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Theorem sumss 15670

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 2733	. . . . 5 ⊢ (ℤ_≥‘𝑀) = (ℤ_≥‘𝑀)
2		simpr 486	. . . . 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 3993	. . . . . 6 ⊢ (𝜑 → 𝐴 ⊆ (ℤ_≥‘𝑀))
6	5	adantr 482	. . . . 5 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → 𝐴 ⊆ (ℤ_≥‘𝑀))
7		nfcv 2904	. . . . . . 7 ⊢ Ⅎ𝑘𝑚
8		nffvmpt1 6903	. . . . . . . 8 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚)
9		nfv 1918	. . . . . . . . 9 ⊢ Ⅎ𝑘 𝑚 ∈ 𝐴
10		nffvmpt1 6903	. . . . . . . . 9 ⊢ Ⅎ𝑘((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚)
11		nfcv 2904	. . . . . . . . 9 ⊢ Ⅎ𝑘0
12	9, 10, 11	nfif 4559	. . . . . . . 8 ⊢ Ⅎ𝑘if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0)
13	8, 12	nfeq 2917	. . . . . . 7 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0)
14		fveq2 6892	. . . . . . . 8 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚))
15		eleq1w 2817	. . . . . . . . 9 ⊢ (𝑘 = 𝑚 → (𝑘 ∈ 𝐴 ↔ 𝑚 ∈ 𝐴))
16		fveq2 6892	. . . . . . . . 9 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘) = ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚))
17	15, 16	ifbieq1d 4553	. . . . . . . 8 ⊢ (𝑘 = 𝑚 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0))
18	14, 17	eqeq12d 2749	. . . . . . 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 2733	. . . . . . . . . . 11 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)) = (𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))
20	19	fvmpt2i 7009	. . . . . . . . . 10 ⊢ (𝑘 ∈ (ℤ_≥‘𝑀) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)))
21		iftrue 4535	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, 𝐶, 0) = 𝐶)
22	21	fveq2d 6896	. . . . . . . . . 10 ⊢ (𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = ( I ‘𝐶))
23	20, 22	sylan9eq 2793	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ_≥‘𝑀) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘𝐶))
24		iftrue 4535	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘))
25		eqid 2733	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ 𝐴 ↦ 𝐶) = (𝑘 ∈ 𝐴 ↦ 𝐶)
26	25	fvmpt2i 7009	. . . . . . . . . . 11 ⊢ (𝑘 ∈ 𝐴 → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘) = ( I ‘𝐶))
27	24, 26	eqtrd 2773	. . . . . . . . . 10 ⊢ (𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
28	27	adantl 483	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ_≥‘𝑀) ∧ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
29	23, 28	eqtr4d 2776	. . . . . . . 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 4538	. . . . . . . . . . . 12 ⊢ (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, 𝐶, 0) = 0)
31	30	fveq2d 6896	. . . . . . . . . . 11 ⊢ (¬ 𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = ( I ‘0))
32		0z 12569	. . . . . . . . . . . 12 ⊢ 0 ∈ ℤ
33		fvi 6968	. . . . . . . . . . . 12 ⊢ (0 ∈ ℤ → ( I ‘0) = 0)
34	32, 33	ax-mp 5	. . . . . . . . . . 11 ⊢ ( I ‘0) = 0
35	31, 34	eqtrdi 2789	. . . . . . . . . 10 ⊢ (¬ 𝑘 ∈ 𝐴 → ( I ‘if(𝑘 ∈ 𝐴, 𝐶, 0)) = 0)
36	20, 35	sylan9eq 2793	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ_≥‘𝑀) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = 0)
37		iffalse 4538	. . . . . . . . . 10 ⊢ (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = 0)
38	37	adantl 483	. . . . . . . . 9 ⊢ ((𝑘 ∈ (ℤ_≥‘𝑀) ∧ ¬ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑘), 0) = 0)
