Theorem fsumf1of 43005

Description: Re-index a finite sum using a bijection. Same as fsumf1o 15363, 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 3842	. . . 4 ⊢ (𝑘 = 𝑖 → 𝐵 = ⦋𝑖 / 𝑘⦌𝐵)
2		nfcv 2906	. . . 4 ⊢ Ⅎ𝑖𝐴
3		nfcv 2906	. . . 4 ⊢ Ⅎ𝑘𝐴
4		nfcv 2906	. . . 4 ⊢ Ⅎ𝑖𝐵
5		nfcsb1v 3853	. . . 4 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵
6	1, 2, 3, 4, 5	cbvsum 15335	. . 3 ⊢ Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵
7	6	a1i 11	. 2 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵)
8		nfv 1918	. . . . 5 ⊢ Ⅎ𝑘 𝑖 = ⦋𝑗 / 𝑛⦌𝐺
9		nfcv 2906	. . . . . 6 ⊢ Ⅎ𝑘⦋𝑗 / 𝑛⦌𝐷
10	5, 9	nfeq 2919	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷
11	8, 10	nfim 1900	. . . 4 ⊢ Ⅎ𝑘(𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
12		eqeq1 2742	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 ↔ 𝑖 = ⦋𝑗 / 𝑛⦌𝐺))
13	1	eqeq1d 2740	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 = ⦋𝑗 / 𝑛⦌𝐷 ↔ ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
14	12, 13	imbi12d 344	. . . 4 ⊢ (𝑘 = 𝑖 → ((𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷) ↔ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
15		nfcv 2906	. . . . . . 7 ⊢ Ⅎ𝑛𝑘
16		nfcsb1v 3853	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐺
17	15, 16	nfeq 2919	. . . . . 6 ⊢ Ⅎ𝑛 𝑘 = ⦋𝑗 / 𝑛⦌𝐺
18		nfcv 2906	. . . . . . 7 ⊢ Ⅎ𝑛𝐵
19		nfcsb1v 3853	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐷
20	18, 19	nfeq 2919	. . . . . 6 ⊢ Ⅎ𝑛 𝐵 = ⦋𝑗 / 𝑛⦌𝐷
21	17, 20	nfim 1900	. . . . 5 ⊢ Ⅎ𝑛(𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
22		csbeq1a 3842	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐺 = ⦋𝑗 / 𝑛⦌𝐺)
23	22	eqeq2d 2749	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑘 = 𝐺 ↔ 𝑘 = ⦋𝑗 / 𝑛⦌𝐺))
24		csbeq1a 3842	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐷 = ⦋𝑗 / 𝑛⦌𝐷)
25	24	eqeq2d 2749	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐵 = 𝐷 ↔ 𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
26	23, 25	imbi12d 344	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝑘 = 𝐺 → 𝐵 = 𝐷) ↔ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
27		fsumf1of.3	. . . . 5 ⊢ (𝑘 = 𝐺 → 𝐵 = 𝐷)
28	21, 26, 27	chvarfv 2236	. . . 4 ⊢ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
29	11, 14, 28	chvarfv 2236	. . 3 ⊢ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
30		fsumf1of.4	. . 3 ⊢ (𝜑 → 𝐶 ∈ Fin)
31		fsumf1of.5	. . 3 ⊢ (𝜑 → 𝐹:𝐶–1-1-onto→𝐴)
32		fsumf1of.2	. . . . . 6 ⊢ Ⅎ𝑛𝜑
33		nfv 1918	. . . . . 6 ⊢ Ⅎ𝑛 𝑗 ∈ 𝐶
34	32, 33	nfan 1903	. . . . 5 ⊢ Ⅎ𝑛(𝜑 ∧ 𝑗 ∈ 𝐶)
35		nfcv 2906	. . . . . 6 ⊢ Ⅎ𝑛(𝐹‘𝑗)
36	35, 16	nfeq 2919	. . . . 5 ⊢ Ⅎ𝑛(𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺
37	34, 36	nfim 1900	. . . 4 ⊢ Ⅎ𝑛((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
38		eleq1w 2821	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑛 ∈ 𝐶 ↔ 𝑗 ∈ 𝐶))
39	38	anbi2d 628	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝜑 ∧ 𝑛 ∈ 𝐶) ↔ (𝜑 ∧ 𝑗 ∈ 𝐶)))
40		fveq2 6756	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐹‘𝑛) = (𝐹‘𝑗))
41	40, 22	eqeq12d 2754	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝐹‘𝑛) = 𝐺 ↔ (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺))
42	39, 41	imbi12d 344	. . . 4 ⊢ (𝑛 = 𝑗 → (((𝜑 ∧ 𝑛 ∈ 𝐶) → (𝐹‘𝑛) = 𝐺) ↔ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)))
43		fsumf1of.6	. . . 4 ⊢ ((𝜑 ∧ 𝑛 ∈ 𝐶) → (𝐹‘𝑛) = 𝐺)
44	37, 42, 43	chvarfv 2236	. . 3 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
45		fsumf1of.1	. . . . . 6 ⊢ Ⅎ𝑘𝜑
46		nfv 1918	. . . . . 6 ⊢ Ⅎ𝑘 𝑖 ∈ 𝐴
47	45, 46	nfan 1903	. . . . 5 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝐴)
48	5	nfel1 2922	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ
49	47, 48	nfim 1900	. . . 4 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
50		eleq1w 2821	. . . . . 6 ⊢ (𝑘 = 𝑖 → (𝑘 ∈ 𝐴 ↔ 𝑖 ∈ 𝐴))
51	50	anbi2d 628	. . . . 5 ⊢ (𝑘 = 𝑖 → ((𝜑 ∧ 𝑘 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴)))
52	1	eleq1d 2823	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 ∈ ℂ ↔ ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ))
53	51, 52	imbi12d 344	. . . 4 ⊢ (𝑘 = 𝑖 → (((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ) ↔ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)))
54		fsumf1of.7	. . . 4 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐵 ∈ ℂ)
55	49, 53, 54	chvarfv 2236	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
56	29, 30, 31, 44, 55	fsumf1o 15363	. 2 ⊢ (𝜑 → Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷)
57		nfcv 2906	. . . . 5 ⊢ Ⅎ𝑗𝐶
58		nfcv 2906	. . . . 5 ⊢ Ⅎ𝑛𝐶
59		nfcv 2906	. . . . 5 ⊢ Ⅎ𝑗𝐷
60	24, 57, 58, 59, 19	cbvsum 15335	. . . 4 ⊢ Σ𝑛 ∈ 𝐶 𝐷 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷
61	60	eqcomi 2747	. . 3 ⊢ Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷 = Σ𝑛 ∈ 𝐶 𝐷
62	61	a1i 11	. 2 ⊢ (𝜑 → Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷 = Σ𝑛 ∈ 𝐶 𝐷)
63	7, 56, 62	3eqtrd 2782	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑛 ∈ 𝐶 𝐷)

