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Theorem telgsumfzs 18310
Description: Telescoping group sum ranging over a finite set of sequential integers, using explicit substitution. (Contributed by AV, 23-Nov-2019.)
Hypotheses
Ref Expression
telgsumfzs.b 𝐵 = (Base‘𝐺)
telgsumfzs.g (𝜑𝐺 ∈ Abel)
telgsumfzs.m = (-g𝐺)
telgsumfzs.n (𝜑𝑁 ∈ (ℤ𝑀))
telgsumfzs.f (𝜑 → ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵)
Assertion
Ref Expression
telgsumfzs (𝜑 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶))
Distinct variable groups:   𝐵,𝑖,𝑘   𝐶,𝑖   𝑖,𝐺   𝑖,𝑀,𝑘   ,𝑖   𝜑,𝑖   𝑖,𝑁,𝑘
Allowed substitution hints:   𝜑(𝑘)   𝐶(𝑘)   𝐺(𝑘)   (𝑘)

Proof of Theorem telgsumfzs
Dummy variables 𝑦 𝑥 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 telgsumfzs.f . 2 (𝜑 → ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵)
2 telgsumfzs.n . . 3 (𝜑𝑁 ∈ (ℤ𝑀))
3 oveq1 6614 . . . . . . . . 9 (𝑥 = 𝑀 → (𝑥 + 1) = (𝑀 + 1))
43oveq2d 6623 . . . . . . . 8 (𝑥 = 𝑀 → (𝑀...(𝑥 + 1)) = (𝑀...(𝑀 + 1)))
54raleqdv 3133 . . . . . . 7 (𝑥 = 𝑀 → (∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵 ↔ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵))
65anbi2d 739 . . . . . 6 (𝑥 = 𝑀 → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) ↔ (𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵)))
7 oveq2 6615 . . . . . . . . 9 (𝑥 = 𝑀 → (𝑀...𝑥) = (𝑀...𝑀))
87mpteq1d 4700 . . . . . . . 8 (𝑥 = 𝑀 → (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)) = (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)))
98oveq2d 6623 . . . . . . 7 (𝑥 = 𝑀 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))))
103csbeq1d 3522 . . . . . . . 8 (𝑥 = 𝑀(𝑥 + 1) / 𝑘𝐶 = (𝑀 + 1) / 𝑘𝐶)
1110oveq2d 6623 . . . . . . 7 (𝑥 = 𝑀 → (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))
129, 11eqeq12d 2636 . . . . . 6 (𝑥 = 𝑀 → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) ↔ (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶)))
136, 12imbi12d 334 . . . . 5 (𝑥 = 𝑀 → (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶)) ↔ ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))))
14 oveq1 6614 . . . . . . . . 9 (𝑥 = 𝑦 → (𝑥 + 1) = (𝑦 + 1))
1514oveq2d 6623 . . . . . . . 8 (𝑥 = 𝑦 → (𝑀...(𝑥 + 1)) = (𝑀...(𝑦 + 1)))
1615raleqdv 3133 . . . . . . 7 (𝑥 = 𝑦 → (∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵 ↔ ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵))
1716anbi2d 739 . . . . . 6 (𝑥 = 𝑦 → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) ↔ (𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵)))
18 oveq2 6615 . . . . . . . . 9 (𝑥 = 𝑦 → (𝑀...𝑥) = (𝑀...𝑦))
1918mpteq1d 4700 . . . . . . . 8 (𝑥 = 𝑦 → (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)) = (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)))
2019oveq2d 6623 . . . . . . 7 (𝑥 = 𝑦 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))))
2114csbeq1d 3522 . . . . . . . 8 (𝑥 = 𝑦(𝑥 + 1) / 𝑘𝐶 = (𝑦 + 1) / 𝑘𝐶)
2221oveq2d 6623 . . . . . . 7 (𝑥 = 𝑦 → (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶))
