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Theorem fprodcom2 14639
 Description: Interchange order of multiplication. Note that 𝐵(𝑗) and 𝐷(𝑘) are not necessarily constant expressions. (Contributed by Scott Fenton, 1-Feb-2018.) (Proof shortened by JJ, 2-Aug-2021.)
Hypotheses
Ref Expression
fprodcom2.1 (𝜑𝐴 ∈ Fin)
fprodcom2.2 (𝜑𝐶 ∈ Fin)
fprodcom2.3 ((𝜑𝑗𝐴) → 𝐵 ∈ Fin)
fprodcom2.4 (𝜑 → ((𝑗𝐴𝑘𝐵) ↔ (𝑘𝐶𝑗𝐷)))
fprodcom2.5 ((𝜑 ∧ (𝑗𝐴𝑘𝐵)) → 𝐸 ∈ ℂ)
Assertion
Ref Expression
fprodcom2 (𝜑 → ∏𝑗𝐴𝑘𝐵 𝐸 = ∏𝑘𝐶𝑗𝐷 𝐸)
Distinct variable groups:   𝐴,𝑗,𝑘   𝐵,𝑘   𝐶,𝑗,𝑘   𝐷,𝑗   𝜑,𝑗,𝑘
Allowed substitution hints:   𝐵(𝑗)   𝐷(𝑘)   𝐸(𝑗,𝑘)

Proof of Theorem fprodcom2
Dummy variables 𝑥 𝑦 𝑧 𝑤 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 relxp 5188 . . . . . . . . 9 Rel ({𝑗} × 𝐵)
21rgenw 2919 . . . . . . . 8 𝑗𝐴 Rel ({𝑗} × 𝐵)
3 reliun 5200 . . . . . . . 8 (Rel 𝑗𝐴 ({𝑗} × 𝐵) ↔ ∀𝑗𝐴 Rel ({𝑗} × 𝐵))
42, 3mpbir 221 . . . . . . 7 Rel 𝑗𝐴 ({𝑗} × 𝐵)
5 relcnv 5462 . . . . . . 7 Rel 𝑘𝐶 ({𝑘} × 𝐷)
6 ancom 466 . . . . . . . . . . . 12 ((𝑥 = 𝑗𝑦 = 𝑘) ↔ (𝑦 = 𝑘𝑥 = 𝑗))
7 vex 3189 . . . . . . . . . . . . 13 𝑥 ∈ V
8 vex 3189 . . . . . . . . . . . . 13 𝑦 ∈ V
97, 8opth 4905 . . . . . . . . . . . 12 (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ↔ (𝑥 = 𝑗𝑦 = 𝑘))
108, 7opth 4905 . . . . . . . . . . . 12 (⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ↔ (𝑦 = 𝑘𝑥 = 𝑗))
116, 9, 103bitr4i 292 . . . . . . . . . . 11 (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ↔ ⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩)
1211a1i 11 . . . . . . . . . 10 (𝜑 → (⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ↔ ⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩))
13 fprodcom2.4 . . . . . . . . . 10 (𝜑 → ((𝑗𝐴𝑘𝐵) ↔ (𝑘𝐶𝑗𝐷)))
1412, 13anbi12d 746 . . . . . . . . 9 (𝜑 → ((⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗𝐴𝑘𝐵)) ↔ (⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷))))
15142exbidv 1849 . . . . . . . 8 (𝜑 → (∃𝑗𝑘(⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗𝐴𝑘𝐵)) ↔ ∃𝑗𝑘(⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷))))
16 eliunxp 5219 . . . . . . . 8 (⟨𝑥, 𝑦⟩ ∈ 𝑗𝐴 ({𝑗} × 𝐵) ↔ ∃𝑗𝑘(⟨𝑥, 𝑦⟩ = ⟨𝑗, 𝑘⟩ ∧ (𝑗𝐴𝑘𝐵)))
177, 8opelcnv 5264 . . . . . . . . 9 (⟨𝑥, 𝑦⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷) ↔ ⟨𝑦, 𝑥⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷))
18 eliunxp 5219 . . . . . . . . 9 (⟨𝑦, 𝑥⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷) ↔ ∃𝑘𝑗(⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷)))