39	36, 38	eqtr4d 2776	. . . . . . . 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 812	. . . . . . 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 3565	. . . . . 6 ⊢ (𝑚 ∈ (ℤ_≥‘𝑀) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐴, ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚), 0))
42	41	adantl 483	. . . . 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 7115	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ 𝐴 ↦ 𝐶):𝐴⟶ℂ)
45	44	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ 𝐴 ↦ 𝐶):𝐴⟶ℂ)
46	45	ffvelcdmda 7087	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ 𝐴) → ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) ∈ ℂ)
47	1, 2, 6, 42, 46	zsum 15664	. . . 4 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = ( ⇝ ‘seq𝑀( + , (𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)))))
48	4	adantr 482	. . . . 5 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → 𝐵 ⊆ (ℤ_≥‘𝑀))
49		nfv 1918	. . . . . . . . 9 ⊢ Ⅎ𝑘𝜑
50		nfv 1918	. . . . . . . . . . 11 ⊢ Ⅎ𝑘 𝑚 ∈ 𝐵
51		nffvmpt1 6903	. . . . . . . . . . 11 ⊢ Ⅎ𝑘((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚)
52	50, 51, 11	nfif 4559	. . . . . . . . . 10 ⊢ Ⅎ𝑘if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)
53	8, 52	nfeq 2917	. . . . . . . . 9 ⊢ Ⅎ𝑘((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0)
54	49, 53	nfim 1900	. . . . . . . 8 ⊢ Ⅎ𝑘(𝜑 → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑚) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
55		eleq1w 2817	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑚 → (𝑘 ∈ 𝐵 ↔ 𝑚 ∈ 𝐵))
56		fveq2 6892	. . . . . . . . . . 11 ⊢ (𝑘 = 𝑚 → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘) = ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚))
57	55, 56	ifbieq1d 4553	. . . . . . . . . 10 ⊢ (𝑘 = 𝑚 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = if(𝑚 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚), 0))
58	14, 57	eqeq12d 2749	. . . . . . . . 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 341	. . . . . . . 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 713	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = ( I ‘𝐶))
61	3	adantr 482	. . . . . . . . . . . . 13 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) → 𝐴 ⊆ 𝐵)
62	61	sselda 3983	. . . . . . . . . . . 12 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → 𝑘 ∈ 𝐵)
63		iftrue 4535	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘))
64		eqid 2733	. . . . . . . . . . . . . 14 ⊢ (𝑘 ∈ 𝐵 ↦ 𝐶) = (𝑘 ∈ 𝐵 ↦ 𝐶)
65	64	fvmpt2i 7009	. . . . . . . . . . . . 13 ⊢ (𝑘 ∈ 𝐵 → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘) = ( I ‘𝐶))
66	63, 65	eqtrd 2773	. . . . . . . . . . . 12 ⊢ (𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
67	62, 66	syl 17	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) ∧ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
68	60, 67	eqtr4d 2776	. . . . . . . . . 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 713	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) ∧ ¬ 𝑘 ∈ 𝐴) → ((𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0))‘𝑘) = 0)
70	66	ad2antrl 727	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = ( I ‘𝐶))
71		eldif 3959	. . . . . . . . . . . . . . . . 17 ⊢ (𝑘 ∈ (𝐵 ∖ 𝐴) ↔ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴))