2320, 22eqeq12d 2636 . . . . . 6 (𝑥 = 𝑦 → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) ↔ (𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶)))
2417, 23imbi12d 334 . . . . 5 (𝑥 = 𝑦 → (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶)) ↔ ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶))))
25 oveq1 6614 . . . . . . . . 9 (𝑥 = (𝑦 + 1) → (𝑥 + 1) = ((𝑦 + 1) + 1))
2625oveq2d 6623 . . . . . . . 8 (𝑥 = (𝑦 + 1) → (𝑀...(𝑥 + 1)) = (𝑀...((𝑦 + 1) + 1)))
2726raleqdv 3133 . . . . . . 7 (𝑥 = (𝑦 + 1) → (∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵 ↔ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵))
2827anbi2d 739 . . . . . 6 (𝑥 = (𝑦 + 1) → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) ↔ (𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵)))
29 oveq2 6615 . . . . . . . . 9 (𝑥 = (𝑦 + 1) → (𝑀...𝑥) = (𝑀...(𝑦 + 1)))
3029mpteq1d 4700 . . . . . . . 8 (𝑥 = (𝑦 + 1) → (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)) = (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)))
3130oveq2d 6623 . . . . . . 7 (𝑥 = (𝑦 + 1) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))))
3225csbeq1d 3522 . . . . . . . 8 (𝑥 = (𝑦 + 1) → (𝑥 + 1) / 𝑘𝐶 = ((𝑦 + 1) + 1) / 𝑘𝐶)
3332oveq2d 6623 . . . . . . 7 (𝑥 = (𝑦 + 1) → (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶))
3431, 33eqeq12d 2636 . . . . . 6 (𝑥 = (𝑦 + 1) → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) ↔ (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶)))
3528, 34imbi12d 334 . . . . 5 (𝑥 = (𝑦 + 1) → (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶)) ↔ ((𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶))))
36 oveq1 6614 . . . . . . . . 9 (𝑥 = 𝑁 → (𝑥 + 1) = (𝑁 + 1))
3736oveq2d 6623 . . . . . . . 8 (𝑥 = 𝑁 → (𝑀...(𝑥 + 1)) = (𝑀...(𝑁 + 1)))
3837raleqdv 3133 . . . . . . 7 (𝑥 = 𝑁 → (∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵 ↔ ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵))
3938anbi2d 739 . . . . . 6 (𝑥 = 𝑁 → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) ↔ (𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵)))
40 oveq2 6615 . . . . . . . . 9 (𝑥 = 𝑁 → (𝑀...𝑥) = (𝑀...𝑁))
4140mpteq1d 4700 . . . . . . . 8 (𝑥 = 𝑁 → (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)) = (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)))
4241oveq2d 6623 . . . . . . 7 (𝑥 = 𝑁 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))))
4336csbeq1d 3522 . . . . . . . 8 (𝑥 = 𝑁(𝑥 + 1) / 𝑘𝐶 = (𝑁 + 1) / 𝑘𝐶)
4443oveq2d 6623 . . . . . . 7 (𝑥 = 𝑁 → (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶))
4542, 44eqeq12d 2636 . . . . . 6 (𝑥 = 𝑁 → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶) ↔ (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶)))
4639, 45imbi12d 334 . . . . 5 (𝑥 = 𝑁 → (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑥 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑥) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑥 + 1) / 𝑘𝐶)) ↔ ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶))))
47 eluzel2 11639 . . . . . . . . . . . 12 (𝑁 ∈ (ℤ𝑀) → 𝑀 ∈ ℤ)
482, 47syl 17 . . . . . . . . . . 11 (𝜑𝑀 ∈ ℤ)
