Theorem sumss 15771

Description: Change the index set to a subset in an upper integer sum. (Contributed by Mario Carneiro, 21-Apr-2014.)

Hypotheses

Ref	Expression
sumss.1	⊢ (𝜑 → 𝐴 ⊆ 𝐵)
sumss.2	⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐶 ∈ ℂ)
sumss.3	⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → 𝐶 = 0)
sumss.4	⊢ (𝜑 → 𝐵 ⊆ (ℤ≥‘𝑀))

Assertion

Ref	Expression
sumss	⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)

Distinct variable groups:   𝐴,𝑘   𝐵,𝑘   𝜑,𝑘   𝑘,𝑀

Allowed substitution hint:   𝐶(𝑘)

Proof of Theorem sumss

Dummy variable 𝑚 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		eqid 2769	. . . . 5 ⊢ (ℤ≥‘𝑀) = (ℤ≥‘𝑀)
2		simpr 489	. . . . 5 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → 𝑀 ∈ ℤ)
3		sumss.1	. . . . . . 7 ⊢ (𝜑 → 𝐴 ⊆ 𝐵)
4		sumss.4	. . . . . . 7 ⊢ (𝜑 → 𝐵 ⊆ (ℤ≥‘𝑀))
5	3, 4	sstrd 3955	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ (ℤ≥‘𝑀))
6	5	adantr 485	. . . . 5 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → 𝐴 ⊆ (ℤ≥‘𝑀))
7		nfcv 2931	. . . . . . 7 ⊢ Ⅎ𝑘𝑚
8		nffvmpt1 6890	. . . . . . . 8 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚)
9		nfv 1941	. . . . . . . . 9 ⊢ Ⅎ𝑘 𝑚 ∈ 𝐴
10		nffvmpt1 6890	. . . . . . . . 9 ⊢ Ⅎ𝑘((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚)
11		nfcv 2931	. . . . . . . . 9 ⊢ Ⅎ𝑘0
12	9, 10, 11	nfif 4520	. . . . . . . 8 ⊢ Ⅎ𝑘if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0)
13	8, 12	nfeq 2944	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0)
14		fveq2 6879	. . . . . . . 8 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚))
15		eleq1w 2852	. . . . . . . . 9 ⊢ (𝑘 = 𝑚 → (𝑘 ∈ 𝐴 ↔ 𝑚 ∈ 𝐴))
16		fveq2 6879	. . . . . . . . 9 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘) = ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚))
17	15, 16	ifbieq1d 4514	. . . . . . . 8 ⊢ (𝑘 = 𝑚 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0))
18	14, 17	eqeq12d 2785	. . . . . . 7 ⊢ (𝑘 = 𝑚 → (((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) ↔ ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0)))
19		eqid 2769	. . . . . . . . . . 11 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)) = (𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))
20	19	fvmpt2i 6998	. . . . . . . . . 10 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)))
21		iftrue 4495	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, 𝐶, 0) = 𝐶)
22	21	fveq2d 6883	. . . . . . . . . 10 ⊢ (𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = ( I ‘𝐶))
23	20, 22	sylan9eq 2824	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘𝐶))
24		iftrue 4495	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘))
25		eqid 2769	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐶) = (𝑘 ∈ 𝐴 ↦ 𝐶)
26	25	fvmpt2i 6998	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘) = ( I ‘𝐶))
27	24, 26	eqtrd 2804	. . . . . . . . . 10 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
28	27	adantl 486	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
29	23, 28	eqtr4d 2807	. . . . . . . 8 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0))
30		iffalse 4498	. . . . . . . . . . . 12 ⊢ (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, 𝐶, 0) = 0)
31	30	fveq2d 6883	. . . . . . . . . . 11 ⊢ (¬ 𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = ( I ‘0))
32		0z 12598	. . . . . . . . . . . 12 ⊢ 0 ∈ ℤ
33		fvi 6955	. . . . . . . . . . . 12 ⊢ (0 ∈ ℤ → ( I ‘0) = 0)
34	32, 33	ax-mp 5	. . . . . . . . . . 11 ⊢ ( I ‘0) = 0
35	31, 34	eqtrdi 2820	. . . . . . . . . 10 ⊢ (¬ 𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = 0)
36	20, 35	sylan9eq 2824	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = 0)
37		iffalse 4498	. . . . . . . . . 10 ⊢ (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = 0)
38	37	adantl 486	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ ¬ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = 0)
39	36, 38	eqtr4d 2807	. . . . . . . 8 ⊢ ((𝑘 ∈ (ℤ≥‘𝑀) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0))
