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Theorem fprod 14375
Description: The value of a product over a nonempty finite set. (Contributed by Scott Fenton, 6-Dec-2017.)
Hypotheses
Ref Expression
fprod.1 (𝑘 = (𝐹𝑛) → 𝐵 = 𝐶)
fprod.2 (𝜑𝑀 ∈ ℕ)
fprod.3 (𝜑𝐹:(1...𝑀)–1-1-onto𝐴)
fprod.4 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
fprod.5 ((𝜑𝑛 ∈ (1...𝑀)) → (𝐺𝑛) = 𝐶)
Assertion
Ref Expression
fprod (𝜑 → ∏𝑘𝐴 𝐵 = (seq1( · , 𝐺)‘𝑀))
Distinct variable groups:   𝐴,𝑘,𝑛   𝐵,𝑛   𝐶,𝑘   𝑘,𝐹,𝑛   𝑘,𝐺,𝑛   𝜑,𝑘   𝑘,𝑀,𝑛   𝜑,𝑛
Allowed substitution hints:   𝐵(𝑘)   𝐶(𝑛)

Proof of Theorem fprod
Dummy variables 𝑓 𝑖 𝑗 𝑚 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 df-prod 14340 . 2 𝑘𝐴 𝐵 = (℩𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
2 fvex 5996 . . 3 (seq1( · , 𝐺)‘𝑀) ∈ V
3 nfcv 2655 . . . . . . . . 9 𝑗if(𝑘𝐴, 𝐵, 1)
4 nfv 1796 . . . . . . . . . 10 𝑘 𝑗𝐴
5 nfcsb1v 3419 . . . . . . . . . 10 𝑘𝑗 / 𝑘𝐵
6 nfcv 2655 . . . . . . . . . 10 𝑘1
74, 5, 6nfif 3968 . . . . . . . . 9 𝑘if(𝑗𝐴, 𝑗 / 𝑘𝐵, 1)
8 eleq1 2580 . . . . . . . . . 10 (𝑘 = 𝑗 → (𝑘𝐴𝑗𝐴))
9 csbeq1a 3412 . . . . . . . . . 10 (𝑘 = 𝑗𝐵 = 𝑗 / 𝑘𝐵)
108, 9ifbieq1d 3962 . . . . . . . . 9 (𝑘 = 𝑗 → if(𝑘𝐴, 𝐵, 1) = if(𝑗𝐴, 𝑗 / 𝑘𝐵, 1))
113, 7, 10cbvmpt 4575 . . . . . . . 8 (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1)) = (𝑗 ∈ ℤ ↦ if(𝑗𝐴, 𝑗 / 𝑘𝐵, 1))
12 fprod.4 . . . . . . . . . 10 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
1312ralrimiva 2853 . . . . . . . . 9 (𝜑 → ∀𝑘𝐴 𝐵 ∈ ℂ)
145nfel1 2669 . . . . . . . . . 10 𝑘𝑗 / 𝑘𝐵 ∈ ℂ
159eleq1d 2576 . . . . . . . . . 10 (𝑘 = 𝑗 → (𝐵 ∈ ℂ ↔ 𝑗 / 𝑘𝐵 ∈ ℂ))
1614, 15rspc 3180 . . . . . . . . 9 (𝑗𝐴 → (∀𝑘𝐴 𝐵 ∈ ℂ → 𝑗 / 𝑘𝐵 ∈ ℂ))
1713, 16mpan9 484 . . . . . . . 8 ((𝜑𝑗𝐴) → 𝑗 / 𝑘𝐵 ∈ ℂ)
18 fveq2 5986 . . . . . . . . . . 11 (𝑛 = 𝑖 → (𝑓𝑛) = (𝑓𝑖))
1918csbeq1d 3410 . . . . . . . . . 10 (𝑛 = 𝑖(𝑓𝑛) / 𝑘𝐵 = (𝑓𝑖) / 𝑘𝐵)
20 csbco 3413 . . . . . . . . . 10 (𝑓𝑖) / 𝑗𝑗 / 𝑘𝐵 = (𝑓𝑖) / 𝑘𝐵
2119, 20syl6eqr 2566 . . . . . . . . 9 (𝑛 = 𝑖(𝑓𝑛) / 𝑘𝐵 = (𝑓𝑖) / 𝑗𝑗 / 𝑘𝐵)
2221cbvmptv 4576 . . . . . . . 8 (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵) = (𝑖 ∈ ℕ ↦ (𝑓𝑖) / 𝑗𝑗 / 𝑘𝐵)
2311, 17, 22prodmo 14370 . . . . . . 7 (𝜑 → ∃*𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
24 fprod.2 . . . . . . . . 9 (𝜑𝑀 ∈ ℕ)
25 fprod.3 . . . . . . . . . . . 12 (𝜑𝐹:(1...𝑀)–1-1-onto𝐴)
26 f1of 5933 . . . . . . . . . . . 12 (𝐹:(1...𝑀)–1-1-onto𝐴𝐹:(1...𝑀)⟶𝐴)
2725, 26syl 17 . . . . . . . . . . 11 (𝜑𝐹:(1...𝑀)⟶𝐴)
28 ovex 6453 . . . . . . . . . . 11 (1...𝑀) ∈ V
29 fex 6270 . . . . . . . . . . 11 ((𝐹:(1...𝑀)⟶𝐴 ∧ (1...𝑀) ∈ V) → 𝐹 ∈ V)
3027, 28, 29sylancl 692 . . . . . . . . . 10 (𝜑𝐹 ∈ V)
31 nnuz 11459 . . . . . . . . . . . . 13 ℕ = (ℤ‘1)
3224, 31syl6eleq 2602 . . . . . . . . . . . 12 (𝜑𝑀 ∈ (ℤ‘1))
33 fprod.5 . . . . . . . . . . . . . . 15 ((𝜑𝑛 ∈ (1...𝑀)) → (𝐺𝑛) = 𝐶)