4948adantr 481 . . . . . . . . . 10 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝑀 ∈ ℤ)
50 fzsn 12328 . . . . . . . . . 10 (𝑀 ∈ ℤ → (𝑀...𝑀) = {𝑀})
5149, 50syl 17 . . . . . . . . 9 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀...𝑀) = {𝑀})
5251mpteq1d 4700 . . . . . . . 8 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)) = (𝑖 ∈ {𝑀} ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶)))
5352oveq2d 6623 . . . . . . 7 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝐺 Σg (𝑖 ∈ {𝑀} ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))))
54 telgsumfzs.b . . . . . . . 8 𝐵 = (Base‘𝐺)
55 telgsumfzs.g . . . . . . . . . . 11 (𝜑𝐺 ∈ Abel)
56 ablgrp 18122 . . . . . . . . . . 11 (𝐺 ∈ Abel → 𝐺 ∈ Grp)
5755, 56syl 17 . . . . . . . . . 10 (𝜑𝐺 ∈ Grp)
58 grpmnd 17353 . . . . . . . . . 10 (𝐺 ∈ Grp → 𝐺 ∈ Mnd)
5957, 58syl 17 . . . . . . . . 9 (𝜑𝐺 ∈ Mnd)
6059adantr 481 . . . . . . . 8 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝐺 ∈ Mnd)
6157adantr 481 . . . . . . . . 9 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝐺 ∈ Grp)
62 uzid 11649 . . . . . . . . . . . . 13 (𝑀 ∈ ℤ → 𝑀 ∈ (ℤ𝑀))
6349, 62syl 17 . . . . . . . . . . . 12 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝑀 ∈ (ℤ𝑀))
64 peano2uz 11688 . . . . . . . . . . . 12 (𝑀 ∈ (ℤ𝑀) → (𝑀 + 1) ∈ (ℤ𝑀))
6563, 64syl 17 . . . . . . . . . . 11 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀 + 1) ∈ (ℤ𝑀))
66 eluzfz1 12293 . . . . . . . . . . 11 ((𝑀 + 1) ∈ (ℤ𝑀) → 𝑀 ∈ (𝑀...(𝑀 + 1)))
6765, 66syl 17 . . . . . . . . . 10 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝑀 ∈ (𝑀...(𝑀 + 1)))
68 rspcsbela 3980 . . . . . . . . . 10 ((𝑀 ∈ (𝑀...(𝑀 + 1)) ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝑀 / 𝑘𝐶𝐵)
6967, 68sylancom 700 . . . . . . . . 9 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → 𝑀 / 𝑘𝐶𝐵)
70 eluzfz2 12294 . . . . . . . . . . 11 ((𝑀 + 1) ∈ (ℤ𝑀) → (𝑀 + 1) ∈ (𝑀...(𝑀 + 1)))
7165, 70syl 17 . . . . . . . . . 10 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀 + 1) ∈ (𝑀...(𝑀 + 1)))
72 rspcsbela 3980 . . . . . . . . . 10 (((𝑀 + 1) ∈ (𝑀...(𝑀 + 1)) ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀 + 1) / 𝑘𝐶𝐵)
7371, 72sylancom 700 . . . . . . . . 9 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀 + 1) / 𝑘𝐶𝐵)
74 telgsumfzs.m . . . . . . . . . 10 = (-g𝐺)
7554, 74grpsubcl 17419 . . . . . . . . 9 ((𝐺 ∈ Grp ∧ 𝑀 / 𝑘𝐶𝐵(𝑀 + 1) / 𝑘𝐶𝐵) → (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶) ∈ 𝐵)
7661, 69, 73, 75syl3anc 1323 . . . . . . . 8 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶) ∈ 𝐵)
77 csbeq1 3518 . . . . . . . . . 10 (𝑖 = 𝑀𝑖 / 𝑘𝐶 = 𝑀 / 𝑘𝐶)
78 oveq1 6614 . . . . . . . . . . 11 (𝑖 = 𝑀 → (𝑖 + 1) = (𝑀 + 1))
7978csbeq1d 3522 . . . . . . . . . 10 (𝑖 = 𝑀(𝑖 + 1) / 𝑘𝐶 = (𝑀 + 1) / 𝑘𝐶)
8077, 79oveq12d 6625 . . . . . . . . 9 (𝑖 = 𝑀 → (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))
8180adantl 482 . . . . . . . 8 (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) ∧ 𝑖 = 𝑀) → (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))
