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Theorem fproddiv 14888
Description: The quotient of two finite products. (Contributed by Scott Fenton, 15-Jan-2018.)
Hypotheses
Ref Expression
fprodmul.1 (𝜑𝐴 ∈ Fin)
fprodmul.2 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
fprodmul.3 ((𝜑𝑘𝐴) → 𝐶 ∈ ℂ)
fproddiv.4 ((𝜑𝑘𝐴) → 𝐶 ≠ 0)
Assertion
Ref Expression
fproddiv (𝜑 → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶))
Distinct variable groups:   𝐴,𝑘   𝜑,𝑘
Allowed substitution hints:   𝐵(𝑘)   𝐶(𝑘)

Proof of Theorem fproddiv
Dummy variables 𝑓 𝑚 𝑛 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 1div1e1 10907 . . . . 5 (1 / 1) = 1
21eqcomi 2767 . . . 4 1 = (1 / 1)
3 prodeq1 14836 . . . . 5 (𝐴 = ∅ → ∏𝑘𝐴 (𝐵 / 𝐶) = ∏𝑘 ∈ ∅ (𝐵 / 𝐶))
4 prod0 14870 . . . . 5 𝑘 ∈ ∅ (𝐵 / 𝐶) = 1
53, 4syl6eq 2808 . . . 4 (𝐴 = ∅ → ∏𝑘𝐴 (𝐵 / 𝐶) = 1)
6 prodeq1 14836 . . . . . 6 (𝐴 = ∅ → ∏𝑘𝐴 𝐵 = ∏𝑘 ∈ ∅ 𝐵)
7 prod0 14870 . . . . . 6 𝑘 ∈ ∅ 𝐵 = 1
86, 7syl6eq 2808 . . . . 5 (𝐴 = ∅ → ∏𝑘𝐴 𝐵 = 1)
9 prodeq1 14836 . . . . . 6 (𝐴 = ∅ → ∏𝑘𝐴 𝐶 = ∏𝑘 ∈ ∅ 𝐶)
10 prod0 14870 . . . . . 6 𝑘 ∈ ∅ 𝐶 = 1
119, 10syl6eq 2808 . . . . 5 (𝐴 = ∅ → ∏𝑘𝐴 𝐶 = 1)
128, 11oveq12d 6829 . . . 4 (𝐴 = ∅ → (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶) = (1 / 1))
132, 5, 123eqtr4a 2818 . . 3 (𝐴 = ∅ → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶))
1413a1i 11 . 2 (𝜑 → (𝐴 = ∅ → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶)))
15 simprl 811 . . . . . . . . 9 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (♯‘𝐴) ∈ ℕ)
16 nnuz 11914 . . . . . . . . 9 ℕ = (ℤ‘1)
1715, 16syl6eleq 2847 . . . . . . . 8 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (♯‘𝐴) ∈ (ℤ‘1))
18 fprodmul.2 . . . . . . . . . . 11 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
19 eqid 2758 . . . . . . . . . . 11 (𝑘𝐴𝐵) = (𝑘𝐴𝐵)
2018, 19fmptd 6546 . . . . . . . . . 10 (𝜑 → (𝑘𝐴𝐵):𝐴⟶ℂ)
21 f1of 6296 . . . . . . . . . . 11 (𝑓:(1...(♯‘𝐴))–1-1-onto𝐴𝑓:(1...(♯‘𝐴))⟶𝐴)
2221adantl 473 . . . . . . . . . 10 (((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴) → 𝑓:(1...(♯‘𝐴))⟶𝐴)
23 fco 6217 . . . . . . . . . 10 (((𝑘𝐴𝐵):𝐴⟶ℂ ∧ 𝑓:(1...(♯‘𝐴))⟶𝐴) → ((𝑘𝐴𝐵) ∘ 𝑓):(1...(♯‘𝐴))⟶ℂ)
2420, 22, 23syl2an 495 . . . . . . . . 9 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ((𝑘𝐴𝐵) ∘ 𝑓):(1...(♯‘𝐴))⟶ℂ)
2524ffvelrnda 6520 . . . . . . . 8 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐵) ∘ 𝑓)‘𝑛) ∈ ℂ)
26 fprodmul.3 . . . . . . . . . . 11 ((𝜑𝑘𝐴) → 𝐶 ∈ ℂ)
27 eqid 2758 . . . . . . . . . . 11 (𝑘𝐴𝐶) = (𝑘𝐴𝐶)
2826, 27fmptd 6546 . . . . . . . . . 10 (𝜑 → (𝑘𝐴𝐶):𝐴⟶ℂ)
29 fco 6217 . . . . . . . . . 10 (((𝑘𝐴𝐶):𝐴⟶ℂ ∧ 𝑓:(1...(♯‘𝐴))⟶𝐴) → ((𝑘𝐴𝐶) ∘ 𝑓):(1...(♯‘𝐴))⟶ℂ)
3028, 22, 29syl2an 495 . . . . . . . . 9 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ((𝑘𝐴𝐶) ∘ 𝑓):(1...(♯‘𝐴))⟶ℂ)