40	29, 39	pm2.61dan 824	. . . . . . 7 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0))
41	7, 13, 18, 40	vtoclgaf 3549	. . . . . 6 ⊢ (𝑚 ∈ (ℤ≥‘𝑀) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0))
42	41	adantl 486	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ (ℤ≥‘𝑀)) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0))
43		sumss.2	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐴) → 𝐶 ∈ ℂ)
44	43	fmpttd 7108	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐶):𝐴⟶ℂ)
45	44	adantr 485	. . . . . 6 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ 𝐴 ↦ 𝐶):𝐴⟶ℂ)
46	45	ffvelcdmda 7077	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ 𝐴) → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) ∈ ℂ)
47	1, 2, 6, 42, 46	zsum 15765	. . . 4 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = ( ⇝ ‘seq𝑀( + , (𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)))))
48	4	adantr 485	. . . . 5 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → 𝐵 ⊆ (ℤ≥‘𝑀))
49		nfv 1941	. . . . . . . . 9 ⊢ Ⅎ𝑘𝜑
50		nfv 1941	. . . . . . . . . . 11 ⊢ Ⅎ𝑘 𝑚 ∈ 𝐵
51		nffvmpt1 6890	. . . . . . . . . . 11 ⊢ Ⅎ𝑘((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚)
52	50, 51, 11	nfif 4520	. . . . . . . . . 10 ⊢ Ⅎ𝑘if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)
53	8, 52	nfeq 2944	. . . . . . . . 9 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)
54	49, 53	nfim 1923	. . . . . . . 8 ⊢ Ⅎ𝑘(𝜑 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
55		eleq1w 2852	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑚 → (𝑘 ∈ 𝐵 ↔ 𝑚 ∈ 𝐵))
56		fveq2 6879	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘) = ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚))
57	55, 56	ifbieq1d 4514	. . . . . . . . . 10 ⊢ (𝑘 = 𝑚 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
58	14, 57	eqeq12d 2785	. . . . . . . . 9 ⊢ (𝑘 = 𝑚 → (((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) ↔ ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)))
59	58	imbi2d 343	. . . . . . . 8 ⊢ (𝑘 = 𝑚 → ((𝜑 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0)) ↔ (𝜑 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))))
60	23	adantll 726	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘𝐶))
61	3	adantr 485	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → 𝐴 ⊆ 𝐵)
62	61	sselda 3945	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → 𝑘 ∈ 𝐵)
63		iftrue 4495	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘))
64		eqid 2769	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ 𝐵 ↦ 𝐶) = (𝑘 ∈ 𝐵 ↦ 𝐶)
65	64	fvmpt2i 6998	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ 𝐵 → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘) = ( I ‘𝐶))
66	63, 65	eqtrd 2804	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
67	62, 66	syl 18	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
68	60, 67	eqtr4d 2807	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0))
69	36	adantll 726	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = 0)
70	66	ad2antrl 740	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
71		eldif 3923	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ (𝐵 ∖ 𝐴) ↔ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴))
72		sumss.3	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → 𝐶 = 0)
73	72	fveq2d 6883	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → ( I ‘𝐶) = ( I ‘0))
74		0cn 11194	. . . . . . . . . . . . . . . . . . 19 ⊢ 0 ∈ ℂ
75		fvi 6955	. . . . . . . . . . . . . . . . . . 19 ⊢ (0 ∈ ℂ → ( I ‘0) = 0)
76	74, 75	ax-mp 5	. . . . . . . . . . . . . . . . . 18 ⊢ ( I ‘0) = 0
77	73, 76	eqtrdi 2820	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → ( I ‘𝐶) = 0)
78	71, 77	sylan2br 606	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → ( I ‘𝐶) = 0)
79	70, 78	eqtrd 2804	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
80	79	expr 461	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
81		iffalse 4498	. . . . . . . . . . . . . . . 16 ⊢ (¬ 𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
82	81	adantl 486	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ ¬ 𝑘 ∈ 𝐵) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