19 excom 2039 . . . . . . . . 9 (∃𝑘𝑗(⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷)) ↔ ∃𝑗𝑘(⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷)))
2017, 18, 193bitri 286 . . . . . . . 8 (⟨𝑥, 𝑦⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷) ↔ ∃𝑗𝑘(⟨𝑦, 𝑥⟩ = ⟨𝑘, 𝑗⟩ ∧ (𝑘𝐶𝑗𝐷)))
2115, 16, 203bitr4g 303 . . . . . . 7 (𝜑 → (⟨𝑥, 𝑦⟩ ∈ 𝑗𝐴 ({𝑗} × 𝐵) ↔ ⟨𝑥, 𝑦⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷)))
224, 5, 21eqrelrdv 5177 . . . . . 6 (𝜑 𝑗𝐴 ({𝑗} × 𝐵) = 𝑘𝐶 ({𝑘} × 𝐷))
23 nfcv 2761 . . . . . . 7 𝑥({𝑗} × 𝐵)
24 nfcv 2761 . . . . . . . 8 𝑗{𝑥}
25 nfcsb1v 3530 . . . . . . . 8 𝑗𝑥 / 𝑗𝐵
2624, 25nfxp 5102 . . . . . . 7 𝑗({𝑥} × 𝑥 / 𝑗𝐵)
27 sneq 4158 . . . . . . . 8 (𝑗 = 𝑥 → {𝑗} = {𝑥})
28 csbeq1a 3523 . . . . . . . 8 (𝑗 = 𝑥𝐵 = 𝑥 / 𝑗𝐵)
2927, 28xpeq12d 5100 . . . . . . 7 (𝑗 = 𝑥 → ({𝑗} × 𝐵) = ({𝑥} × 𝑥 / 𝑗𝐵))
3023, 26, 29cbviun 4523 . . . . . 6 𝑗𝐴 ({𝑗} × 𝐵) = 𝑥𝐴 ({𝑥} × 𝑥 / 𝑗𝐵)
31 nfcv 2761 . . . . . . . 8 𝑦({𝑘} × 𝐷)
32 nfcv 2761 . . . . . . . . 9 𝑘{𝑦}
33 nfcsb1v 3530 . . . . . . . . 9 𝑘𝑦 / 𝑘𝐷
3432, 33nfxp 5102 . . . . . . . 8 𝑘({𝑦} × 𝑦 / 𝑘𝐷)
35 sneq 4158 . . . . . . . . 9 (𝑘 = 𝑦 → {𝑘} = {𝑦})
36 csbeq1a 3523 . . . . . . . . 9 (𝑘 = 𝑦𝐷 = 𝑦 / 𝑘𝐷)
3735, 36xpeq12d 5100 . . . . . . . 8 (𝑘 = 𝑦 → ({𝑘} × 𝐷) = ({𝑦} × 𝑦 / 𝑘𝐷))
3831, 34, 37cbviun 4523 . . . . . . 7 𝑘𝐶 ({𝑘} × 𝐷) = 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)
3938cnveqi 5257 . . . . . 6 𝑘𝐶 ({𝑘} × 𝐷) = 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)
4022, 30, 393eqtr3g 2678 . . . . 5 (𝜑 𝑥𝐴 ({𝑥} × 𝑥 / 𝑗𝐵) = 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷))
4140prodeq1d 14576 . . . 4 (𝜑 → ∏𝑧 𝑥𝐴 ({𝑥} × 𝑥 / 𝑗𝐵)(2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸 = ∏𝑧 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)(2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸)
428, 7op1std 7123 . . . . . . 7 (𝑤 = ⟨𝑦, 𝑥⟩ → (1st𝑤) = 𝑦)
4342csbeq1d 3521 . . . . . 6 (𝑤 = ⟨𝑦, 𝑥⟩ → (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 = 𝑦 / 𝑘(2nd𝑤) / 𝑗𝐸)
448, 7op2ndd 7124 . . . . . . . 8 (𝑤 = ⟨𝑦, 𝑥⟩ → (2nd𝑤) = 𝑥)
4544csbeq1d 3521 . . . . . . 7 (𝑤 = ⟨𝑦, 𝑥⟩ → (2nd𝑤) / 𝑗𝐸 = 𝑥 / 𝑗𝐸)
4645csbeq2dv 3964 . . . . . 6 (𝑤 = ⟨𝑦, 𝑥⟩ → 𝑦 / 𝑘(2nd𝑤) / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
4743, 46eqtrd 2655 . . . . 5 (𝑤 = ⟨𝑦, 𝑥⟩ → (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
487, 8op2ndd 7124 . . . . . . 7 (𝑧 = ⟨𝑥, 𝑦⟩ → (2nd𝑧) = 𝑦)