34 elfznn 12106 . . . . . . . . . . . . . . . . 17 (𝑛 ∈ (1...𝑀) → 𝑛 ∈ ℕ)
3534adantl 480 . . . . . . . . . . . . . . . 16 ((𝜑𝑛 ∈ (1...𝑀)) → 𝑛 ∈ ℕ)
36 fvex 5996 . . . . . . . . . . . . . . . . 17 (𝐺𝑛) ∈ V
3733, 36syl6eqelr 2601 . . . . . . . . . . . . . . . 16 ((𝜑𝑛 ∈ (1...𝑀)) → 𝐶 ∈ V)
38 eqid 2514 . . . . . . . . . . . . . . . . 17 (𝑛 ∈ ℕ ↦ 𝐶) = (𝑛 ∈ ℕ ↦ 𝐶)
3938fvmpt2 6083 . . . . . . . . . . . . . . . 16 ((𝑛 ∈ ℕ ∧ 𝐶 ∈ V) → ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛) = 𝐶)
4035, 37, 39syl2anc 690 . . . . . . . . . . . . . . 15 ((𝜑𝑛 ∈ (1...𝑀)) → ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛) = 𝐶)
4133, 40eqtr4d 2551 . . . . . . . . . . . . . 14 ((𝜑𝑛 ∈ (1...𝑀)) → (𝐺𝑛) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛))
4241ralrimiva 2853 . . . . . . . . . . . . 13 (𝜑 → ∀𝑛 ∈ (1...𝑀)(𝐺𝑛) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛))
43 nffvmpt1 5994 . . . . . . . . . . . . . . 15 𝑛((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘)
4443nfeq2 2670 . . . . . . . . . . . . . 14 𝑛(𝐺𝑘) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘)
45 fveq2 5986 . . . . . . . . . . . . . . 15 (𝑛 = 𝑘 → (𝐺𝑛) = (𝐺𝑘))
46 fveq2 5986 . . . . . . . . . . . . . . 15 (𝑛 = 𝑘 → ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘))
4745, 46eqeq12d 2529 . . . . . . . . . . . . . 14 (𝑛 = 𝑘 → ((𝐺𝑛) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛) ↔ (𝐺𝑘) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘)))
4844, 47rspc 3180 . . . . . . . . . . . . 13 (𝑘 ∈ (1...𝑀) → (∀𝑛 ∈ (1...𝑀)(𝐺𝑛) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑛) → (𝐺𝑘) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘)))
4942, 48mpan9 484 . . . . . . . . . . . 12 ((𝜑𝑘 ∈ (1...𝑀)) → (𝐺𝑘) = ((𝑛 ∈ ℕ ↦ 𝐶)‘𝑘))
5032, 49seqfveq 12552 . . . . . . . . . . 11 (𝜑 → (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀))
5125, 50jca 552 . . . . . . . . . 10 (𝜑 → (𝐹:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀)))
52 f1oeq1 5923 . . . . . . . . . . . 12 (𝑓 = 𝐹 → (𝑓:(1...𝑀)–1-1-onto𝐴𝐹:(1...𝑀)–1-1-onto𝐴))
53 fveq1 5985 . . . . . . . . . . . . . . . . . 18 (𝑓 = 𝐹 → (𝑓𝑛) = (𝐹𝑛))
5453csbeq1d 3410 . . . . . . . . . . . . . . . . 17 (𝑓 = 𝐹(𝑓𝑛) / 𝑘𝐵 = (𝐹𝑛) / 𝑘𝐵)
55 fvex 5996 . . . . . . . . . . . . . . . . . 18 (𝐹𝑛) ∈ V
56 fprod.1 . . . . . . . . . . . . . . . . . 18 (𝑘 = (𝐹𝑛) → 𝐵 = 𝐶)
5755, 56csbie 3429 . . . . . . . . . . . . . . . . 17 (𝐹𝑛) / 𝑘𝐵 = 𝐶
5854, 57syl6eq 2564 . . . . . . . . . . . . . . . 16 (𝑓 = 𝐹(𝑓𝑛) / 𝑘𝐵 = 𝐶)
5958mpteq2dv 4571 . . . . . . . . . . . . . . 15 (𝑓 = 𝐹 → (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵) = (𝑛 ∈ ℕ ↦ 𝐶))
6059seqeq3d 12536 . . . . . . . . . . . . . 14 (𝑓 = 𝐹 → seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵)) = seq1( · , (𝑛 ∈ ℕ ↦ 𝐶)))
