∈ 𝐵)
26	16, 17, 19, 25	fvmptd3 6994	. . . . . 6 ⊢ (𝜑 → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) = 𝐻)
27	26	oveq1d 7406	. . . . 5 ⊢ (𝜑 → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) · 𝐴) = (𝐻 · 𝐴))
28		gsummulsubdishift1s.1	. . . . . . 7 ⊢ (𝑖 = 0 → 𝑉 = 𝐺)
29		0elfz 13623	. . . . . . . 8 ⊢ (𝑁 ∈ ℕ0 → 0 ∈ (0...𝑁))
30	12, 29	syl 17	. . . . . . 7 ⊢ (𝜑 → 0 ∈ (0...𝑁))
31	28	adantl 485	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑖 = 0) → 𝑉 = 𝐺)
32	30, 31	csbied 3886	. . . . . . . 8 ⊢ (𝜑 → ⦋0 / 𝑖⦌𝑉 = 𝐺)
33		rspcsbela 4389	. . . . . . . . 9 ⊢ ((0 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋0 / 𝑖⦌𝑉 ∈ 𝐵)
34	30, 22, 33	syl2anc 593	. . . . . . . 8 ⊢ (𝜑 → ⦋0 / 𝑖⦌𝑉 ∈ 𝐵)
35	32, 34	eqeltrrd 2862	. . . . . . 7 ⊢ (𝜑 → 𝐺 ∈ 𝐵)
36	16, 28, 30, 35	fvmptd3 6994	. . . . . 6 ⊢ (𝜑 → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) = 𝐺)
37	36	oveq1d 7406	. . . . 5 ⊢ (𝜑 → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) · 𝐶) = (𝐺 · 𝐶))
38	27, 37	oveq12d 7409	. . . 4 ⊢ (𝜑 → ((((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑁) · 𝐴) − (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘0) · 𝐶)) = ((𝐻 · 𝐴) − (𝐺 · 𝐶)))
39	15, 38	eqtr4d 2799	. . 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 13678	. . . . . . . 8 ⊢ (0..^𝑁) ⊆ (0...𝑁)
42		simpr 488	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑘 ∈ (0..^𝑁))
43	41, 42	sselid 3932	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑘 ∈ (0...𝑁))
44	1	adantl 485	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) ∧ 𝑖 = 𝑘) → 𝑉 = 𝑃)
45	42, 44	csbied 3886	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋𝑘 / 𝑖⦌𝑉 = 𝑃)
46	22	adantr 484	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵)
47		rspcsbela 4389	. . . . . . . . 9 ⊢ ((𝑘 ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋𝑘 / 𝑖⦌𝑉 ∈ 𝐵)
48	43, 46, 47	syl2anc 593	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋𝑘 / 𝑖⦌𝑉 ∈ 𝐵)
49	45, 48	eqeltrrd 2862	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑃 ∈ 𝐵)
50	16, 1, 43, 49	fvmptd3 6994	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) = 𝑃)
51	50	oveq1d 7406	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘𝑘) · 𝐴) = (𝑃 · 𝐴))
52		gsummulsubdishift1s.4	. . . . . . 7 ⊢ (𝑖 = (𝑘 + 1) → 𝑉 = 𝑄)
53		fzofzp1 13764	. . . . . . . 8 ⊢ (𝑘 ∈ (0..^𝑁) → (𝑘 + 1) ∈ (0...𝑁))
54	53	adantl 485	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (𝑘 + 1) ∈ (0...𝑁))
55	52	adantl 485	. . . . . . . . 9 ⊢ (((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) ∧ 𝑖 = (𝑘 + 1)) → 𝑉 = 𝑄)
56	54, 55	csbied 3886	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 = 𝑄)
57		rspcsbela 4389	. . . . . . . . 9 ⊢ (((𝑘 + 1) ∈ (0...𝑁) ∧ ∀𝑖 ∈ (0...𝑁)𝑉 ∈ 𝐵) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 ∈ 𝐵)
58	54, 46, 57	syl2anc 593	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ⦋(𝑘 + 1) / 𝑖⦌𝑉 ∈ 𝐵)
59	56, 58	eqeltrrd 2862	. . . . . . 7 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → 𝑄 ∈ 𝐵)
60	16, 52, 54, 59	fvmptd3 6994	. . . . . 6 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → ((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) = 𝑄)
61	60	oveq1d 7406	. . . . 5 ⊢ ((𝜑 ∧ 𝑘 ∈ (0..^𝑁)) → (((𝑖 ∈ (0...𝑁) ↦ 𝑉)‘(𝑘 + 1)) · 𝐶) = (𝑄 · 𝐶))
62	51, 61	oveq12d 7409	. . . 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 2799	. . 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 33209	. 2 ⊢ (𝜑 → ((𝑅 Σg (𝑖 ∈ (0...𝑁) ↦ 𝑉)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0..^𝑁) ↦ 𝐹)) + 𝐸))
65	4, 64	eqtr3id 2810	1 ⊢ (𝜑 → ((𝑅 Σg (𝑘 ∈ (0...𝑁) ↦ 𝑃)) · (𝐴 − 𝐶)) = ((𝑅 Σg (𝑘 ∈ (0..^𝑁) ↦ 𝐹)) + 𝐸))