4948csbeq1d 3521 . . . . . 6 (𝑧 = ⟨𝑥, 𝑦⟩ → (2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸 = 𝑦 / 𝑘(1st𝑧) / 𝑗𝐸)
507, 8op1std 7123 . . . . . . . 8 (𝑧 = ⟨𝑥, 𝑦⟩ → (1st𝑧) = 𝑥)
5150csbeq1d 3521 . . . . . . 7 (𝑧 = ⟨𝑥, 𝑦⟩ → (1st𝑧) / 𝑗𝐸 = 𝑥 / 𝑗𝐸)
5251csbeq2dv 3964 . . . . . 6 (𝑧 = ⟨𝑥, 𝑦⟩ → 𝑦 / 𝑘(1st𝑧) / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
5349, 52eqtrd 2655 . . . . 5 (𝑧 = ⟨𝑥, 𝑦⟩ → (2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
54 fprodcom2.2 . . . . . 6 (𝜑𝐶 ∈ Fin)
55 snfi 7982 . . . . . . . 8 {𝑦} ∈ Fin
56 fprodcom2.1 . . . . . . . . . 10 (𝜑𝐴 ∈ Fin)
5756adantr 481 . . . . . . . . 9 ((𝜑𝑦𝐶) → 𝐴 ∈ Fin)
5833, 36opeliunxp2f 7281 . . . . . . . . . . . . . . . 16 (⟨𝑦, 𝑥⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷) ↔ (𝑦𝐶𝑥𝑦 / 𝑘𝐷))
5917, 58sylbbr 226 . . . . . . . . . . . . . . 15 ((𝑦𝐶𝑥𝑦 / 𝑘𝐷) → ⟨𝑥, 𝑦⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷))
6059adantl 482 . . . . . . . . . . . . . 14 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → ⟨𝑥, 𝑦⟩ ∈ 𝑘𝐶 ({𝑘} × 𝐷))
6122adantr 481 . . . . . . . . . . . . . 14 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → 𝑗𝐴 ({𝑗} × 𝐵) = 𝑘𝐶 ({𝑘} × 𝐷))
6260, 61eleqtrrd 2701 . . . . . . . . . . . . 13 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → ⟨𝑥, 𝑦⟩ ∈ 𝑗𝐴 ({𝑗} × 𝐵))
63 eliun 4490 . . . . . . . . . . . . 13 (⟨𝑥, 𝑦⟩ ∈ 𝑗𝐴 ({𝑗} × 𝐵) ↔ ∃𝑗𝐴𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵))
6462, 63sylib 208 . . . . . . . . . . . 12 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → ∃𝑗𝐴𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵))
65 simpr 477 . . . . . . . . . . . . . . . . 17 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵))
66 opelxp 5106 . . . . . . . . . . . . . . . . 17 (⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵) ↔ (𝑥 ∈ {𝑗} ∧ 𝑦𝐵))
6765, 66sylib 208 . . . . . . . . . . . . . . . 16 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → (𝑥 ∈ {𝑗} ∧ 𝑦𝐵))
6867simpld 475 . . . . . . . . . . . . . . 15 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → 𝑥 ∈ {𝑗})
69 elsni 4165 . . . . . . . . . . . . . . 15 (𝑥 ∈ {𝑗} → 𝑥 = 𝑗)
7068, 69syl 17 . . . . . . . . . . . . . 14 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → 𝑥 = 𝑗)
71 simpl 473 . . . . . . . . . . . . . 14 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → 𝑗𝐴)
7270, 71eqeltrd 2698 . . . . . . . . . . . . 13 ((𝑗𝐴 ∧ ⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵)) → 𝑥𝐴)
7372rexlimiva 3021 . . . . . . . . . . . 12 (∃𝑗𝐴𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵) → 𝑥𝐴)
