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Theorem fsumabs 14460
Description: Generalized triangle inequality: the absolute value of a finite sum is less than or equal to the sum of absolute values. (Contributed by NM, 9-Nov-2005.) (Revised by Mario Carneiro, 24-Apr-2014.)
Hypotheses
Ref Expression
fsumabs.1 (𝜑𝐴 ∈ Fin)
fsumabs.2 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
Assertion
Ref Expression
fsumabs (𝜑 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))
Distinct variable groups:   𝐴,𝑘   𝜑,𝑘
Allowed substitution hint:   𝐵(𝑘)

Proof of Theorem fsumabs
Dummy variables 𝑤 𝑥 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 ssid 3603 . 2 𝐴𝐴
2 fsumabs.1 . . 3 (𝜑𝐴 ∈ Fin)
3 sseq1 3605 . . . . . 6 (𝑤 = ∅ → (𝑤𝐴 ↔ ∅ ⊆ 𝐴))
4 sumeq1 14353 . . . . . . . 8 (𝑤 = ∅ → Σ𝑘𝑤 𝐵 = Σ𝑘 ∈ ∅ 𝐵)
54fveq2d 6152 . . . . . . 7 (𝑤 = ∅ → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘 ∈ ∅ 𝐵))
6 sumeq1 14353 . . . . . . 7 (𝑤 = ∅ → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘 ∈ ∅ (abs‘𝐵))
75, 6breq12d 4626 . . . . . 6 (𝑤 = ∅ → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))
83, 7imbi12d 334 . . . . 5 (𝑤 = ∅ → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵))))
98imbi2d 330 . . . 4 (𝑤 = ∅ → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))))
10 sseq1 3605 . . . . . 6 (𝑤 = 𝑥 → (𝑤𝐴𝑥𝐴))
11 sumeq1 14353 . . . . . . . 8 (𝑤 = 𝑥 → Σ𝑘𝑤 𝐵 = Σ𝑘𝑥 𝐵)
1211fveq2d 6152 . . . . . . 7 (𝑤 = 𝑥 → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘𝑥 𝐵))
13 sumeq1 14353 . . . . . . 7 (𝑤 = 𝑥 → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘𝑥 (abs‘𝐵))
1412, 13breq12d 4626 . . . . . 6 (𝑤 = 𝑥 → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))
1510, 14imbi12d 334 . . . . 5 (𝑤 = 𝑥 → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵))))
1615imbi2d 330 . . . 4 (𝑤 = 𝑥 → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))))
17 sseq1 3605 . . . . . 6 (𝑤 = (𝑥 ∪ {𝑦}) → (𝑤𝐴 ↔ (𝑥 ∪ {𝑦}) ⊆ 𝐴))
18 sumeq1 14353 . . . . . . . 8 (𝑤 = (𝑥 ∪ {𝑦}) → Σ𝑘𝑤 𝐵 = Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵)
1918fveq2d 6152 . . . . . . 7 (𝑤 = (𝑥 ∪ {𝑦}) → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵))
20 sumeq1 14353 . . . . . . 7 (𝑤 = (𝑥 ∪ {𝑦}) → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))
2119, 20breq12d 4626 . . . . . 6 (𝑤 = (𝑥 ∪ {𝑦}) → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
2217, 21imbi12d 334 . . . . 5 (𝑤 = (𝑥 ∪ {𝑦}) → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
2322imbi2d 330 . . . 4 (𝑤 = (𝑥 ∪ {𝑦}) → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))))
24 sseq1 3605 . . . . . 6 (𝑤 = 𝐴 → (𝑤𝐴𝐴𝐴))
25 sumeq1 14353 . . . . . . . 8 (𝑤 = 𝐴 → Σ𝑘𝑤 𝐵 = Σ𝑘𝐴 𝐵)
2625fveq2d 6152 . . . . . . 7 (𝑤 = 𝐴 → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘𝐴 𝐵))
27 sumeq1 14353 . . . . . . 7 (𝑤 = 𝐴 → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘𝐴 (abs‘𝐵))
2826, 27breq12d 4626 . . . . . 6 (𝑤 = 𝐴 → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))
2924, 28imbi12d 334 . . . . 5 (𝑤 = 𝐴 → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))))
3029imbi2d 330 . . . 4 (𝑤 = 𝐴 → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))))
31 0le0 11054 . . . . . 6 0 ≤ 0
32 sum0 14385 . . . . . . . 8 Σ𝑘 ∈ ∅ 𝐵 = 0
3332fveq2i 6151 . . . . . . 7 (abs‘Σ𝑘 ∈ ∅ 𝐵) = (abs‘0)
34 abs0 13959 . . . . . . 7 (abs‘0) = 0
3533, 34eqtri 2643 . . . . . 6 (abs‘Σ𝑘 ∈ ∅ 𝐵) = 0
36 sum0 14385 . . . . . 6 Σ𝑘 ∈ ∅ (abs‘𝐵) = 0
3731, 35, 363brtr4i 4643 . . . . 5 (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)
38372a1i 12 . . . 4 (𝜑 → (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))
39 ssun1 3754 . . . . . . . . . 10 𝑥 ⊆ (𝑥 ∪ {𝑦})
40 sstr 3591 . . . . . . . . . 10 ((𝑥 ⊆ (𝑥 ∪ {𝑦}) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥𝐴)
4139, 40mpan 705 . . . . . . . . 9 ((𝑥 ∪ {𝑦}) ⊆ 𝐴𝑥𝐴)
4241imim1i 63 . . . . . . . 8 ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))
43 simpll 789 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝜑)
4443, 2syl 17 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝐴 ∈ Fin)
45 simpr 477 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ⊆ 𝐴)
4645unssad 3768 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥𝐴)
47 ssfi 8124 . . . . . . . . . . . . . . . 16 ((𝐴 ∈ Fin ∧ 𝑥𝐴) → 𝑥 ∈ Fin)
4844, 46, 47syl2anc 692 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥 ∈ Fin)
4946sselda 3583 . . . . . . . . . . . . . . . 16 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → 𝑘𝐴)
50 fsumabs.2 . . . . . . . . . . . . . . . . 17 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
5143, 50sylan 488 . . . . . . . . . . . . . . . 16 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝐴) → 𝐵 ∈ ℂ)
5249, 51syldan 487 . . . . . . . . . . . . . . 15 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → 𝐵 ∈ ℂ)
5348, 52fsumcl 14397 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘𝑥 𝐵 ∈ ℂ)
5453abscld 14109 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘𝑥 𝐵) ∈ ℝ)
5552abscld 14109 . . . . . . . . . . . . . 14 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → (abs‘𝐵) ∈ ℝ)
5648, 55fsumrecl 14398 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘𝑥 (abs‘𝐵) ∈ ℝ)
5745unssbd 3769 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → {𝑦} ⊆ 𝐴)
58 vex 3189 . . . . . . . . . . . . . . . . 17 𝑦 ∈ V
5958snss 4286 . . . . . . . . . . . . . . . 16 (𝑦𝐴 ↔ {𝑦} ⊆ 𝐴)
6057, 59sylibr 224 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦𝐴)
6150ralrimiva 2960 . . . . . . . . . . . . . . . 16 (𝜑 → ∀𝑘𝐴 𝐵 ∈ ℂ)
6243, 61syl 17 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ∀𝑘𝐴 𝐵 ∈ ℂ)
63 nfcsb1v 3530 . . . . . . . . . . . . . . . . 17 𝑘𝑦 / 𝑘𝐵
6463nfel1 2775 . . . . . . . . . . . . . . . 16 𝑘𝑦 / 𝑘𝐵 ∈ ℂ
65 csbeq1a 3523 . . . . . . . . . . . . . . . . 17 (𝑘 = 𝑦𝐵 = 𝑦 / 𝑘𝐵)
6665eleq1d 2683 . . . . . . . . . . . . . . . 16 (𝑘 = 𝑦 → (𝐵 ∈ ℂ ↔ 𝑦 / 𝑘𝐵 ∈ ℂ))
6764, 66rspc 3289 . . . . . . . . . . . . . . 15 (𝑦𝐴 → (∀𝑘𝐴 𝐵 ∈ ℂ → 𝑦 / 𝑘𝐵 ∈ ℂ))
6860, 62, 67sylc 65 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘𝐵 ∈ ℂ)
6968abscld 14109 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘𝑦 / 𝑘𝐵) ∈ ℝ)
7054, 56, 69leadd1d 10565 . . . . . . . . . . . 12 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) ↔ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵))))
71 simplr 791 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ¬ 𝑦𝑥)
72 disjsn 4216 . . . . . . . . . . . . . . . 16 ((𝑥 ∩ {𝑦}) = ∅ ↔ ¬ 𝑦𝑥)
7371, 72sylibr 224 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∩ {𝑦}) = ∅)
74 eqidd 2622 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) = (𝑥 ∪ {𝑦}))
75 ssfi 8124 . . . . . . . . . . . . . . . 16 ((𝐴 ∈ Fin ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ∈ Fin)
7644, 45, 75syl2anc 692 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ∈ Fin)
7745sselda 3583 . . . . . . . . . . . . . . . . . 18 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → 𝑘𝐴)
7877, 51syldan 487 . . . . . . . . . . . . . . . . 17 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → 𝐵 ∈ ℂ)
7978abscld 14109 . . . . . . . . . . . . . . . 16 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → (abs‘𝐵) ∈ ℝ)
8079recnd 10012 . . . . . . . . . . . . . . 15 ((((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → (abs‘𝐵) ∈ ℂ)
8173, 74, 76, 80fsumsplit 14404 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) = (Σ𝑘𝑥 (abs‘𝐵) + Σ𝑘 ∈ {𝑦} (abs‘𝐵)))
82 csbfv2g 6189 . . . . . . . . . . . . . . . . . . 19 (𝑦 ∈ V → 𝑦 / 𝑘(abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵))
8358, 82ax-mp 5 . . . . . . . . . . . . . . . . . 18 𝑦 / 𝑘(abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵)
8469recnd 10012 . . . . . . . . . . . . . . . . . 18 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘𝑦 / 𝑘𝐵) ∈ ℂ)
8583, 84syl5eqel 2702 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘(abs‘𝐵) ∈ ℂ)
86 sumsns 14409 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ V ∧ 𝑦 / 𝑘(abs‘𝐵) ∈ ℂ) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = 𝑦 / 𝑘(abs‘𝐵))
8758, 85, 86sylancr 694 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = 𝑦 / 𝑘(abs‘𝐵))
8887, 83syl6eq 2671 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵))
8988oveq2d 6620 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 (abs‘𝐵) + Σ𝑘 ∈ {𝑦} (abs‘𝐵)) = (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵)))
9081, 89eqtrd 2655 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) = (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵)))
9190breq2d 4625 . . . . . . . . . . . 12 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) ↔ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵))))