Syntax hints:   → wi 4   ∧ wa 399   = wceq 1559   ∈ wcel 2141  ∀wral 3075  ⦋csb 3850   ↦ cmpt 5178  ‘cfv 6516  (class class class)co 7391  0cc0 11067  1c1 11068   + caddc 11070  ℕ₀cn0 12475  ...cfz 13506  ..^cfzo 13653  Basecbs 17236  +_gcplusg 17277  ._rcmulr 17278   Σ_g cgsu 17460  -_gcsg 18968  Ringcrg 20270

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 5224  ax-sep 5243  ax-nul 5253  ax-pow 5319  ax-pr 5387  ax-un 7713  ax-cnex 11123  ax-resscn 11124  ax-1cn 11125  ax-icn 11126  ax-addcl 11127  ax-addrcl 11128  ax-mulcl 11129  ax-mulrcl 11130  ax-mulcom 11131  ax-addass 11132  ax-mulass 11133  ax-distr 11134  ax-i2m1 11135  ax-1ne0 11136  ax-1rid 11137  ax-rnegex 11138  ax-rrecex 11139  ax-cnre 11140  ax-pre-lttri 11141  ax-pre-lttrn 11142  ax-pre-ltadd 11143  ax-pre-mulgt0 11144

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 3743  df-csb 3851  df-dif 3905  df-un 3907  df-in 3909  df-ss 3919  df-pss 3922  df-nul 4284  df-if 4478  df-pw 4554  df-sn 4580  df-pr 4582  df-op 4586  df-uni 4863  df-int 4903  df-iun 4948  df-iin 4949  df-br 5098  df-opab 5160  df-mpt 5179  df-tr 5205  df-id 5538  df-eprel 5543  df-po 5551  df-so 5552  df-fr 5596  df-se 5597  df-we 5598  df-xp 5649  df-rel 5650  df-cnv 5651  df-co 5652  df-dm 5653  df-rn 5654  df-res 5655  df-ima 5656  df-pred 6283  df-ord 6344  df-on 6345  df-lim 6346  df-suc 6347  df-iota 6472  df-fun 6518  df-fn 6519  df-f 6520  df-f1 6521  df-fo 6522  df-f1o 6523  df-fv 6524  df-isom 6525  df-riota 7348  df-ov 7394  df-oprab 7395  df-mpo 7396  df-of 7655  df-om 7842  df-1st 7965  df-2nd 7966  df-supp 8135  df-frecs 8256  df-wrecs 8287  df-recs 8336  df-rdg 8375  df-1o 8431  df-2o 8432  df-er 8672  df-map 8804  df-en 8922  df-dom 8923  df-sdom 8924  df-fin 8925  df-fsupp 9302  df-oi 9452  df-card 9891  df-pnf 11212  df-mnf 11213  df-xr 11214  df-ltxr 11215  df-le 11216  df-sub 11410  df-neg 11411  df-nn 12205  df-2 12274  df-n0 12476  df-z 12563  df-uz 12834  df-fz 13507  df-fzo 13654  df-seq 14009  df-hash 14338  df-sets 17191  df-slot 17209  df-ndx 17221  df-base 17237  df-ress 17258  df-plusg 17290  df-0g 17461  df-gsum 17462  df-mre 17605  df-mrc 17606  df-acs 17608  df-mgm 18665  df-sgrp 18744  df-mnd 18760  df-mhm 18808  df-submnd 18809  df-grp 18969  df-minusg 18970  df-sbg 18971  df-mulg 19101  df-ghm 19245  df-cntz 19348  df-cmn 19813  df-abl 19814  df-mgp 20178  df-rng 20190  df-ur 20219  df-ring 20272

This theorem is referenced by: (None)