83	82	a1d 26	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ ¬ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
84	80, 83	pm2.61dan 824	. . . . . . . . . . . . 13 ⊢ (𝜑 → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
85	84	adantr 485	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
86	85	imp 411	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ ¬ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
87	69, 86	eqtr4d 2807	. . . . . . . . . 10 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0))
88	68, 87	pm2.61dan 824	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ≥‘𝑀)) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0))
89	88	expcom 418	. . . . . . . 8 ⊢ (𝑘 ∈ (ℤ≥‘𝑀) → (𝜑 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0)))
90	7, 54, 59, 89	vtoclgaf 3549	. . . . . . 7 ⊢ (𝑚 ∈ (ℤ≥‘𝑀) → (𝜑 → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)))
91	90	impcom 412	. . . . . 6 ⊢ ((𝜑 ∧ 𝑚 ∈ (ℤ≥‘𝑀)) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
92	91	adantlr 727	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ (ℤ≥‘𝑀)) → ((𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
93	43	ex 417	. . . . . . . . . 10 ⊢ (𝜑 → (𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
94	93	adantr 485	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
95	72, 74	eqeltrdi 2877	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → 𝐶 ∈ ℂ)
96	71, 95	sylan2br 606	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → 𝐶 ∈ ℂ)
97	96	expr 461	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
98	94, 97	pm2.61d 181	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → 𝐶 ∈ ℂ)
99	98	fmpttd 7108	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ 𝐵 ↦ 𝐶):𝐵⟶ℂ)
100	99	adantr 485	. . . . . 6 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ 𝐵 ↦ 𝐶):𝐵⟶ℂ)
101	100	ffvelcdmda 7077	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ 𝐵) → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) ∈ ℂ)
102	1, 2, 48, 92, 101	zsum 15765	. . . 4 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) = ( ⇝ ‘seq𝑀( + , (𝑘 ∈ (ℤ≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)))))
103	47, 102	eqtr4d 2807	. . 3 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚))
104		sumfc 15756	. . 3 ⊢ Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = Σ𝑘 ∈ 𝐴 𝐶
105		sumfc 15756	. . 3 ⊢ Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) = Σ𝑘 ∈ 𝐵 𝐶
106	103, 104, 105	3eqtr3g 2827	. 2 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)
107	3	adantr 485	. . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 ⊆ 𝐵)
108		uzf 12861	. . . . . . . . . . . 12 ⊢ ℤ≥:ℤ⟶𝒫 ℤ
109	108	fdmi 6715	. . . . . . . . . . 11 ⊢ dom ℤ≥ = ℤ
110	109	eleq2i 2861	. . . . . . . . . 10 ⊢ (𝑀 ∈ dom ℤ≥ ↔ 𝑀 ∈ ℤ)
111		ndmfv 6911	. . . . . . . . . 10 ⊢ (¬ 𝑀 ∈ dom ℤ≥ → (ℤ≥‘𝑀) = ∅)
112	110, 111	sylnbir 334	. . . . . . . . 9 ⊢ (¬ 𝑀 ∈ ℤ → (ℤ≥‘𝑀) = ∅)
113	112	sseq2d 3977	. . . . . . . 8 ⊢ (¬ 𝑀 ∈ ℤ → (𝐵 ⊆ (ℤ≥‘𝑀) ↔ 𝐵 ⊆ ∅))
114	4, 113	imbitrid 247	. . . . . . 7 ⊢ (¬ 𝑀 ∈ ℤ → (𝜑 → 𝐵 ⊆ ∅))
115	114	impcom 412	. . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐵 ⊆ ∅)
116	107, 115	sstrd 3955	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 ⊆ ∅)
117		ss0 4365	. . . . 5 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅)
118	116, 117	syl 18	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 = ∅)
119		ss0 4365	. . . . 5 ⊢ (𝐵 ⊆ ∅ → 𝐵 = ∅)
120	115, 119	syl 18	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐵 = ∅)
121	118, 120	eqtr4d 2807	. . 3 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 = 𝐵)
122	121	sumeq1d 15747	. 2 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)
123	106, 122	pm2.61dan 824	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 400   = wceq 1567   ∈ wcel 2149   ∖ cdif 3910   ⊆ wss 3913  ∅c0 4294  ifcif 4489  𝒫 cpw 4564   ↦ cmpt 5193   I cid 5553  dom cdm 5659  ⟶wf 6530  ‘cfv 6534  ℂcc 11094  0cc0 11096   + caddc 11099  ℤcz 12587  ℤ_≥cuz 12858  seqcseq 14033   ⇝ cli 15531  Σcsu 15733