3130ffvelrnda 6520 . . . . . . . 8 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛) ∈ ℂ)
32 simprr 813 . . . . . . . . . . 11 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)
3332, 21syl 17 . . . . . . . . . 10 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → 𝑓:(1...(♯‘𝐴))⟶𝐴)
34 fvco3 6435 . . . . . . . . . 10 ((𝑓:(1...(♯‘𝐴))⟶𝐴𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛) = ((𝑘𝐴𝐶)‘(𝑓𝑛)))
3533, 34sylan 489 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛) = ((𝑘𝐴𝐶)‘(𝑓𝑛)))
3633ffvelrnda 6520 . . . . . . . . . 10 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (𝑓𝑛) ∈ 𝐴)
37 simpr 479 . . . . . . . . . . . . . 14 ((𝜑𝑘𝐴) → 𝑘𝐴)
3827fvmpt2 6451 . . . . . . . . . . . . . 14 ((𝑘𝐴𝐶 ∈ ℂ) → ((𝑘𝐴𝐶)‘𝑘) = 𝐶)
3937, 26, 38syl2anc 696 . . . . . . . . . . . . 13 ((𝜑𝑘𝐴) → ((𝑘𝐴𝐶)‘𝑘) = 𝐶)
40 fproddiv.4 . . . . . . . . . . . . 13 ((𝜑𝑘𝐴) → 𝐶 ≠ 0)
4139, 40eqnetrd 2997 . . . . . . . . . . . 12 ((𝜑𝑘𝐴) → ((𝑘𝐴𝐶)‘𝑘) ≠ 0)
4241ralrimiva 3102 . . . . . . . . . . 11 (𝜑 → ∀𝑘𝐴 ((𝑘𝐴𝐶)‘𝑘) ≠ 0)
4342ad2antrr 764 . . . . . . . . . 10 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ∀𝑘𝐴 ((𝑘𝐴𝐶)‘𝑘) ≠ 0)
44 nffvmpt1 6358 . . . . . . . . . . . 12 𝑘((𝑘𝐴𝐶)‘(𝑓𝑛))
45 nfcv 2900 . . . . . . . . . . . 12 𝑘0
4644, 45nfne 3030 . . . . . . . . . . 11 𝑘((𝑘𝐴𝐶)‘(𝑓𝑛)) ≠ 0
47 fveq2 6350 . . . . . . . . . . . 12 (𝑘 = (𝑓𝑛) → ((𝑘𝐴𝐶)‘𝑘) = ((𝑘𝐴𝐶)‘(𝑓𝑛)))
4847neeq1d 2989 . . . . . . . . . . 11 (𝑘 = (𝑓𝑛) → (((𝑘𝐴𝐶)‘𝑘) ≠ 0 ↔ ((𝑘𝐴𝐶)‘(𝑓𝑛)) ≠ 0))
4946, 48rspc 3441 . . . . . . . . . 10 ((𝑓𝑛) ∈ 𝐴 → (∀𝑘𝐴 ((𝑘𝐴𝐶)‘𝑘) ≠ 0 → ((𝑘𝐴𝐶)‘(𝑓𝑛)) ≠ 0))
5036, 43, 49sylc 65 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ((𝑘𝐴𝐶)‘(𝑓𝑛)) ≠ 0)
5135, 50eqnetrd 2997 . . . . . . . 8 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛) ≠ 0)
5218, 26, 40divcld 10991 . . . . . . . . . . . . . 14 ((𝜑𝑘𝐴) → (𝐵 / 𝐶) ∈ ℂ)
53 eqid 2758 . . . . . . . . . . . . . . 15 (𝑘𝐴 ↦ (𝐵 / 𝐶)) = (𝑘𝐴 ↦ (𝐵 / 𝐶))
5453fvmpt2 6451 . . . . . . . . . . . . . 14 ((𝑘𝐴 ∧ (𝐵 / 𝐶) ∈ ℂ) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (𝐵 / 𝐶))
5537, 52, 54syl2anc 696 . . . . . . . . . . . . 13 ((𝜑𝑘𝐴) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (𝐵 / 𝐶))
5619fvmpt2 6451 . . . . . . . . . . . . . . 15 ((𝑘𝐴𝐵 ∈ ℂ) → ((𝑘𝐴𝐵)‘𝑘) = 𝐵)
5737, 18, 56syl2anc 696 . . . . . . . . . . . . . 14 ((𝜑𝑘𝐴) → ((𝑘𝐴𝐵)‘𝑘) = 𝐵)
5857, 39oveq12d 6829 . . . . . . . . . . . . 13 ((𝜑𝑘𝐴) → (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)) = (𝐵 / 𝐶))
5955, 58eqtr4d 2795 . . . . . . . . . . . 12 ((𝜑𝑘𝐴) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)))
6059ralrimiva 3102 . . . . . . . . . . 11 (𝜑 → ∀𝑘𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)))
6160ad2antrr 764 . . . . . . . . . 10 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ∀𝑘𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)))