7464, 73syl 17 . . . . . . . . . . 11 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → 𝑥𝐴)
7574expr 642 . . . . . . . . . 10 ((𝜑𝑦𝐶) → (𝑥𝑦 / 𝑘𝐷𝑥𝐴))
7675ssrdv 3589 . . . . . . . . 9 ((𝜑𝑦𝐶) → 𝑦 / 𝑘𝐷𝐴)
7757, 76ssfid 8127 . . . . . . . 8 ((𝜑𝑦𝐶) → 𝑦 / 𝑘𝐷 ∈ Fin)
78 xpfi 8175 . . . . . . . 8 (({𝑦} ∈ Fin ∧ 𝑦 / 𝑘𝐷 ∈ Fin) → ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin)
7955, 77, 78sylancr 694 . . . . . . 7 ((𝜑𝑦𝐶) → ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin)
8079ralrimiva 2960 . . . . . 6 (𝜑 → ∀𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin)
81 iunfi 8198 . . . . . 6 ((𝐶 ∈ Fin ∧ ∀𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin) → 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin)
8254, 80, 81syl2anc 692 . . . . 5 (𝜑 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ∈ Fin)
83 reliun 5200 . . . . . . 7 (Rel 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ↔ ∀𝑦𝐶 Rel ({𝑦} × 𝑦 / 𝑘𝐷))
84 relxp 5188 . . . . . . . 8 Rel ({𝑦} × 𝑦 / 𝑘𝐷)
8584a1i 11 . . . . . . 7 (𝑦𝐶 → Rel ({𝑦} × 𝑦 / 𝑘𝐷))
8683, 85mprgbir 2922 . . . . . 6 Rel 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)
8786a1i 11 . . . . 5 (𝜑 → Rel 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷))
88 simpr 477 . . . . . . . 8 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → 𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷))
89 eliun 4490 . . . . . . . 8 (𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷) ↔ ∃𝑦𝐶 𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷))
9088, 89sylib 208 . . . . . . 7 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → ∃𝑦𝐶 𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷))
91 xp2nd 7144 . . . . . . . . . 10 (𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷) → (2nd𝑤) ∈ 𝑦 / 𝑘𝐷)
9291adantl 482 . . . . . . . . 9 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (2nd𝑤) ∈ 𝑦 / 𝑘𝐷)
93 xp1st 7143 . . . . . . . . . . . 12 (𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷) → (1st𝑤) ∈ {𝑦})
9493adantl 482 . . . . . . . . . . 11 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) ∈ {𝑦})
95 elsni 4165 . . . . . . . . . . 11 ((1st𝑤) ∈ {𝑦} → (1st𝑤) = 𝑦)
9694, 95syl 17 . . . . . . . . . 10 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) = 𝑦)
9796csbeq1d 3521 . . . . . . . . 9 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) / 𝑘𝐷 = 𝑦 / 𝑘𝐷)
9892, 97eleqtrrd 2701 . . . . . . . 8 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (2nd𝑤) ∈ (1st𝑤) / 𝑘𝐷)