72		sumss.3	. . . . . . . . . . . . . . . . . . 19 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → 𝐶 = 0)
73	72	fveq2d 6896	. . . . . . . . . . . . . . . . . 18 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → ( I ‘𝐶) = ( I ‘0))
74		0cn 11206	. . . . . . . . . . . . . . . . . . 19 ⊢ 0 ∈ ℂ
75		fvi 6968	. . . . . . . . . . . . . . . . . . 19 ⊢ (0 ∈ ℂ → ( I ‘0) = 0)
76	74, 75	ax-mp 5	. . . . . . . . . . . . . . . . . 18 ⊢ ( I ‘0) = 0
77	73, 76	eqtrdi 2789	. . . . . . . . . . . . . . . . 17 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → ( I ‘𝐶) = 0)
78	71, 77	sylan2br 596	. . . . . . . . . . . . . . . 16 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → ( I ‘𝐶) = 0)
79	70, 78	eqtrd 2773	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
80	79	expr 458	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
81		iffalse 4538	. . . . . . . . . . . . . . . 16 ⊢ (¬ 𝑘 ∈ 𝐵 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
82	81	adantl 483	. . . . . . . . . . . . . . 15 ⊢ ((𝜑 ∧ ¬ 𝑘 ∈ 𝐵) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
83	82	a1d 25	. . . . . . . . . . . . . 14 ⊢ ((𝜑 ∧ ¬ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
84	80, 83	pm2.61dan 812	. . . . . . . . . . . . 13 ⊢ (𝜑 → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
85	84	adantr 482	. . . . . . . . . . . 12 ⊢ ((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) → (¬ 𝑘 ∈ 𝐴 → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0))
86	85	imp 408	. . . . . . . . . . 11 ⊢ (((𝜑 ∧ 𝑘 ∈ (ℤ_≥‘𝑀)) ∧ ¬ 𝑘 ∈ 𝐴) → if(𝑘 ∈ 𝐵, ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑘), 0) = 0)
87	69, 86	eqtr4d 2776	. . . . . . . . . 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 812	. . . . . . . . 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 415	. . . . . . . 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 3565	. . . . . . 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 409	. . . . . 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 714	. . . . 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 414	. . . . . . . . . 10 ⊢ (𝜑 → (𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
94	93	adantr 482	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
95	72, 74	eqeltrdi 2842	. . . . . . . . . . 11 ⊢ ((𝜑 ∧ 𝑘 ∈ (𝐵 ∖ 𝐴)) → 𝐶 ∈ ℂ)
96	71, 95	sylan2br 596	. . . . . . . . . 10 ⊢ ((𝜑 ∧ (𝑘 ∈ 𝐵 ∧ ¬ 𝑘 ∈ 𝐴)) → 𝐶 ∈ ℂ)
97	96	expr 458	. . . . . . . . 9 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → (¬ 𝑘 ∈ 𝐴 → 𝐶 ∈ ℂ))
98	94, 97	pm2.61d 179	. . . . . . . 8 ⊢ ((𝜑 ∧ 𝑘 ∈ 𝐵) → 𝐶 ∈ ℂ)
99	98	fmpttd 7115	. . . . . . 7 ⊢ (𝜑 → (𝑘 ∈ 𝐵 ↦ 𝐶):𝐵⟶ℂ)
100	99	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → (𝑘 ∈ 𝐵 ↦ 𝐶):𝐵⟶ℂ)
101	100	ffvelcdmda 7087	. . . . 5 ⊢ (((𝜑 ∧ 𝑀 ∈ ℤ) ∧ 𝑚 ∈ 𝐵) → ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) ∈ ℂ)
102	1, 2, 48, 92, 101	zsum 15664	. . . 4 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) = ( ⇝ ‘seq𝑀( + , (𝑘 ∈ (ℤ_≥‘𝑀) ↦ if(𝑘 ∈ 𝐴, 𝐶, 0)))))
103	47, 102	eqtr4d 2776	. . 3 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚))
104		sumfc 15655	. . 3 ⊢ Σ𝑚 ∈ 𝐴 ((𝑘 ∈ 𝐴 ↦ 𝐶)‘𝑚) = Σ𝑘 ∈ 𝐴 𝐶
105		sumfc 15655	. . 3 ⊢ Σ𝑚 ∈ 𝐵 ((𝑘 ∈ 𝐵 ↦ 𝐶)‘𝑚) = Σ𝑘 ∈ 𝐵 𝐶
106	103, 104, 105	3eqtr3g 2796	. 2 ⊢ ((𝜑 ∧ 𝑀 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)
107	3	adantr 482	. . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 ⊆ 𝐵)