Syntax hints:   → wi 4   ∧ wa 395   = wceq 1539  Ⅎwnf 1787   ∈ wcel 2108  ⦋csb 3828  –1-1-onto→wf1o 6417  ‘cfv 6418  Fincfn 8691  ℂcc 10800  Σcsu 15325

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1799  ax-4 1813  ax-5 1914  ax-6 1972  ax-7 2012  ax-8 2110  ax-9 2118  ax-10 2139  ax-11 2156  ax-12 2173  ax-ext 2709  ax-rep 5205  ax-sep 5218  ax-nul 5225  ax-pow 5283  ax-pr 5347  ax-un 7566  ax-inf2 9329  ax-cnex 10858  ax-resscn 10859  ax-1cn 10860  ax-icn 10861  ax-addcl 10862  ax-addrcl 10863  ax-mulcl 10864  ax-mulrcl 10865  ax-mulcom 10866  ax-addass 10867  ax-mulass 10868  ax-distr 10869  ax-i2m1 10870  ax-1ne0 10871  ax-1rid 10872  ax-rnegex 10873  ax-rrecex 10874  ax-cnre 10875  ax-pre-lttri 10876  ax-pre-lttrn 10877  ax-pre-ltadd 10878  ax-pre-mulgt0 10879  ax-pre-sup 10880

This theorem depends on definitions:  df-bi 206  df-an 396  df-or 844  df-3or 1086  df-3an 1087  df-tru 1542  df-fal 1552  df-ex 1784  df-nf 1788  df-sb 2069  df-mo 2540  df-eu 2569  df-clab 2716  df-cleq 2730  df-clel 2817  df-nfc 2888  df-ne 2943  df-nel 3049  df-ral 3068  df-rex 3069  df-reu 3070  df-rmo 3071  df-rab 3072  df-v 3424  df-sbc 3712  df-csb 3829  df-dif 3886  df-un 3888  df-in 3890  df-ss 3900  df-pss 3902  df-nul 4254  df-if 4457  df-pw 4532  df-sn 4559  df-pr 4561  df-tp 4563  df-op 4565  df-uni 4837  df-int 4877  df-iun 4923  df-br 5071  df-opab 5133  df-mpt 5154  df-tr 5188  df-id 5480  df-eprel 5486  df-po 5494  df-so 5495  df-fr 5535  df-se 5536  df-we 5537  df-xp 5586  df-rel 5587  df-cnv 5588  df-co 5589  df-dm 5590  df-rn 5591  df-res 5592  df-ima 5593  df-pred 6191  df-ord 6254  df-on 6255  df-lim 6256  df-suc 6257  df-iota 6376  df-fun 6420  df-fn 6421  df-f 6422  df-f1 6423  df-fo 6424  df-f1o 6425  df-fv 6426  df-isom 6427  df-riota 7212  df-ov 7258  df-oprab 7259  df-mpo 7260  df-om 7688  df-1st 7804  df-2nd 7805  df-frecs 8068  df-wrecs 8099  df-recs 8173  df-rdg 8212  df-1o 8267  df-er 8456  df-en 8692  df-dom 8693  df-sdom 8694  df-fin 8695  df-sup 9131  df-oi 9199  df-card 9628  df-pnf 10942  df-mnf 10943  df-xr 10944  df-ltxr 10945  df-le 10946  df-sub 11137  df-neg 11138  df-div 11563  df-nn 11904  df-2 11966  df-3 11967  df-n0 12164  df-z 12250  df-uz 12512  df-rp 12660  df-fz 13169  df-fzo 13312  df-seq 13650  df-exp 13711  df-hash 13973  df-cj 14738  df-re 14739  df-im 14740  df-sqrt 14874  df-abs 14875  df-clim 15125  df-sum 15326

This theorem is referenced by:  sge0f1o  43810