Theorem fsumf1of 41862

Description: Re-index a finite sum using a bijection. Same as fsumf1o 15082, 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 3899	. . . 4 ⊢ (𝑘 = 𝑖 → 𝐵 = ⦋𝑖 / 𝑘⦌𝐵)
2		nfcv 2979	. . . 4 ⊢ Ⅎ𝑖𝐴
3		nfcv 2979	. . . 4 ⊢ Ⅎ𝑘𝐴
4		nfcv 2979	. . . 4 ⊢ Ⅎ𝑖𝐵
5		nfcsb1v 3909	. . . 4 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵
6	1, 2, 3, 4, 5	cbvsum 15054	. . 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 1915	. . . . 5 ⊢ Ⅎ𝑘 𝑖 = ⦋𝑗 / 𝑛⦌𝐺
9		nfcv 2979	. . . . . 6 ⊢ Ⅎ𝑘⦋𝑗 / 𝑛⦌𝐷
10	5, 9	nfeq 2993	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷
11	8, 10	nfim 1897	. . . 4 ⊢ Ⅎ𝑘(𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
12		eqeq1 2827	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 ↔ 𝑖 = ⦋𝑗 / 𝑛⦌𝐺))
13	1	eqeq1d 2825	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 = ⦋𝑗 / 𝑛⦌𝐷 ↔ ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
14	12, 13	imbi12d 347	. . . 4 ⊢ (𝑘 = 𝑖 → ((𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷) ↔ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
15		nfcv 2979	. . . . . . 7 ⊢ Ⅎ𝑛𝑘
16		nfcsb1v 3909	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐺
17	15, 16	nfeq 2993	. . . . . 6 ⊢ Ⅎ𝑛 𝑘 = ⦋𝑗 / 𝑛⦌𝐺
18		nfcv 2979	. . . . . . 7 ⊢ Ⅎ𝑛𝐵
19		nfcsb1v 3909	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐷
20	18, 19	nfeq 2993	. . . . . 6 ⊢ Ⅎ𝑛 𝐵 = ⦋𝑗 / 𝑛⦌𝐷
21	17, 20	nfim 1897	. . . . 5 ⊢ Ⅎ𝑛(𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
22		csbeq1a 3899	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐺 = ⦋𝑗 / 𝑛⦌𝐺)
23	22	eqeq2d 2834	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑘 = 𝐺 ↔ 𝑘 = ⦋𝑗 / 𝑛⦌𝐺))
24		csbeq1a 3899	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐷 = ⦋𝑗 / 𝑛⦌𝐷)
25	24	eqeq2d 2834	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐵 = 𝐷 ↔ 𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
26	23, 25	imbi12d 347	. . . . 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 2242	. . . 4 ⊢ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
29	11, 14, 28	chvarfv 2242	. . 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 1915	. . . . . 6 ⊢ Ⅎ𝑛 𝑗 ∈ 𝐶
34	32, 33	nfan 1900	. . . . 5 ⊢ Ⅎ𝑛(𝜑 ∧ 𝑗 ∈ 𝐶)
35		nfcv 2979	. . . . . 6 ⊢ Ⅎ𝑛(𝐹‘𝑗)
36	35, 16	nfeq 2993	. . . . 5 ⊢ Ⅎ𝑛(𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺
37	34, 36	nfim 1897	. . . 4 ⊢ Ⅎ𝑛((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
38		eleq1w 2897	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑛 ∈ 𝐶 ↔ 𝑗 ∈ 𝐶))
39	38	anbi2d 630	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝜑 ∧ 𝑛 ∈ 𝐶) ↔ (𝜑 ∧ 𝑗 ∈ 𝐶)))
40		fveq2 6672	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐹‘𝑛) = (𝐹‘𝑗))
41	40, 22	eqeq12d 2839	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝐹‘𝑛) = 𝐺 ↔ (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺))
42	39, 41	imbi12d 347	. . . 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 2242	. . 3 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
45		fsumf1of.1	. . . . . 6 ⊢ Ⅎ𝑘𝜑
46		nfv 1915	. . . . . 6 ⊢ Ⅎ𝑘 𝑖 ∈ 𝐴
47	45, 46	nfan 1900	. . . . 5 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝐴)
48	5	nfel1 2996	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ
49	47, 48	nfim 1897	. . . 4 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
50		eleq1w 2897	. . . . . 6 ⊢ (𝑘 = 𝑖 → (𝑘 ∈ 𝐴 ↔ 𝑖 ∈ 𝐴))
51	50	anbi2d 630	. . . . 5 ⊢ (𝑘 = 𝑖 → ((𝜑 ∧ 𝑘 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴)))
52	1	eleq1d 2899	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 ∈ ℂ ↔ ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ))
53	51, 52	imbi12d 347	. . . 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 2242	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
56	29, 30, 31, 44, 55	fsumf1o 15082	. 2 ⊢ (𝜑 → Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷)
57		nfcv 2979	. . . . 5 ⊢ Ⅎ𝑗𝐶
58		nfcv 2979	. . . . 5 ⊢ Ⅎ𝑛𝐶
59		nfcv 2979	. . . . 5 ⊢ Ⅎ𝑗𝐷
60	24, 57, 58, 59, 19	cbvsum 15054	. . . 4 ⊢ Σ𝑛 ∈ 𝐶 𝐷 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷
61	60	eqcomi 2832	. . 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 2862	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑛 ∈ 𝐶 𝐷)