108		uzf 12825	. . . . . . . . . . . 12 ⊢ ℤ_≥:ℤ⟶𝒫 ℤ
109	108	fdmi 6730	. . . . . . . . . . 11 ⊢ dom ℤ_≥ = ℤ
110	109	eleq2i 2826	. . . . . . . . . 10 ⊢ (𝑀 ∈ dom ℤ_≥ ↔ 𝑀 ∈ ℤ)
111		ndmfv 6927	. . . . . . . . . 10 ⊢ (¬ 𝑀 ∈ dom ℤ_≥ → (ℤ_≥‘𝑀) = ∅)
112	110, 111	sylnbir 331	. . . . . . . . 9 ⊢ (¬ 𝑀 ∈ ℤ → (ℤ_≥‘𝑀) = ∅)
113	112	sseq2d 4015	. . . . . . . 8 ⊢ (¬ 𝑀 ∈ ℤ → (𝐵 ⊆ (ℤ_≥‘𝑀) ↔ 𝐵 ⊆ ∅))
114	4, 113	imbitrid 243	. . . . . . 7 ⊢ (¬ 𝑀 ∈ ℤ → (𝜑 → 𝐵 ⊆ ∅))
115	114	impcom 409	. . . . . 6 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐵 ⊆ ∅)
116	107, 115	sstrd 3993	. . . . 5 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 ⊆ ∅)
117		ss0 4399	. . . . 5 ⊢ (𝐴 ⊆ ∅ → 𝐴 = ∅)
118	116, 117	syl 17	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 = ∅)
119		ss0 4399	. . . . 5 ⊢ (𝐵 ⊆ ∅ → 𝐵 = ∅)
120	115, 119	syl 17	. . . 4 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐵 = ∅)
121	118, 120	eqtr4d 2776	. . 3 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → 𝐴 = 𝐵)
122	121	sumeq1d 15647	. 2 ⊢ ((𝜑 ∧ ¬ 𝑀 ∈ ℤ) → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)
123	106, 122	pm2.61dan 812	1 ⊢ (𝜑 → Σ𝑘 ∈ 𝐴 𝐶 = Σ𝑘 ∈ 𝐵 𝐶)

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ∖ cdif 3946 ⊆ wss 3949 ∅c0 4323 ifcif 4529 𝒫 cpw 4603 ↦ cmpt 5232 I cid 5574 dom cdm 5677 ⟶wf 6540 ‘cfv 6544 ℂcc 11108 0cc0 11110 + caddc 11113 ℤcz 12558 ℤ_≥cuz 12822 seqcseq 13966 ⇝ cli 15428 Σcsu 15632

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5286 ax-sep 5300 ax-nul 5307 ax-pow 5364 ax-pr 5428 ax-un 7725 ax-inf2 9636 ax-cnex 11166 ax-resscn 11167 ax-1cn 11168 ax-icn 11169 ax-addcl 11170 ax-addrcl 11171 ax-mulcl 11172 ax-mulrcl 11173 ax-mulcom 11174 ax-addass 11175 ax-mulass 11176 ax-distr 11177 ax-i2m1 11178 ax-1ne0 11179 ax-1rid 11180 ax-rnegex 11181 ax-rrecex 11182 ax-cnre 11183 ax-pre-lttri 11184 ax-pre-lttrn 11185 ax-pre-ltadd 11186 ax-pre-mulgt0 11187

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-rmo 3377 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3779 df-csb 3895 df-dif 3952 df-un 3954 df-in 3956 df-ss 3966 df-pss 3968 df-nul 4324 df-if 4530 df-pw 4605 df-sn 4630 df-pr 4632 df-op 4636 df-uni 4910 df-int 4952 df-iun 5000 df-br 5150 df-opab 5212 df-mpt 5233 df-tr 5267 df-id 5575 df-eprel 5581 df-po 5589 df-so 5590 df-fr 5632 df-se 5633 df-we 5634 df-xp 5683 df-rel 5684 df-cnv 5685 df-co 5686 df-dm 5687 df-rn 5688 df-res 5689 df-ima 5690 df-pred 6301 df-ord 6368 df-on 6369 df-lim 6370 df-suc 6371 df-iota 6496 df-fun 6546 df-fn 6547 df-f 6548 df-f1 6549 df-fo 6550 df-f1o 6551 df-fv 6552 df-isom 6553 df-riota 7365 df-ov 7412 df-oprab 7413 df-mpo 7414 df-om 7856 df-1st 7975 df-2nd 7976 df-frecs 8266 df-wrecs 8297 df-recs 8371 df-rdg 8410 df-1o 8466 df-er 8703 df-en 8940 df-dom 8941 df-sdom 8942 df-fin 8943 df-oi 9505 df-card 9934 df-pnf 11250 df-mnf 11251 df-xr 11252 df-ltxr 11253 df-le 11254 df-sub 11446 df-neg 11447 df-div 11872 df-nn 12213 df-2 12275 df-n0 12473 df-z 12559 df-uz 12823 df-rp 12975 df-fz 13485 df-fzo 13628 df-seq 13967 df-exp 14028 df-hash 14291 df-cj 15046 df-re 15047 df-im 15048 df-sqrt 15182 df-abs 15183 df-clim 15432 df-sum 15633

This theorem is referenced by: fsumss 15671 sumss2 15672 binomlem 15775 eulerpartlemsv2 33357 eulerpartlemsv3 33360 eulerpartlemv 33363 eulerpartlemb 33367

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