8254, 60, 49, 76, 81gsumsnd 18276 . . . . . . 7 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ {𝑀} ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))
8353, 82eqtrd 2655 . . . . . 6 ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶))
8483a1i 11 . . . . 5 (𝑀 ∈ ℤ → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑀 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑀) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑀 + 1) / 𝑘𝐶)))
8554, 55, 74telgsumfzslem 18309 . . . . . . 7 ((𝑦 ∈ (ℤ𝑀) ∧ (𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵)) → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶) → (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶)))
8685ex 450 . . . . . 6 (𝑦 ∈ (ℤ𝑀) → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵) → ((𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶) → (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶))))
87 eluzelz 11644 . . . . . . . . . . 11 (𝑦 ∈ (ℤ𝑀) → 𝑦 ∈ ℤ)
8887peano2zd 11432 . . . . . . . . . 10 (𝑦 ∈ (ℤ𝑀) → (𝑦 + 1) ∈ ℤ)
8988peano2zd 11432 . . . . . . . . . 10 (𝑦 ∈ (ℤ𝑀) → ((𝑦 + 1) + 1) ∈ ℤ)
90 peano2z 11365 . . . . . . . . . . . . 13 (𝑦 ∈ ℤ → (𝑦 + 1) ∈ ℤ)
9190zred 11429 . . . . . . . . . . . 12 (𝑦 ∈ ℤ → (𝑦 + 1) ∈ ℝ)
9287, 91syl 17 . . . . . . . . . . 11 (𝑦 ∈ (ℤ𝑀) → (𝑦 + 1) ∈ ℝ)
9392lep1d 10902 . . . . . . . . . 10 (𝑦 ∈ (ℤ𝑀) → (𝑦 + 1) ≤ ((𝑦 + 1) + 1))
94 eluz2 11640 . . . . . . . . . 10 (((𝑦 + 1) + 1) ∈ (ℤ‘(𝑦 + 1)) ↔ ((𝑦 + 1) ∈ ℤ ∧ ((𝑦 + 1) + 1) ∈ ℤ ∧ (𝑦 + 1) ≤ ((𝑦 + 1) + 1)))
9588, 89, 93, 94syl3anbrc 1244 . . . . . . . . 9 (𝑦 ∈ (ℤ𝑀) → ((𝑦 + 1) + 1) ∈ (ℤ‘(𝑦 + 1)))
96 fzss2 12326 . . . . . . . . 9 (((𝑦 + 1) + 1) ∈ (ℤ‘(𝑦 + 1)) → (𝑀...(𝑦 + 1)) ⊆ (𝑀...((𝑦 + 1) + 1)))
9795, 96syl 17 . . . . . . . 8 (𝑦 ∈ (ℤ𝑀) → (𝑀...(𝑦 + 1)) ⊆ (𝑀...((𝑦 + 1) + 1)))
98 ssralv 3647 . . . . . . . 8 ((𝑀...(𝑦 + 1)) ⊆ (𝑀...((𝑦 + 1) + 1)) → (∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵 → ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵))
9997, 98syl 17 . . . . . . 7 (𝑦 ∈ (ℤ𝑀) → (∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵 → ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵))
10099adantld 483 . . . . . 6 (𝑦 ∈ (ℤ𝑀) → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵) → ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵))
10186, 100a2and 852 . . . . 5 (𝑦 ∈ (ℤ𝑀) → (((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑦 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑦) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑦 + 1) / 𝑘𝐶)) → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...((𝑦 + 1) + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...(𝑦 + 1)) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 ((𝑦 + 1) + 1) / 𝑘𝐶))))
10213, 24, 35, 46, 84, 101uzind4 11693 . . . 4 (𝑁 ∈ (ℤ𝑀) → ((𝜑 ∧ ∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵) → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶)))
103102expd 452 . . 3 (𝑁 ∈ (ℤ𝑀) → (𝜑 → (∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶))))
1042, 103mpcom 38 . 2 (𝜑 → (∀𝑘 ∈ (𝑀...(𝑁 + 1))𝐶𝐵 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶)))