62 nffvmpt1 6358 . . . . . . . . . . . 12 𝑘((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛))
63 nffvmpt1 6358 . . . . . . . . . . . . 13 𝑘((𝑘𝐴𝐵)‘(𝑓𝑛))
64 nfcv 2900 . . . . . . . . . . . . 13 𝑘 /
6563, 64, 44nfov 6837 . . . . . . . . . . . 12 𝑘(((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛)))
6662, 65nfeq 2912 . . . . . . . . . . 11 𝑘((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛)))
67 fveq2 6350 . . . . . . . . . . . 12 (𝑘 = (𝑓𝑛) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)))
68 fveq2 6350 . . . . . . . . . . . . 13 (𝑘 = (𝑓𝑛) → ((𝑘𝐴𝐵)‘𝑘) = ((𝑘𝐴𝐵)‘(𝑓𝑛)))
6968, 47oveq12d 6829 . . . . . . . . . . . 12 (𝑘 = (𝑓𝑛) → (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛))))
7067, 69eqeq12d 2773 . . . . . . . . . . 11 (𝑘 = (𝑓𝑛) → (((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)) ↔ ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛)))))
7166, 70rspc 3441 . . . . . . . . . 10 ((𝑓𝑛) ∈ 𝐴 → (∀𝑘𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑘) = (((𝑘𝐴𝐵)‘𝑘) / ((𝑘𝐴𝐶)‘𝑘)) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛)))))
7236, 61, 71sylc 65 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛))))
73 fvco3 6435 . . . . . . . . . 10 ((𝑓:(1...(♯‘𝐴))⟶𝐴𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴 ↦ (𝐵 / 𝐶)) ∘ 𝑓)‘𝑛) = ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)))
7433, 73sylan 489 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴 ↦ (𝐵 / 𝐶)) ∘ 𝑓)‘𝑛) = ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)))
75 fvco3 6435 . . . . . . . . . . 11 ((𝑓:(1...(♯‘𝐴))⟶𝐴𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐵) ∘ 𝑓)‘𝑛) = ((𝑘𝐴𝐵)‘(𝑓𝑛)))
7633, 75sylan 489 . . . . . . . . . 10 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴𝐵) ∘ 𝑓)‘𝑛) = ((𝑘𝐴𝐵)‘(𝑓𝑛)))
7776, 35oveq12d 6829 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → ((((𝑘𝐴𝐵) ∘ 𝑓)‘𝑛) / (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛)) = (((𝑘𝐴𝐵)‘(𝑓𝑛)) / ((𝑘𝐴𝐶)‘(𝑓𝑛))))
7872, 74, 773eqtr4d 2802 . . . . . . . 8 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑛 ∈ (1...(♯‘𝐴))) → (((𝑘𝐴 ↦ (𝐵 / 𝐶)) ∘ 𝑓)‘𝑛) = ((((𝑘𝐴𝐵) ∘ 𝑓)‘𝑛) / (((𝑘𝐴𝐶) ∘ 𝑓)‘𝑛)))
7917, 25, 31, 51, 78prodfdiv 14825 . . . . . . 7 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (seq1( · , ((𝑘𝐴 ↦ (𝐵 / 𝐶)) ∘ 𝑓))‘(♯‘𝐴)) = ((seq1( · , ((𝑘𝐴𝐵) ∘ 𝑓))‘(♯‘𝐴)) / (seq1( · , ((𝑘𝐴𝐶) ∘ 𝑓))‘(♯‘𝐴))))
80 fveq2 6350 . . . . . . . 8 (𝑚 = (𝑓𝑛) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑚) = ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘(𝑓𝑛)))
8152, 53fmptd 6546 . . . . . . . . . 10 (𝜑 → (𝑘𝐴 ↦ (𝐵 / 𝐶)):𝐴⟶ℂ)
8281adantr 472 . . . . . . . . 9 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (𝑘𝐴 ↦ (𝐵 / 𝐶)):𝐴⟶ℂ)
