Theorem fsumf1of 45575

Description: Re-index a finite sum using a bijection. Same as fsumf1o 15630, but using bound-variable hypotheses instead of distinct variable conditions. (Contributed by Glauco Siliprandi, 17-Aug-2020.)

Hypotheses

Ref	Expression
fsumf1of.1	⊢ Ⅎ𝑘𝜑
fsumf1of.2	⊢ Ⅎ𝑛𝜑
fsumf1of.3	⊢ (𝑘 = 𝐺 → 𝐵 = 𝐷)
fsumf1of.4	⊢ (𝜑 → 𝐶 ∈ Fin)
fsumf1of.5	⊢ (𝜑 → 𝐹:𝐶–1-1-onto→𝐴)
fsumf1of.6	⊢ ((𝜑 ∧ 𝑛 ∈ 𝐶) → (𝐹‘𝑛) = 𝐺)
fsumf1of.7	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ)

Assertion

Ref	Expression
fsumf1of	⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑛 ∈ 𝐶 𝐷)

Distinct variable groups:   𝐴,𝑘   𝐵,𝑛   𝐶,𝑛   𝐷,𝑘   𝑛,𝐹   𝑘,𝐺   𝑘,𝑛

Allowed substitution hints:   𝜑(𝑘,𝑛)   𝐴(𝑛)   𝐵(𝑘)   𝐶(𝑘)   𝐷(𝑛)   𝐹(𝑘)   𝐺(𝑛)

Proof of Theorem fsumf1of

Dummy variables 𝑖 𝑗 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		csbeq1a 3865	. . . 4 ⊢ (𝑘 = 𝑖 → 𝐵 = ⦋𝑖 / 𝑘⦌𝐵)
2		nfcv 2891	. . . 4 ⊢ Ⅎ𝑖𝐵
3		nfcsb1v 3875	. . . 4 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵
4	1, 2, 3	cbvsum 15602	. . 3 ⊢ Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵
5	4	a1i 11	. 2 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵)
6		nfv 1914	. . . . 5 ⊢ Ⅎ𝑘 𝑖 = ⦋𝑗 / 𝑛⦌𝐺
7		nfcv 2891	. . . . . 6 ⊢ Ⅎ𝑘⦋𝑗 / 𝑛⦌𝐷
8	3, 7	nfeq 2905	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷
9	6, 8	nfim 1896	. . . 4 ⊢ Ⅎ𝑘(𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
10		eqeq1 2733	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 ↔ 𝑖 = ⦋𝑗 / 𝑛⦌𝐺))
11	1	eqeq1d 2731	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 = ⦋𝑗 / 𝑛⦌𝐷 ↔ ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
12	10, 11	imbi12d 344	. . . 4 ⊢ (𝑘 = 𝑖 → ((𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷) ↔ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
13		nfcv 2891	. . . . . . 7 ⊢ Ⅎ𝑛𝑘
14		nfcsb1v 3875	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐺
15	13, 14	nfeq 2905	. . . . . 6 ⊢ Ⅎ𝑛 𝑘 = ⦋𝑗 / 𝑛⦌𝐺
16		nfcv 2891	. . . . . . 7 ⊢ Ⅎ𝑛𝐵
17		nfcsb1v 3875	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐷
18	16, 17	nfeq 2905	. . . . . 6 ⊢ Ⅎ𝑛 𝐵 = ⦋𝑗 / 𝑛⦌𝐷
19	15, 18	nfim 1896	. . . . 5 ⊢ Ⅎ𝑛(𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
20		csbeq1a 3865	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐺 = ⦋𝑗 / 𝑛⦌𝐺)
21	20	eqeq2d 2740	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑘 = 𝐺 ↔ 𝑘 = ⦋𝑗 / 𝑛⦌𝐺))
22		csbeq1a 3865	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐷 = ⦋𝑗 / 𝑛⦌𝐷)
23	22	eqeq2d 2740	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐵 = 𝐷 ↔ 𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
24	21, 23	imbi12d 344	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝑘 = 𝐺 → 𝐵 = 𝐷) ↔ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
25		fsumf1of.3	. . . . 5 ⊢ (𝑘 = 𝐺 → 𝐵 = 𝐷)
26	19, 24, 25	chvarfv 2241	. . . 4 ⊢ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
27	9, 12, 26	chvarfv 2241	. . 3 ⊢ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
28		fsumf1of.4	. . 3 ⊢ (𝜑 → 𝐶 ∈ Fin)
29		fsumf1of.5	. . 3 ⊢ (𝜑 → 𝐹:𝐶–1-1-onto→𝐴)
30		fsumf1of.2	. . . . . 6 ⊢ Ⅎ𝑛𝜑
31		nfv 1914	. . . . . 6 ⊢ Ⅎ𝑛 𝑗 ∈ 𝐶
32	30, 31	nfan 1899	. . . . 5 ⊢ Ⅎ𝑛(𝜑 ∧ 𝑗 ∈ 𝐶)
33		nfcv 2891	. . . . . 6 ⊢ Ⅎ𝑛(𝐹‘𝑗)
34	33, 14	nfeq 2905	. . . . 5 ⊢ Ⅎ𝑛(𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺
35	32, 34	nfim 1896	. . . 4 ⊢ Ⅎ𝑛((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
36		eleq1w 2811	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑛 ∈ 𝐶 ↔ 𝑗 ∈ 𝐶))
37	36	anbi2d 630	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝜑 ∧ 𝑛 ∈ 𝐶) ↔ (𝜑 ∧ 𝑗 ∈ 𝐶)))
38		fveq2 6822	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐹‘𝑛) = (𝐹‘𝑗))
39	38, 20	eqeq12d 2745	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝐹‘𝑛) = 𝐺 ↔ (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺))
40	37, 39	imbi12d 344	. . . 4 ⊢ (𝑛 = 𝑗 → (((𝜑 ∧ 𝑛 ∈ 𝐶) → (𝐹‘𝑛) = 𝐺) ↔ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)))
41		fsumf1of.6	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ 𝐶) → (𝐹‘𝑛) = 𝐺)
42	35, 40, 41	chvarfv 2241	. . 3 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
43		fsumf1of.1	. . . . . 6 ⊢ Ⅎ𝑘𝜑
44		nfv 1914	. . . . . 6 ⊢ Ⅎ𝑘 𝑖 ∈ 𝐴
45	43, 44	nfan 1899	. . . . 5 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝐴)
46	3	nfel1 2908	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ
47	45, 46	nfim 1896	. . . 4 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
48		eleq1w 2811	. . . . . 6 ⊢ (𝑘 = 𝑖 → (𝑘 ∈ 𝐴 ↔ 𝑖 ∈ 𝐴))
49	48	anbi2d 630	. . . . 5 ⊢ (𝑘 = 𝑖 → ((𝜑 ∧ 𝑘 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴)))
50	1	eleq1d 2813	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 ∈ ℂ ↔ ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ))
51	49, 50	imbi12d 344	. . . 4 ⊢ (𝑘 = 𝑖 → (((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ) ↔ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)))
52		fsumf1of.7	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ)
53	47, 51, 52	chvarfv 2241	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
54	27, 28, 29, 42, 53	fsumf1o 15630	. 2 ⊢ (𝜑 → Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷)
55		nfcv 2891	. . . . 5 ⊢ Ⅎ𝑗𝐷
56	22, 55, 17	cbvsum 15602	. . . 4 ⊢ Σ𝑛 ∈ 𝐶 𝐷 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷
57	56	eqcomi 2738	. . 3 ⊢ Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷 = Σ𝑛 ∈ 𝐶 𝐷
58	57	a1i 11	. 2 ⊢ (𝜑 → Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷 = Σ𝑛 ∈ 𝐶 𝐷)
59	5, 54, 58	3eqtrd 2768	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑛 ∈ 𝐶 𝐷)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1540  Ⅎwnf 1783   ∈ wcel 2109  ⦋csb 3851  –1-1-onto→wf1o 6481  ‘cfv 6482  Fincfn 8872  ℂcc 11007  Σcsu 15593