9998rexlimiva 3021 . . . . . . 7 (∃𝑦𝐶 𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷) → (2nd𝑤) ∈ (1st𝑤) / 𝑘𝐷)
10090, 99syl 17 . . . . . 6 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → (2nd𝑤) ∈ (1st𝑤) / 𝑘𝐷)
101 simpl 473 . . . . . . . . . 10 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → 𝑦𝐶)
10296, 101eqeltrd 2698 . . . . . . . . 9 ((𝑦𝐶𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) ∈ 𝐶)
103102rexlimiva 3021 . . . . . . . 8 (∃𝑦𝐶 𝑤 ∈ ({𝑦} × 𝑦 / 𝑘𝐷) → (1st𝑤) ∈ 𝐶)
10490, 103syl 17 . . . . . . 7 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) ∈ 𝐶)
105 simpl 473 . . . . . . . . . 10 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → 𝜑)
10625nfcri 2755 . . . . . . . . . . . 12 𝑗 𝑦𝑥 / 𝑗𝐵
10769equcomd 1943 . . . . . . . . . . . . . . . . 17 (𝑥 ∈ {𝑗} → 𝑗 = 𝑥)
108107, 28syl 17 . . . . . . . . . . . . . . . 16 (𝑥 ∈ {𝑗} → 𝐵 = 𝑥 / 𝑗𝐵)
109108eleq2d 2684 . . . . . . . . . . . . . . 15 (𝑥 ∈ {𝑗} → (𝑦𝐵𝑦𝑥 / 𝑗𝐵))
110109biimpa 501 . . . . . . . . . . . . . 14 ((𝑥 ∈ {𝑗} ∧ 𝑦𝐵) → 𝑦𝑥 / 𝑗𝐵)
11166, 110sylbi 207 . . . . . . . . . . . . 13 (⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵) → 𝑦𝑥 / 𝑗𝐵)
112111a1i 11 . . . . . . . . . . . 12 (𝑗𝐴 → (⟨𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵) → 𝑦𝑥 / 𝑗𝐵))
113106, 112rexlimi 3017 . . . . . . . . . . 11 (∃𝑗𝐴𝑥, 𝑦⟩ ∈ ({𝑗} × 𝐵) → 𝑦𝑥 / 𝑗𝐵)
11464, 113syl 17 . . . . . . . . . 10 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → 𝑦𝑥 / 𝑗𝐵)
115 fprodcom2.5 . . . . . . . . . . . . . 14 ((𝜑 ∧ (𝑗𝐴𝑘𝐵)) → 𝐸 ∈ ℂ)
116115ralrimivva 2965 . . . . . . . . . . . . 13 (𝜑 → ∀𝑗𝐴𝑘𝐵 𝐸 ∈ ℂ)
117 nfcsb1v 3530 . . . . . . . . . . . . . . . 16 𝑗𝑥 / 𝑗𝐸
118117nfel1 2775 . . . . . . . . . . . . . . 15 𝑗𝑥 / 𝑗𝐸 ∈ ℂ
11925, 118nfral 2940 . . . . . . . . . . . . . 14 𝑗𝑘 𝑥 / 𝑗𝐵𝑥 / 𝑗𝐸 ∈ ℂ
120 csbeq1a 3523 . . . . . . . . . . . . . . . 16 (𝑗 = 𝑥𝐸 = 𝑥 / 𝑗𝐸)
121120eleq1d 2683 . . . . . . . . . . . . . . 15 (𝑗 = 𝑥 → (𝐸 ∈ ℂ ↔ 𝑥 / 𝑗𝐸 ∈ ℂ))
12228, 121raleqbidv 3141 . . . . . . . . . . . . . 14 (𝑗 = 𝑥 → (∀𝑘𝐵 𝐸 ∈ ℂ ↔ ∀𝑘 𝑥 / 𝑗𝐵𝑥 / 𝑗𝐸 ∈ ℂ))
123119, 122rspc 3289 . . . . . . . . . . . . 13 (𝑥𝐴 → (∀𝑗𝐴𝑘𝐵 𝐸 ∈ ℂ → ∀𝑘 𝑥 / 𝑗𝐵𝑥 / 𝑗𝐸 ∈ ℂ))
124116, 123mpan9 486 . . . . . . . . . . . 12 ((𝜑𝑥𝐴) → ∀𝑘 𝑥 / 𝑗𝐵𝑥 / 𝑗𝐸 ∈ ℂ)
125 nfcsb1v 3530 . . . . . . . . . . . . . 14 𝑘𝑦 / 𝑘𝑥 / 𝑗𝐸
126125nfel1 2775 . . . . . . . . . . . . 13 𝑘𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ
127 csbeq1a 3523 . . . . . . . . . . . . . 14 (𝑘 = 𝑦𝑥 / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