8382ffvelrnda 6520 . . . . . . . 8 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑚𝐴) → ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑚) ∈ ℂ)
8480, 15, 32, 83, 74fprod 14868 . . . . . . 7 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ∏𝑚𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑚) = (seq1( · , ((𝑘𝐴 ↦ (𝐵 / 𝐶)) ∘ 𝑓))‘(♯‘𝐴)))
85 fveq2 6350 . . . . . . . . 9 (𝑚 = (𝑓𝑛) → ((𝑘𝐴𝐵)‘𝑚) = ((𝑘𝐴𝐵)‘(𝑓𝑛)))
8620adantr 472 . . . . . . . . . 10 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (𝑘𝐴𝐵):𝐴⟶ℂ)
8786ffvelrnda 6520 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑚𝐴) → ((𝑘𝐴𝐵)‘𝑚) ∈ ℂ)
8885, 15, 32, 87, 76fprod 14868 . . . . . . . 8 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ∏𝑚𝐴 ((𝑘𝐴𝐵)‘𝑚) = (seq1( · , ((𝑘𝐴𝐵) ∘ 𝑓))‘(♯‘𝐴)))
89 fveq2 6350 . . . . . . . . 9 (𝑚 = (𝑓𝑛) → ((𝑘𝐴𝐶)‘𝑚) = ((𝑘𝐴𝐶)‘(𝑓𝑛)))
9028adantr 472 . . . . . . . . . 10 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (𝑘𝐴𝐶):𝐴⟶ℂ)
9190ffvelrnda 6520 . . . . . . . . 9 (((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) ∧ 𝑚𝐴) → ((𝑘𝐴𝐶)‘𝑚) ∈ ℂ)
9289, 15, 32, 91, 35fprod 14868 . . . . . . . 8 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ∏𝑚𝐴 ((𝑘𝐴𝐶)‘𝑚) = (seq1( · , ((𝑘𝐴𝐶) ∘ 𝑓))‘(♯‘𝐴)))
9388, 92oveq12d 6829 . . . . . . 7 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → (∏𝑚𝐴 ((𝑘𝐴𝐵)‘𝑚) / ∏𝑚𝐴 ((𝑘𝐴𝐶)‘𝑚)) = ((seq1( · , ((𝑘𝐴𝐵) ∘ 𝑓))‘(♯‘𝐴)) / (seq1( · , ((𝑘𝐴𝐶) ∘ 𝑓))‘(♯‘𝐴))))
9479, 84, 933eqtr4d 2802 . . . . . 6 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ∏𝑚𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑚) = (∏𝑚𝐴 ((𝑘𝐴𝐵)‘𝑚) / ∏𝑚𝐴 ((𝑘𝐴𝐶)‘𝑚)))
95 prodfc 14872 . . . . . 6 𝑚𝐴 ((𝑘𝐴 ↦ (𝐵 / 𝐶))‘𝑚) = ∏𝑘𝐴 (𝐵 / 𝐶)
96 prodfc 14872 . . . . . . 7 𝑚𝐴 ((𝑘𝐴𝐵)‘𝑚) = ∏𝑘𝐴 𝐵
97 prodfc 14872 . . . . . . 7 𝑚𝐴 ((𝑘𝐴𝐶)‘𝑚) = ∏𝑘𝐴 𝐶
9896, 97oveq12i 6823 . . . . . 6 (∏𝑚𝐴 ((𝑘𝐴𝐵)‘𝑚) / ∏𝑚𝐴 ((𝑘𝐴𝐶)‘𝑚)) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶)
9994, 95, 983eqtr3g 2815 . . . . 5 ((𝜑 ∧ ((♯‘𝐴) ∈ ℕ ∧ 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)) → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶))
10099expr 644 . . . 4 ((𝜑 ∧ (♯‘𝐴) ∈ ℕ) → (𝑓:(1...(♯‘𝐴))–1-1-onto𝐴 → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶)))
101100exlimdv 2008 . . 3 ((𝜑 ∧ (♯‘𝐴) ∈ ℕ) → (∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴 → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶)))
102101expimpd 630 . 2 (𝜑 → (((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴) → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶)))
103 fprodmul.1 . . 3 (𝜑𝐴 ∈ Fin)
104 fz1f1o 14638 . . 3 (𝐴 ∈ Fin → (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)))
105103, 104syl 17 . 2 (𝜑 → (𝐴 = ∅ ∨ ((♯‘𝐴) ∈ ℕ ∧ ∃𝑓 𝑓:(1...(♯‘𝐴))–1-1-onto𝐴)))