6160fveq1d 5988 . . . . . . . . . . . . 13 (𝑓 = 𝐹 → (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀))
6261eqeq2d 2524 . . . . . . . . . . . 12 (𝑓 = 𝐹 → ((seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀) ↔ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀)))
6352, 62anbi12d 742 . . . . . . . . . . 11 (𝑓 = 𝐹 → ((𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀)) ↔ (𝐹:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀))))
6463spcegv 3171 . . . . . . . . . 10 (𝐹 ∈ V → ((𝐹:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ 𝐶))‘𝑀)) → ∃𝑓(𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀))))
6530, 51, 64sylc 62 . . . . . . . . 9 (𝜑 → ∃𝑓(𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀)))
66 oveq2 6433 . . . . . . . . . . . . 13 (𝑚 = 𝑀 → (1...𝑚) = (1...𝑀))
67 f1oeq2 5924 . . . . . . . . . . . . 13 ((1...𝑚) = (1...𝑀) → (𝑓:(1...𝑚)–1-1-onto𝐴𝑓:(1...𝑀)–1-1-onto𝐴))
6866, 67syl 17 . . . . . . . . . . . 12 (𝑚 = 𝑀 → (𝑓:(1...𝑚)–1-1-onto𝐴𝑓:(1...𝑀)–1-1-onto𝐴))
69 fveq2 5986 . . . . . . . . . . . . 13 (𝑚 = 𝑀 → (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀))
7069eqeq2d 2524 . . . . . . . . . . . 12 (𝑚 = 𝑀 → ((seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚) ↔ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀)))
7168, 70anbi12d 742 . . . . . . . . . . 11 (𝑚 = 𝑀 → ((𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)) ↔ (𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀))))
7271exbidv 1803 . . . . . . . . . 10 (𝑚 = 𝑀 → (∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)) ↔ ∃𝑓(𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀))))
7372rspcev 3186 . . . . . . . . 9 ((𝑀 ∈ ℕ ∧ ∃𝑓(𝑓:(1...𝑀)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑀))) → ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))
7424, 65, 73syl2anc 690 . . . . . . . 8 (𝜑 → ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))
7574olcd 406 . . . . . . 7 (𝜑 → (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
76 breq2 4485 . . . . . . . . . . . . . 14 (𝑥 = (seq1( · , 𝐺)‘𝑀) → (seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥 ↔ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)))
77763anbi3d 1396 . . . . . . . . . . . . 13 (𝑥 = (seq1( · , 𝐺)‘𝑀) → ((𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ↔ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀))))
7877rexbidv 2938 . . . . . . . . . . . 12 (𝑥 = (seq1( · , 𝐺)‘𝑀) → (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ↔ ∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀))))
79 eqeq1 2518 . . . . . . . . . . . . . . 15 (𝑥 = (seq1( · , 𝐺)‘𝑀) → (𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚) ↔ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))