128127eleq1d 2683 . . . . . . . . . . . . 13 (𝑘 = 𝑦 → (𝑥 / 𝑗𝐸 ∈ ℂ ↔ 𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
129126, 128rspc 3289 . . . . . . . . . . . 12 (𝑦𝑥 / 𝑗𝐵 → (∀𝑘 𝑥 / 𝑗𝐵𝑥 / 𝑗𝐸 ∈ ℂ → 𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
130124, 129syl5com 31 . . . . . . . . . . 11 ((𝜑𝑥𝐴) → (𝑦𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
131130impr 648 . . . . . . . . . 10 ((𝜑 ∧ (𝑥𝐴𝑦𝑥 / 𝑗𝐵)) → 𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ)
132105, 74, 114, 131syl12anc 1321 . . . . . . . . 9 ((𝜑 ∧ (𝑦𝐶𝑥𝑦 / 𝑘𝐷)) → 𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ)
133132ralrimivva 2965 . . . . . . . 8 (𝜑 → ∀𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ)
134133adantr 481 . . . . . . 7 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → ∀𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ)
135 csbeq1 3517 . . . . . . . . 9 (𝑦 = (1st𝑤) → 𝑦 / 𝑘𝐷 = (1st𝑤) / 𝑘𝐷)
136 csbeq1 3517 . . . . . . . . . 10 (𝑦 = (1st𝑤) → 𝑦 / 𝑘𝑥 / 𝑗𝐸 = (1st𝑤) / 𝑘𝑥 / 𝑗𝐸)
137136eleq1d 2683 . . . . . . . . 9 (𝑦 = (1st𝑤) → (𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ ↔ (1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
138135, 137raleqbidv 3141 . . . . . . . 8 (𝑦 = (1st𝑤) → (∀𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ ↔ ∀𝑥 (1st𝑤) / 𝑘𝐷(1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
139138rspcv 3291 . . . . . . 7 ((1st𝑤) ∈ 𝐶 → (∀𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ → ∀𝑥 (1st𝑤) / 𝑘𝐷(1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ))
140104, 134, 139sylc 65 . . . . . 6 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → ∀𝑥 (1st𝑤) / 𝑘𝐷(1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ)
141 csbeq1 3517 . . . . . . . . 9 (𝑥 = (2nd𝑤) → 𝑥 / 𝑗𝐸 = (2nd𝑤) / 𝑗𝐸)
142141csbeq2dv 3964 . . . . . . . 8 (𝑥 = (2nd𝑤) → (1st𝑤) / 𝑘𝑥 / 𝑗𝐸 = (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸)
143142eleq1d 2683 . . . . . . 7 (𝑥 = (2nd𝑤) → ((1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ ↔ (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 ∈ ℂ))
144143rspcv 3291 . . . . . 6 ((2nd𝑤) ∈ (1st𝑤) / 𝑘𝐷 → (∀𝑥 (1st𝑤) / 𝑘𝐷(1st𝑤) / 𝑘𝑥 / 𝑗𝐸 ∈ ℂ → (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 ∈ ℂ))
145100, 140, 144sylc 65 . . . . 5 ((𝜑𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)) → (1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 ∈ ℂ)