Syntax hints:   → wi 4   ∧ wa 398   = wceq 1537  Ⅎwnf 1784   ∈ wcel 2114  ⦋csb 3885  –1-1-onto→wf1o 6356  ‘cfv 6357  Fincfn 8511  ℂcc 10537  Σcsu 15044

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 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-rep 5192  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332  ax-un 7463  ax-inf2 9106  ax-cnex 10595  ax-resscn 10596  ax-1cn 10597  ax-icn 10598  ax-addcl 10599  ax-addrcl 10600  ax-mulcl 10601  ax-mulrcl 10602  ax-mulcom 10603  ax-addass 10604  ax-mulass 10605  ax-distr 10606  ax-i2m1 10607  ax-1ne0 10608  ax-1rid 10609  ax-rnegex 10610  ax-rrecex 10611  ax-cnre 10612  ax-pre-lttri 10613  ax-pre-lttrn 10614  ax-pre-ltadd 10615  ax-pre-mulgt0 10616  ax-pre-sup 10617

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3or 1084  df-3an 1085  df-tru 1540  df-fal 1550  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ne 3019  df-nel 3126  df-ral 3145  df-rex 3146  df-reu 3147  df-rmo 3148  df-rab 3149  df-v 3498  df-sbc 3775  df-csb 3886  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-pss 3956  df-nul 4294  df-if 4470  df-pw 4543  df-sn 4570  df-pr 4572  df-tp 4574  df-op 4576  df-uni 4841  df-int 4879  df-iun 4923  df-br 5069  df-opab 5131  df-mpt 5149  df-tr 5175  df-id 5462  df-eprel 5467  df-po 5476  df-so 5477  df-fr 5516  df-se 5517  df-we 5518  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-res 5569  df-ima 5570  df-pred 6150  df-ord 6196  df-on 6197  df-lim 6198  df-suc 6199  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-f1 6362  df-fo 6363  df-f1o 6364  df-fv 6365  df-isom 6366  df-riota 7116  df-ov 7161  df-oprab 7162  df-mpo 7163  df-om 7583  df-1st 7691  df-2nd 7692  df-wrecs 7949  df-recs 8010  df-rdg 8048  df-1o 8104  df-oadd 8108  df-er 8291  df-en 8512  df-dom 8513  df-sdom 8514  df-fin 8515  df-sup 8908  df-oi 8976  df-card 9370  df-pnf 10679  df-mnf 10680  df-xr 10681  df-ltxr 10682  df-le 10683  df-sub 10874  df-neg 10875  df-div 11300  df-nn 11641  df-2 11703  df-3 11704  df-n0 11901  df-z 11985  df-uz 12247  df-rp 12393  df-fz 12896  df-fzo 13037  df-seq 13373  df-exp 13433  df-hash 13694  df-cj 14460  df-re 14461  df-im 14462  df-sqrt 14596  df-abs 14597  df-clim 14847  df-sum 15045

This theorem is referenced by:  sge0f1o  42671