8079anbi2d 735 . . . . . . . . . . . . . 14 (𝑥 = (seq1( · , 𝐺)‘𝑀) → ((𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)) ↔ (𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
8180exbidv 1803 . . . . . . . . . . . . 13 (𝑥 = (seq1( · , 𝐺)‘𝑀) → (∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)) ↔ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
8281rexbidv 2938 . . . . . . . . . . . 12 (𝑥 = (seq1( · , 𝐺)‘𝑀) → (∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)) ↔ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))
8378, 82orbi12d 741 . . . . . . . . . . 11 (𝑥 = (seq1( · , 𝐺)‘𝑀) → ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ↔ (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))))
8483moi2 3258 . . . . . . . . . 10 ((((seq1( · , 𝐺)‘𝑀) ∈ V ∧ ∃*𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))) ∧ ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))) → 𝑥 = (seq1( · , 𝐺)‘𝑀))
852, 84mpanl1 711 . . . . . . . . 9 ((∃*𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))) → 𝑥 = (seq1( · , 𝐺)‘𝑀))
8685ancom2s 839 . . . . . . . 8 ((∃*𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))))) → 𝑥 = (seq1( · , 𝐺)‘𝑀))
8786expr 640 . . . . . . 7 ((∃*𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ∧ (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ (seq1( · , 𝐺)‘𝑀)) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴 ∧ (seq1( · , 𝐺)‘𝑀) = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))) → ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) → 𝑥 = (seq1( · , 𝐺)‘𝑀)))
8823, 75, 87syl2anc 690 . . . . . 6 (𝜑 → ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) → 𝑥 = (seq1( · , 𝐺)‘𝑀)))
8975, 83syl5ibrcom 235 . . . . . 6 (𝜑 → (𝑥 = (seq1( · , 𝐺)‘𝑀) → (∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))))
9088, 89impbid 200 . . . . 5 (𝜑 → ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ↔ 𝑥 = (seq1( · , 𝐺)‘𝑀)))
9190adantr 479 . . . 4 ((𝜑 ∧ (seq1( · , 𝐺)‘𝑀) ∈ V) → ((∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚))) ↔ 𝑥 = (seq1( · , 𝐺)‘𝑀)))
9291iota5 5673 . . 3 ((𝜑 ∧ (seq1( · , 𝐺)‘𝑀) ∈ V) → (℩𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))) = (seq1( · , 𝐺)‘𝑀))
932, 92mpan2 702 . 2 (𝜑 → (℩𝑥(∃𝑚 ∈ ℤ (𝐴 ⊆ (ℤ𝑚) ∧ ∃𝑛 ∈ (ℤ𝑚)∃𝑦(𝑦 ≠ 0 ∧ seq𝑛( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑦) ∧ seq𝑚( · , (𝑘 ∈ ℤ ↦ if(𝑘𝐴, 𝐵, 1))) ⇝ 𝑥) ∨ ∃𝑚 ∈ ℕ ∃𝑓(𝑓:(1...𝑚)–1-1-onto𝐴𝑥 = (seq1( · , (𝑛 ∈ ℕ ↦ (𝑓𝑛) / 𝑘𝐵))‘𝑚)))) = (seq1( · , 𝐺)‘𝑀))