14647, 53, 82, 87, 145fprodcnv 14638 . . . 4 (𝜑 → ∏𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)(1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸 = ∏𝑧 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)(2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸)
14741, 146eqtr4d 2658 . . 3 (𝜑 → ∏𝑧 𝑥𝐴 ({𝑥} × 𝑥 / 𝑗𝐵)(2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸 = ∏𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)(1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸)
148 fprodcom2.3 . . . . . 6 ((𝜑𝑗𝐴) → 𝐵 ∈ Fin)
149148ralrimiva 2960 . . . . 5 (𝜑 → ∀𝑗𝐴 𝐵 ∈ Fin)
15025nfel1 2775 . . . . . 6 𝑗𝑥 / 𝑗𝐵 ∈ Fin
15128eleq1d 2683 . . . . . 6 (𝑗 = 𝑥 → (𝐵 ∈ Fin ↔ 𝑥 / 𝑗𝐵 ∈ Fin))
152150, 151rspc 3289 . . . . 5 (𝑥𝐴 → (∀𝑗𝐴 𝐵 ∈ Fin → 𝑥 / 𝑗𝐵 ∈ Fin))
153149, 152mpan9 486 . . . 4 ((𝜑𝑥𝐴) → 𝑥 / 𝑗𝐵 ∈ Fin)
15453, 56, 153, 131fprod2d 14636 . . 3 (𝜑 → ∏𝑥𝐴𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸 = ∏𝑧 𝑥𝐴 ({𝑥} × 𝑥 / 𝑗𝐵)(2nd𝑧) / 𝑘(1st𝑧) / 𝑗𝐸)
15547, 54, 77, 132fprod2d 14636 . . 3 (𝜑 → ∏𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸 = ∏𝑤 𝑦𝐶 ({𝑦} × 𝑦 / 𝑘𝐷)(1st𝑤) / 𝑘(2nd𝑤) / 𝑗𝐸)
156147, 154, 1553eqtr4d 2665 . 2 (𝜑 → ∏𝑥𝐴𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸 = ∏𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸)
157 nfcv 2761 . . 3 𝑥𝑘𝐵 𝐸
158 nfcv 2761 . . . . 5 𝑗𝑦
159158, 117nfcsb 3532 . . . 4 𝑗𝑦 / 𝑘𝑥 / 𝑗𝐸
16025, 159nfcprod 14566 . . 3 𝑗𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸
161 nfcv 2761 . . . . 5 𝑦𝐸
162 nfcsb1v 3530 . . . . 5 𝑘𝑦 / 𝑘𝐸
163 csbeq1a 3523 . . . . 5 (𝑘 = 𝑦𝐸 = 𝑦 / 𝑘𝐸)
164161, 162, 163cbvprodi 14572 . . . 4 𝑘𝐵 𝐸 = ∏𝑦𝐵 𝑦 / 𝑘𝐸
165120csbeq2dv 3964 . . . . . 6 (𝑗 = 𝑥𝑦 / 𝑘𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
166165adantr 481 . . . . 5 ((𝑗 = 𝑥𝑦𝐵) → 𝑦 / 𝑘𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
16728, 166prodeq12dv 14581 . . . 4 (𝑗 = 𝑥 → ∏𝑦𝐵 𝑦 / 𝑘𝐸 = ∏𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸)
168164, 167syl5eq 2667 . . 3 (𝑗 = 𝑥 → ∏𝑘𝐵 𝐸 = ∏𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸)
169157, 160, 168cbvprodi 14572 . 2 𝑗𝐴𝑘𝐵 𝐸 = ∏𝑥𝐴𝑦 𝑥 / 𝑗𝐵𝑦 / 𝑘𝑥 / 𝑗𝐸
170 nfcv 2761 . . 3 𝑦𝑗𝐷 𝐸
17133, 125nfcprod 14566 . . 3 𝑘𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸
172 nfcv 2761 . . . . 5 𝑥𝐸
173172, 117, 120cbvprodi 14572 . . . 4 𝑗𝐷 𝐸 = ∏𝑥𝐷 𝑥 / 𝑗𝐸
174127adantr 481 . . . . 5 ((𝑘 = 𝑦𝑥𝐷) → 𝑥 / 𝑗𝐸 = 𝑦 / 𝑘𝑥 / 𝑗𝐸)
17536, 174prodeq12dv 14581 . . . 4 (𝑘 = 𝑦 → ∏𝑥𝐷 𝑥 / 𝑗𝐸 = ∏𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸)
