Theorem fsumf1of 46149

Description: Re-index a finite sum using a bijection. Same as fsumf1o 15762, 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 3869	. . . 4 ⊢ (𝑘 = 𝑖 → 𝐵 = ⦋𝑖 / 𝑘⦌𝐵)
2		nfcv 2927	. . . 4 ⊢ Ⅎ𝑖𝐵
3		nfcsb1v 3879	. . . 4 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵
4	1, 2, 3	cbvsum 15734	. . 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 1937	. . . . 5 ⊢ Ⅎ𝑘 𝑖 = ⦋𝑗 / 𝑛⦌𝐺
7		nfcv 2927	. . . . . 6 ⊢ Ⅎ𝑘⦋𝑗 / 𝑛⦌𝐷
8	3, 7	nfeq 2940	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷
9	6, 8	nfim 1919	. . . 4 ⊢ Ⅎ𝑘(𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
10		eqeq1 2769	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 ↔ 𝑖 = ⦋𝑗 / 𝑛⦌𝐺))
11	1	eqeq1d 2767	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 = ⦋𝑗 / 𝑛⦌𝐷 ↔ ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
12	10, 11	imbi12d 347	. . . 4 ⊢ (𝑘 = 𝑖 → ((𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷) ↔ (𝑖 = ⦋𝑗 / 𝑛⦌𝐺 → ⦋𝑖 / 𝑘⦌𝐵 = ⦋𝑗 / 𝑛⦌𝐷)))
13		nfcv 2927	. . . . . . 7 ⊢ Ⅎ𝑛𝑘
14		nfcsb1v 3879	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐺
15	13, 14	nfeq 2940	. . . . . 6 ⊢ Ⅎ𝑛 𝑘 = ⦋𝑗 / 𝑛⦌𝐺
16		nfcv 2927	. . . . . . 7 ⊢ Ⅎ𝑛𝐵
17		nfcsb1v 3879	. . . . . . 7 ⊢ Ⅎ𝑛⦋𝑗 / 𝑛⦌𝐷
18	16, 17	nfeq 2940	. . . . . 6 ⊢ Ⅎ𝑛 𝐵 = ⦋𝑗 / 𝑛⦌𝐷
19	15, 18	nfim 1919	. . . . 5 ⊢ Ⅎ𝑛(𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
20		csbeq1a 3869	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐺 = ⦋𝑗 / 𝑛⦌𝐺)
21	20	eqeq2d 2776	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑘 = 𝐺 ↔ 𝑘 = ⦋𝑗 / 𝑛⦌𝐺))
22		csbeq1a 3869	. . . . . . 7 ⊢ (𝑛 = 𝑗 → 𝐷 = ⦋𝑗 / 𝑛⦌𝐷)
23	22	eqeq2d 2776	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐵 = 𝐷 ↔ 𝐵 = ⦋𝑗 / 𝑛⦌𝐷))
24	21, 23	imbi12d 347	. . . . 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 2278	. . . 4 ⊢ (𝑘 = ⦋𝑗 / 𝑛⦌𝐺 → 𝐵 = ⦋𝑗 / 𝑛⦌𝐷)
27	9, 12, 26	chvarfv 2278	. . 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 1937	. . . . . 6 ⊢ Ⅎ𝑛 𝑗 ∈ 𝐶
32	30, 31	nfan 1922	. . . . 5 ⊢ Ⅎ𝑛(𝜑 ∧ 𝑗 ∈ 𝐶)
33		nfcv 2927	. . . . . 6 ⊢ Ⅎ𝑛(𝐹‘𝑗)
34	33, 14	nfeq 2940	. . . . 5 ⊢ Ⅎ𝑛(𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺
35	32, 34	nfim 1919	. . . 4 ⊢ Ⅎ𝑛((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
36		eleq1w 2848	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝑛 ∈ 𝐶 ↔ 𝑗 ∈ 𝐶))
37	36	anbi2d 641	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝜑 ∧ 𝑛 ∈ 𝐶) ↔ (𝜑 ∧ 𝑗 ∈ 𝐶)))
38		fveq2 6871	. . . . . 6 ⊢ (𝑛 = 𝑗 → (𝐹‘𝑛) = (𝐹‘𝑗))
39	38, 20	eqeq12d 2781	. . . . 5 ⊢ (𝑛 = 𝑗 → ((𝐹‘𝑛) = 𝐺 ↔ (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺))
40	37, 39	imbi12d 347	. . . 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 2278	. . 3 ⊢ ((𝜑 ∧ 𝑗 ∈ 𝐶) → (𝐹‘𝑗) = ⦋𝑗 / 𝑛⦌𝐺)
43		fsumf1of.1	. . . . . 6 ⊢ Ⅎ𝑘𝜑
44		nfv 1937	. . . . . 6 ⊢ Ⅎ𝑘 𝑖 ∈ 𝐴
45	43, 44	nfan 1922	. . . . 5 ⊢ Ⅎ𝑘(𝜑 ∧ 𝑖 ∈ 𝐴)
46	3	nfel1 2943	. . . . 5 ⊢ Ⅎ𝑘⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ
47	45, 46	nfim 1919	. . . 4 ⊢ Ⅎ𝑘((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
48		eleq1w 2848	. . . . . 6 ⊢ (𝑘 = 𝑖 → (𝑘 ∈ 𝐴 ↔ 𝑖 ∈ 𝐴))
49	48	anbi2d 641	. . . . 5 ⊢ (𝑘 = 𝑖 → ((𝜑 ∧ 𝑘 ∈ 𝐴) ↔ (𝜑 ∧ 𝑖 ∈ 𝐴)))
50	1	eleq1d 2850	. . . . 5 ⊢ (𝑘 = 𝑖 → (𝐵 ∈ ℂ ↔ ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ))
51	49, 50	imbi12d 347	. . . 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 2278	. . 3 ⊢ ((𝜑 ∧ 𝑖 ∈ 𝐴) → ⦋𝑖 / 𝑘⦌𝐵 ∈ ℂ)
54	27, 28, 29, 42, 53	fsumf1o 15762	. 2 ⊢ (𝜑 → Σ𝑖 ∈ 𝐴 ⦋𝑖 / 𝑘⦌𝐵 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷)
55		nfcv 2927	. . . . 5 ⊢ Ⅎ𝑗𝐷
56	22, 55, 17	cbvsum 15734	. . . 4 ⊢ Σ𝑛 ∈ 𝐶 𝐷 = Σ𝑗 ∈ 𝐶 ⦋𝑗 / 𝑛⦌𝐷
57	56	eqcomi 2774	. . 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 2804	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐵 = Σ𝑛 ∈ 𝐶 𝐷)