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1822  ax-4 1836  ax-5 1937  ax-6 1994  ax-7 2035  ax-8 2151  ax-9 2159  ax-10 2182  ax-11 2198  ax-12 2219  ax-ext 2741  ax-rep 5239  ax-sep 5258  ax-nul 5268  ax-pow 5334  ax-pr 5402  ax-un 7730  ax-inf2 9606  ax-cnex 11152  ax-resscn 11153  ax-1cn 11154  ax-icn 11155  ax-addcl 11156  ax-addrcl 11157  ax-mulcl 11158  ax-mulrcl 11159  ax-mulcom 11160  ax-addass 11161  ax-mulass 11162  ax-distr 11163  ax-i2m1 11164  ax-1ne0 11165  ax-1rid 11166  ax-rnegex 11167  ax-rrecex 11168  ax-cnre 11169  ax-pre-lttri 11170  ax-pre-lttrn 11171  ax-pre-ltadd 11172  ax-pre-mulgt0 11173

This theorem depends on definitions:  df-bi 210  df-an 401  df-or 861  df-3or 1102  df-3an 1103  df-tru 1570  df-fal 1580  df-ex 1807  df-nf 1811  df-sb 2098  df-mo 2573  df-eu 2603  df-clab 2748  df-cleq 2761  df-clel 2844  df-nfc 2918  df-ne 2965  df-nel 3071  df-ral 3086  df-rex 3096  df-rmo 3376  df-reu 3377  df-rab 3424  df-v 3465  df-sbc 3754  df-csb 3862  df-dif 3916  df-un 3918  df-in 3920  df-ss 3930  df-pss 3933  df-nul 4295  df-if 4490  df-pw 4566  df-sn 4592  df-pr 4594  df-op 4598  df-uni 4874  df-int 4914  df-iun 4959  df-br 5111  df-opab 5175  df-mpt 5194  df-tr 5220  df-id 5554  df-eprel 5559  df-po 5567  df-so 5568  df-fr 5612  df-se 5613  df-we 5614  df-xp 5665  df-rel 5666  df-cnv 5667  df-co 5668  df-dm 5669  df-rn 5670  df-res 5671  df-ima 5672  df-pred 6300  df-ord 6361  df-on 6362  df-lim 6363  df-suc 6364  df-iota 6490  df-fun 6536  df-fn 6537  df-f 6538  df-f1 6539  df-fo 6540  df-f1o 6541  df-fv 6542  df-isom 6543  df-riota 7365  df-ov 7411  df-oprab 7412  df-mpo 7413  df-om 7859  df-1st 7982  df-2nd 7983  df-frecs 8274  df-wrecs 8305  df-recs 8354  df-rdg 8393  df-1o 8449  df-er 8690  df-en 8940  df-dom 8941  df-sdom 8942  df-fin 8943  df-oi 9468  df-card 9921  df-pnf 11241  df-mnf 11242  df-xr 11243  df-ltxr 11244  df-le 11245  df-sub 11439  df-neg 11440  df-div 11868  df-nn 12230  df-2 12299  df-n0 12501  df-z 12588  df-uz 12859  df-rp 13013  df-fz 13532  df-fzo 13679  df-seq 14034  df-exp 14094  df-hash 14363  df-cj 15146  df-re 15147  df-im 15148  df-sqrt 15282  df-abs 15283  df-clim 15535  df-sum 15734

This theorem is referenced by:  fsumss  15772  sumss2  15773  binomlem  15879  eulerpartlemsv2  34689  eulerpartlemsv3  34692  eulerpartlemv  34695  eulerpartlemb  34699