9270, 91bitr4d 271 . . . . . . . . . . 11 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) ↔ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
9373, 74, 76, 78fsumsplit 14404 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 = (Σ𝑘𝑥 𝐵 + Σ𝑘 ∈ {𝑦}𝐵))
94 sumsns 14409 . . . . . . . . . . . . . . . . 17 ((𝑦𝐴𝑦 / 𝑘𝐵 ∈ ℂ) → Σ𝑘 ∈ {𝑦}𝐵 = 𝑦 / 𝑘𝐵)
9560, 68, 94syl2anc 692 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦}𝐵 = 𝑦 / 𝑘𝐵)
9695oveq2d 6620 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 𝐵 + Σ𝑘 ∈ {𝑦}𝐵) = (Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵))
9793, 96eqtrd 2655 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 = (Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵))
9897fveq2d 6152 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) = (abs‘(Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵)))
9953, 68abstrid 14129 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘(Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵)) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)))
10098, 99eqbrtrd 4635 . . . . . . . . . . . 12 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)))
10176, 78fsumcl 14397 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 ∈ ℂ)
102101abscld 14109 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ∈ ℝ)
10354, 69readdcld 10013 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ∈ ℝ)
10476, 79fsumrecl 14398 . . . . . . . . . . . . 13 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) ∈ ℝ)
105 letr 10075 . . . . . . . . . . . . 13 (((abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ∈ ℝ ∧ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ∈ ℝ ∧ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) ∈ ℝ) → (((abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ∧ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
106102, 103, 104, 105syl3anc 1323 . . . . . . . . . . . 12 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (((abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ∧ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
107100, 106mpand 710 . . . . . . . . . . 11 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
10892, 107sylbid 230 . . . . . . . . . 10 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
109108ex 450 . . . . . . . . 9 ((𝜑 ∧ ¬ 𝑦𝑥) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
110109a2d 29 . . . . . . . 8 ((𝜑 ∧ ¬ 𝑦𝑥) → (((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
11142, 110syl5 34 . . . . . . 7 ((𝜑 ∧ ¬ 𝑦𝑥) → ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
112111expcom 451 . . . . . 6 𝑦𝑥 → (𝜑 → ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))))
113112a2d 29 . . . . 5 𝑦𝑥 → ((𝜑 → (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵))) → (𝜑 → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))))
114113adantl 482 . . . 4 ((𝑥 ∈ Fin ∧ ¬ 𝑦𝑥) → ((𝜑 → (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵))) → (𝜑 → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))))
1159, 16, 23, 30, 38, 114findcard2s 8145 . . 3 (𝐴 ∈ Fin → (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))))
1162, 115mpcom 38 . 2 (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))
1171, 116mpi 20 1 (𝜑 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))
Colors of variables: wff setvar class
Syntax hints:  ¬ wn 3  wi 4  wa 384   = wceq 1480  wcel 1987  wral 2907  Vcvv 3186  csb 3514  cun 3553  cin 3554  wss 3555  c0 3891  {csn 4148   class class class wbr 4613  cfv 5847  (class class class)co 6604  Fincfn 7899  cc 9878  cr 9879  0cc0 9880   + caddc 9883  cle 10019  abscabs 13908  Σcsu 14350
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-sum 14351
This theorem is referenced by:  o1fsum  14472  seqabs  14473  cvgcmpce  14477  mertenslem1  14541  dvfsumabs  23690  mtest  24062  mtestbdd  24063  abelthlem7  24096  fsumharmonic  24638  ftalem1  24699  ftalem5  24703  dchrisumlem2  25079  dchrmusum2  25083  dchrvmasumlem3  25088  dchrvmasumiflem1  25090  dchrisum0lem1  25105  dchrisum0lem2a  25106  mudivsum  25119  mulogsumlem  25120  2vmadivsumlem  25129  selberglem2  25135  selberg3lem1  25146  selberg4lem1  25149  pntrsumbnd  25155  pntrlog2bndlem1  25166  pntrlog2bndlem3  25168  knoppndvlem11  32152  fourierdlem73  39700  etransclem23  39778
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