1051, 104mpd 15 1 (𝜑 → (𝐺 Σg (𝑖 ∈ (𝑀...𝑁) ↦ (𝑖 / 𝑘𝐶 (𝑖 + 1) / 𝑘𝐶))) = (𝑀 / 𝑘𝐶 (𝑁 + 1) / 𝑘𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wa 384   = wceq 1480  wcel 1987  wral 2907  csb 3515  wss 3556  {csn 4150   class class class wbr 4615  cmpt 4675  cfv 5849  (class class class)co 6607  cr 9882  1c1 9884   + caddc 9886  cle 10022  cz 11324  cuz 11634  ...cfz 12271  Basecbs 15784   Σg cgsu 16025  Mndcmnd 17218  Grpcgrp 17346  -gcsg 17348  Abelcabl 18118
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1719  ax-4 1734  ax-5 1836  ax-6 1885  ax-7 1932  ax-8 1989  ax-9 1996  ax-10 2016  ax-11 2031  ax-12 2044  ax-13 2245  ax-ext 2601  ax-rep 4733  ax-sep 4743  ax-nul 4751  ax-pow 4805  ax-pr 4869  ax-un 6905  ax-inf2 8485  ax-cnex 9939  ax-resscn 9940  ax-1cn 9941  ax-icn 9942  ax-addcl 9943  ax-addrcl 9944  ax-mulcl 9945  ax-mulrcl 9946  ax-mulcom 9947  ax-addass 9948  ax-mulass 9949  ax-distr 9950  ax-i2m1 9951  ax-1ne0 9952  ax-1rid 9953  ax-rnegex 9954  ax-rrecex 9955  ax-cnre 9956  ax-pre-lttri 9957  ax-pre-lttrn 9958  ax-pre-ltadd 9959  ax-pre-mulgt0 9960
This theorem depends on definitions:  df-bi 197  df-or 385  df-an 386  df-3or 1037  df-3an 1038  df-tru 1483  df-fal 1486  df-ex 1702  df-nf 1707  df-sb 1878  df-eu 2473  df-mo 2474  df-clab 2608  df-cleq 2614  df-clel 2617  df-nfc 2750  df-ne 2791  df-nel 2894  df-ral 2912  df-rex 2913  df-reu 2914  df-rmo 2915  df-rab 2916  df-v 3188  df-sbc 3419  df-csb 3516  df-dif 3559  df-un 3561  df-in 3563  df-ss 3570  df-pss 3572  df-nul 3894  df-if 4061  df-pw 4134  df-sn 4151  df-pr 4153  df-tp 4155  df-op 4157  df-uni 4405  df-int 4443  df-iun 4489  df-iin 4490  df-br 4616  df-opab 4676  df-mpt 4677  df-tr 4715  df-eprel 4987  df-id 4991  df-po 4997  df-so 4998  df-fr 5035  df-se 5036  df-we 5037  df-xp 5082  df-rel 5083  df-cnv 5084  df-co 5085  df-dm 5086  df-rn 5087  df-res 5088  df-ima 5089  df-pred 5641  df-ord 5687  df-on 5688  df-lim 5689  df-suc 5690  df-iota 5812  df-fun 5851  df-fn 5852  df-f 5853  df-f1 5854  df-fo 5855  df-f1o 5856  df-fv 5857  df-isom 5858  df-riota 6568  df-ov 6610  df-oprab 6611  df-mpt2 6612  df-of 6853  df-om 7016  df-1st 7116  df-2nd 7117  df-supp 7244  df-wrecs 7355  df-recs 7416  df-rdg 7454  df-1o 7508  df-oadd 7512  df-er 7690  df-en 7903  df-dom 7904  df-sdom 7905  df-fin 7906  df-fsupp 8223  df-oi 8362  df-card 8712  df-pnf 10023  df-mnf 10024  df-xr 10025  df-ltxr 10026  df-le 10027  df-sub 10215  df-neg 10216  df-nn 10968  df-2 11026  df-n0 11240  df-z 11325  df-uz 11635  df-fz 12272  df-fzo 12410  df-seq 12745  df-hash 13061  df-ndx 15787  df-slot 15788  df-base 15789  df-sets 15790  df-ress 15791  df-plusg 15878  df-0g 16026  df-gsum 16027  df-mre 16170  df-mrc 16171  df-acs 16173  df-mgm 17166  df-sgrp 17208  df-mnd 17219  df-submnd 17260  df-grp 17349  df-minusg 17350  df-sbg 17351  df-mulg 17465  df-cntz 17674  df-cmn 18119  df-abl 18120
This theorem is referenced by:  telgsumfz  18311  telgsumfz0s  18312
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