176173, 175syl5eq 2667 . . 3 (𝑘 = 𝑦 → ∏𝑗𝐷 𝐸 = ∏𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸)
177170, 171, 176cbvprodi 14572 . 2 𝑘𝐶𝑗𝐷 𝐸 = ∏𝑦𝐶𝑥 𝑦 / 𝑘𝐷𝑦 / 𝑘𝑥 / 𝑗𝐸
178156, 169, 1773eqtr4g 2680 1 (𝜑 → ∏𝑗𝐴𝑘𝐵 𝐸 = ∏𝑘𝐶𝑗𝐷 𝐸)
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   ∧ wa 384   = wceq 1480  ∃wex 1701   ∈ wcel 1987  ∀wral 2907  ∃wrex 2908  ⦋csb 3514  {csn 4148  ⟨cop 4154  ∪ ciun 4485   × cxp 5072  ◡ccnv 5073  Rel wrel 5079  ‘cfv 5847  1st c1st 7111  2nd c2nd 7112  Fincfn 7899  ℂcc 9878  ∏cprod 14560 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 4731  ax-sep 4741  ax-nul 4749  ax-pow 4803  ax-pr 4867  ax-un 6902  ax-inf2 8482  ax-cnex 9936  ax-resscn 9937  ax-1cn 9938  ax-icn 9939  ax-addcl 9940  ax-addrcl 9941  ax-mulcl 9942  ax-mulrcl 9943  ax-mulcom 9944  ax-addass 9945  ax-mulass 9946  ax-distr 9947  ax-i2m1 9948  ax-1ne0 9949  ax-1rid 9950  ax-rnegex 9951  ax-rrecex 9952  ax-cnre 9953  ax-pre-lttri 9954  ax-pre-lttrn 9955  ax-pre-ltadd 9956  ax-pre-mulgt0 9957  ax-pre-sup 9958 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 3418  df-csb 3515  df-dif 3558  df-un 3560  df-in 3562  df-ss 3569  df-pss 3571  df-nul 3892  df-if 4059  df-pw 4132  df-sn 4149  df-pr 4151  df-tp 4153  df-op 4155  df-uni 4403  df-int 4441  df-iun 4487  df-br 4614  df-opab 4674  df-mpt 4675  df-tr 4713  df-eprel 4985  df-id 4989  df-po 4995  df-so 4996  df-fr 5033  df-se 5034  df-we 5035  df-xp 5080  df-rel 5081  df-cnv 5082  df-co 5083  df-dm 5084  df-rn 5085  df-res 5086  df-ima 5087  df-pred 5639  df-ord 5685  df-on 5686  df-lim 5687  df-suc 5688  df-iota 5810  df-fun 5849  df-fn 5850  df-f 5851  df-f1 5852  df-fo 5853  df-f1o 5854  df-fv 5855  df-isom 5856  df-riota 6565  df-ov 6607  df-oprab 6608  df-mpt2 6609  df-om 7013  df-1st 7113  df-2nd 7114  df-wrecs 7352  df-recs 7413  df-rdg 7451  df-1o 7505  df-oadd 7509  df-er 7687  df-en 7900  df-dom 7901  df-sdom 7902  df-fin 7903  df-sup 8292  df-oi 8359  df-card 8709  df-pnf 10020  df-mnf 10021  df-xr 10022  df-ltxr 10023  df-le 10024  df-sub 10212  df-neg 10213  df-div 10629  df-nn 10965  df-2 11023  df-3 11024  df-n0 11237  df-z 11322  df-uz 11632  df-rp 11777  df-fz 12269  df-fzo 12407  df-seq 12742  df-exp 12801  df-hash 13058  df-cj 13773  df-re 13774  df-im 13775  df-sqrt 13909  df-abs 13910  df-clim 14153  df-prod 14561 This theorem is referenced by:  fprodcom  14641  fprod0diag  14642
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