941, 93syl5eq 2560 1 (𝜑 → ∏𝑘𝐴 𝐵 = (seq1( · , 𝐺)‘𝑀))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 194  wo 381  wa 382  w3a 1030   = wceq 1474  wex 1694  wcel 1938  ∃*wmo 2363  wne 2684  wral 2800  wrex 2801  Vcvv 3077  csb 3403  wss 3444  ifcif 3939   class class class wbr 4481  cmpt 4541  cio 5651  wf 5685  1-1-ontowf1o 5688  cfv 5689  (class class class)co 6425  cc 9687  0cc0 9689  1c1 9690   · cmul 9694  cn 10773  cz 11116  cuz 11423  ...cfz 12062  seqcseq 12528  cli 13925  cprod 14339
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1700  ax-4 1713  ax-5 1793  ax-6 1838  ax-7 1885  ax-8 1940  ax-9 1947  ax-10 1966  ax-11 1971  ax-12 1983  ax-13 2137  ax-ext 2494  ax-rep 4597  ax-sep 4607  ax-nul 4616  ax-pow 4668  ax-pr 4732  ax-un 6721  ax-inf2 8295  ax-cnex 9745  ax-resscn 9746  ax-1cn 9747  ax-icn 9748  ax-addcl 9749  ax-addrcl 9750  ax-mulcl 9751  ax-mulrcl 9752  ax-mulcom 9753  ax-addass 9754  ax-mulass 9755  ax-distr 9756  ax-i2m1 9757  ax-1ne0 9758  ax-1rid 9759  ax-rnegex 9760  ax-rrecex 9761  ax-cnre 9762  ax-pre-lttri 9763  ax-pre-lttrn 9764  ax-pre-ltadd 9765  ax-pre-mulgt0 9766  ax-pre-sup 9767
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3or 1031  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1699  df-sb 1831  df-eu 2366  df-mo 2367  df-clab 2501  df-cleq 2507  df-clel 2510  df-nfc 2644  df-ne 2686  df-nel 2687  df-ral 2805  df-rex 2806  df-reu 2807  df-rmo 2808  df-rab 2809  df-v 3079  df-sbc 3307  df-csb 3404  df-dif 3447  df-un 3449  df-in 3451  df-ss 3458  df-pss 3460  df-nul 3778  df-if 3940  df-pw 4013  df-sn 4029  df-pr 4031  df-tp 4033  df-op 4035  df-uni 4271  df-int 4309  df-iun 4355  df-br 4482  df-opab 4542  df-mpt 4543  df-tr 4579  df-eprel 4843  df-id 4847  df-po 4853  df-so 4854  df-fr 4891  df-se 4892  df-we 4893  df-xp 4938  df-rel 4939  df-cnv 4940  df-co 4941  df-dm 4942  df-rn 4943  df-res 4944  df-ima 4945  df-pred 5487  df-ord 5533  df-on 5534  df-lim 5535  df-suc 5536  df-iota 5653  df-fun 5691  df-fn 5692  df-f 5693  df-f1 5694  df-fo 5695  df-f1o 5696  df-fv 5697  df-isom 5698  df-riota 6387  df-ov 6428  df-oprab 6429  df-mpt2 6430  df-om 6832  df-1st 6932  df-2nd 6933  df-wrecs 7167  df-recs 7229  df-rdg 7267  df-1o 7321  df-oadd 7325  df-er 7503  df-en 7716  df-dom 7717  df-sdom 7718  df-fin 7719  df-sup 8105  df-oi 8172  df-card 8522  df-pnf 9829  df-mnf 9830  df-xr 9831  df-ltxr 9832  df-le 9833  df-sub 10017  df-neg 10018  df-div 10432  df-nn 10774  df-2 10832  df-3 10833  df-n0 11046  df-z 11117  df-uz 11424  df-rp 11571  df-fz 12063  df-fzo 12200  df-seq 12529  df-exp 12588  df-hash 12845  df-cj 13542  df-re 13543  df-im 13544  df-sqrt 13678  df-abs 13679  df-clim 13929  df-prod 14340
This theorem is referenced by:  prod1  14378  fprodf1o  14380  fprodser  14383  fprodcl2lem  14384  fprodmul  14394  fproddiv  14395  prodsn  14396  prodsnf  14398  fprodconst  14412  fprodn0  14413
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