10614, 102, 105mpjaod 395 1 (𝜑 → ∏𝑘𝐴 (𝐵 / 𝐶) = (∏𝑘𝐴 𝐵 / ∏𝑘𝐴 𝐶))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wo 382  wa 383   = wceq 1630  wex 1851  wcel 2137  wne 2930  wral 3048  c0 4056  cmpt 4879  ccom 5268  wf 6043  1-1-ontowf1o 6046  cfv 6047  (class class class)co 6811  Fincfn 8119  cc 10124  0cc0 10126  1c1 10127   · cmul 10131   / cdiv 10874  cn 11210  cuz 11877  ...cfz 12517  seqcseq 12993  chash 13309  cprod 14832
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1869  ax-4 1884  ax-5 1986  ax-6 2052  ax-7 2088  ax-8 2139  ax-9 2146  ax-10 2166  ax-11 2181  ax-12 2194  ax-13 2389  ax-ext 2738  ax-rep 4921  ax-sep 4931  ax-nul 4939  ax-pow 4990  ax-pr 5053  ax-un 7112  ax-inf2 8709  ax-cnex 10182  ax-resscn 10183  ax-1cn 10184  ax-icn 10185  ax-addcl 10186  ax-addrcl 10187  ax-mulcl 10188  ax-mulrcl 10189  ax-mulcom 10190  ax-addass 10191  ax-mulass 10192  ax-distr 10193  ax-i2m1 10194  ax-1ne0 10195  ax-1rid 10196  ax-rnegex 10197  ax-rrecex 10198  ax-cnre 10199  ax-pre-lttri 10200  ax-pre-lttrn 10201  ax-pre-ltadd 10202  ax-pre-mulgt0 10203  ax-pre-sup 10204
This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3or 1073  df-3an 1074  df-tru 1633  df-fal 1636  df-ex 1852  df-nf 1857  df-sb 2045  df-eu 2609  df-mo 2610  df-clab 2745  df-cleq 2751  df-clel 2754  df-nfc 2889  df-ne 2931  df-nel 3034  df-ral 3053  df-rex 3054  df-reu 3055  df-rmo 3056  df-rab 3057  df-v 3340  df-sbc 3575  df-csb 3673  df-dif 3716  df-un 3718  df-in 3720  df-ss 3727  df-pss 3729  df-nul 4057  df-if 4229  df-pw 4302  df-sn 4320  df-pr 4322  df-tp 4324  df-op 4326  df-uni 4587  df-int 4626  df-iun 4672  df-br 4803  df-opab 4863  df-mpt 4880  df-tr 4903  df-id 5172  df-eprel 5177  df-po 5185  df-so 5186  df-fr 5223  df-se 5224  df-we 5225  df-xp 5270  df-rel 5271  df-cnv 5272  df-co 5273  df-dm 5274  df-rn 5275  df-res 5276  df-ima 5277  df-pred 5839  df-ord 5885  df-on 5886  df-lim 5887  df-suc 5888  df-iota 6010  df-fun 6049  df-fn 6050  df-f 6051  df-f1 6052  df-fo 6053  df-f1o 6054  df-fv 6055  df-isom 6056  df-riota 6772  df-ov 6814  df-oprab 6815  df-mpt2 6816  df-om 7229  df-1st 7331  df-2nd 7332  df-wrecs 7574  df-recs 7635  df-rdg 7673  df-1o 7727  df-oadd 7731  df-er 7909  df-en 8120  df-dom 8121  df-sdom 8122  df-fin 8123  df-sup 8511  df-oi 8578  df-card 8953  df-pnf 10266  df-mnf 10267  df-xr 10268  df-ltxr 10269  df-le 10270  df-sub 10458  df-neg 10459  df-div 10875  df-nn 11211  df-2 11269  df-3 11270  df-n0 11483  df-z 11568  df-uz 11878  df-rp 12024  df-fz 12518  df-fzo 12658  df-seq 12994  df-exp 13053  df-hash 13310  df-cj 14036  df-re 14037  df-im 14038  df-sqrt 14172  df-abs 14173  df-clim 14416  df-prod 14833
This theorem is referenced by:  fproddivf  14915  bcprod  31929
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