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-10 2142  ax-11 2158  ax-12 2178  ax-ext 2701  ax-rep 5218  ax-sep 5235  ax-nul 5245  ax-pow 5304  ax-pr 5371  ax-un 7671  ax-inf2 9537  ax-cnex 11065  ax-resscn 11066  ax-1cn 11067  ax-icn 11068  ax-addcl 11069  ax-addrcl 11070  ax-mulcl 11071  ax-mulrcl 11072  ax-mulcom 11073  ax-addass 11074  ax-mulass 11075  ax-distr 11076  ax-i2m1 11077  ax-1ne0 11078  ax-1rid 11079  ax-rnegex 11080  ax-rrecex 11081  ax-cnre 11082  ax-pre-lttri 11083  ax-pre-lttrn 11084  ax-pre-ltadd 11085  ax-pre-mulgt0 11086  ax-pre-sup 11087

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3or 1087  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-nf 1784  df-sb 2066  df-mo 2533  df-eu 2562  df-clab 2708  df-cleq 2721  df-clel 2803  df-nfc 2878  df-ne 2926  df-nel 3030  df-ral 3045  df-rex 3054  df-rmo 3343  df-reu 3344  df-rab 3395  df-v 3438  df-sbc 3743  df-csb 3852  df-dif 3906  df-un 3908  df-in 3910  df-ss 3920  df-pss 3923  df-nul 4285  df-if 4477  df-pw 4553  df-sn 4578  df-pr 4580  df-op 4584  df-uni 4859  df-int 4897  df-iun 4943  df-br 5093  df-opab 5155  df-mpt 5174  df-tr 5200  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 6249  df-ord 6310  df-on 6311  df-lim 6312  df-suc 6313  df-iota 6438  df-fun 6484  df-fn 6485  df-f 6486  df-f1 6487  df-fo 6488  df-f1o 6489  df-fv 6490  df-isom 6491  df-riota 7306  df-ov 7352  df-oprab 7353  df-mpo 7354  df-om 7800  df-1st 7924  df-2nd 7925  df-frecs 8214  df-wrecs 8245  df-recs 8294  df-rdg 8332  df-1o 8388  df-er 8625  df-en 8873  df-dom 8874  df-sdom 8875  df-fin 8876  df-sup 9332  df-oi 9402  df-card 9835  df-pnf 11151  df-mnf 11152  df-xr 11153  df-ltxr 11154  df-le 11155  df-sub 11349  df-neg 11350  df-div 11778  df-nn 12129  df-2 12191  df-3 12192  df-n0 12385  df-z 12472  df-uz 12736  df-rp 12894  df-fz 13411  df-fzo 13558  df-seq 13909  df-exp 13969  df-hash 14238  df-cj 15006  df-re 15007  df-im 15008  df-sqrt 15142  df-abs 15143  df-clim 15395  df-sum 15594

This theorem is referenced by:  sge0f1o  46383