Syntax hints:   → wi 4   ∧ wa 400   = wceq 1563  Ⅎwnf 1806   ∈ wcel 2145  ⦋csb 3855  –1-1-onto→wf1o 6524  ‘cfv 6525  Fincfn 8931  ℂcc 11086  Σcsu 15725

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1818  ax-4 1832  ax-5 1933  ax-6 1990  ax-7 2031  ax-8 2147  ax-9 2155  ax-10 2178  ax-11 2194  ax-12 2215  ax-ext 2737  ax-rep 5231  ax-sep 5250  ax-nul 5260  ax-pow 5326  ax-pr 5394  ax-un 7722  ax-inf2 9598  ax-cnex 11144  ax-resscn 11145  ax-1cn 11146  ax-icn 11147  ax-addcl 11148  ax-addrcl 11149  ax-mulcl 11150  ax-mulrcl 11151  ax-mulcom 11152  ax-addass 11153  ax-mulass 11154  ax-distr 11155  ax-i2m1 11156  ax-1ne0 11157  ax-1rid 11158  ax-rnegex 11159  ax-rrecex 11160  ax-cnre 11161  ax-pre-lttri 11162  ax-pre-lttrn 11163  ax-pre-ltadd 11164  ax-pre-mulgt0 11165  ax-pre-sup 11166

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1566  df-fal 1576  df-ex 1803  df-nf 1807  df-sb 2094  df-mo 2569  df-eu 2599  df-clab 2744  df-cleq 2757  df-clel 2840  df-nfc 2914  df-ne 2961  df-nel 3065  df-ral 3080  df-rex 3090  df-rmo 3370  df-reu 3371  df-rab 3418  df-v 3459  df-sbc 3748  df-csb 3856  df-dif 3910  df-un 3912  df-in 3914  df-ss 3924  df-pss 3927  df-nul 4289  df-if 4484  df-pw 4560  df-sn 4586  df-pr 4588  df-op 4592  df-uni 4868  df-int 4908  df-iun 4953  df-br 5105  df-opab 5167  df-mpt 5186  df-tr 5212  df-id 5546  df-eprel 5551  df-po 5559  df-so 5560  df-fr 5604  df-se 5605  df-we 5606  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-res 5663  df-ima 5664  df-pred 6291  df-ord 6352  df-on 6353  df-lim 6354  df-suc 6355  df-iota 6481  df-fun 6527  df-fn 6528  df-f 6529  df-f1 6530  df-fo 6531  df-f1o 6532  df-fv 6533  df-isom 6534  df-riota 7357  df-ov 7403  df-oprab 7404  df-mpo 7405  df-om 7851  df-1st 7974  df-2nd 7975  df-frecs 8266  df-wrecs 8297  df-recs 8346  df-rdg 8385  df-1o 8441  df-er 8682  df-en 8932  df-dom 8933  df-sdom 8934  df-fin 8935  df-sup 9390  df-oi 9460  df-card 9913  df-pnf 11233  df-mnf 11234  df-xr 11235  df-ltxr 11236  df-le 11237  df-sub 11431  df-neg 11432  df-div 11860  df-nn 12222  df-2 12291  df-3 12292  df-n0 12493  df-z 12580  df-uz 12851  df-rp 13005  df-fz 13524  df-fzo 13671  df-seq 14026  df-exp 14086  df-hash 14355  df-cj 15138  df-re 15139  df-im 15140  df-sqrt 15274  df-abs 15275  df-clim 15527  df-sum 15726

This theorem is referenced by:  sge0f1o  46955