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Theorem fsumabs 11355
 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 3148 . 2 𝐴𝐴
2 fsumabs.1 . . 3 (𝜑𝐴 ∈ Fin)
3 sseq1 3151 . . . . . 6 (𝑤 = ∅ → (𝑤𝐴 ↔ ∅ ⊆ 𝐴))
4 sumeq1 11245 . . . . . . . 8 (𝑤 = ∅ → Σ𝑘𝑤 𝐵 = Σ𝑘 ∈ ∅ 𝐵)
54fveq2d 5471 . . . . . . 7 (𝑤 = ∅ → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘 ∈ ∅ 𝐵))
6 sumeq1 11245 . . . . . . 7 (𝑤 = ∅ → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘 ∈ ∅ (abs‘𝐵))
75, 6breq12d 3978 . . . . . 6 (𝑤 = ∅ → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))
83, 7imbi12d 233 . . . . 5 (𝑤 = ∅ → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵))))
98imbi2d 229 . . . 4 (𝑤 = ∅ → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))))
10 sseq1 3151 . . . . . 6 (𝑤 = 𝑥 → (𝑤𝐴𝑥𝐴))
11 sumeq1 11245 . . . . . . . 8 (𝑤 = 𝑥 → Σ𝑘𝑤 𝐵 = Σ𝑘𝑥 𝐵)
1211fveq2d 5471 . . . . . . 7 (𝑤 = 𝑥 → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘𝑥 𝐵))
13 sumeq1 11245 . . . . . . 7 (𝑤 = 𝑥 → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘𝑥 (abs‘𝐵))
1412, 13breq12d 3978 . . . . . 6 (𝑤 = 𝑥 → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))
1510, 14imbi12d 233 . . . . 5 (𝑤 = 𝑥 → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵))))
1615imbi2d 229 . . . 4 (𝑤 = 𝑥 → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))))
17 sseq1 3151 . . . . . 6 (𝑤 = (𝑥 ∪ {𝑦}) → (𝑤𝐴 ↔ (𝑥 ∪ {𝑦}) ⊆ 𝐴))
18 sumeq1 11245 . . . . . . . 8 (𝑤 = (𝑥 ∪ {𝑦}) → Σ𝑘𝑤 𝐵 = Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵)
1918fveq2d 5471 . . . . . . 7 (𝑤 = (𝑥 ∪ {𝑦}) → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵))
20 sumeq1 11245 . . . . . . 7 (𝑤 = (𝑥 ∪ {𝑦}) → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))
2119, 20breq12d 3978 . . . . . 6 (𝑤 = (𝑥 ∪ {𝑦}) → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
2217, 21imbi12d 233 . . . . 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 229 . . . 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 3151 . . . . . 6 (𝑤 = 𝐴 → (𝑤𝐴𝐴𝐴))
25 sumeq1 11245 . . . . . . . 8 (𝑤 = 𝐴 → Σ𝑘𝑤 𝐵 = Σ𝑘𝐴 𝐵)
2625fveq2d 5471 . . . . . . 7 (𝑤 = 𝐴 → (abs‘Σ𝑘𝑤 𝐵) = (abs‘Σ𝑘𝐴 𝐵))
27 sumeq1 11245 . . . . . . 7 (𝑤 = 𝐴 → Σ𝑘𝑤 (abs‘𝐵) = Σ𝑘𝐴 (abs‘𝐵))
2826, 27breq12d 3978 . . . . . 6 (𝑤 = 𝐴 → ((abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵) ↔ (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))
2924, 28imbi12d 233 . . . . 5 (𝑤 = 𝐴 → ((𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵)) ↔ (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))))
3029imbi2d 229 . . . 4 (𝑤 = 𝐴 → ((𝜑 → (𝑤𝐴 → (abs‘Σ𝑘𝑤 𝐵) ≤ Σ𝑘𝑤 (abs‘𝐵))) ↔ (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))))
31 0le0 8916 . . . . . 6 0 ≤ 0
32 sum0 11278 . . . . . . . 8 Σ𝑘 ∈ ∅ 𝐵 = 0
3332fveq2i 5470 . . . . . . 7 (abs‘Σ𝑘 ∈ ∅ 𝐵) = (abs‘0)
34 abs0 10951 . . . . . . 7 (abs‘0) = 0
3533, 34eqtri 2178 . . . . . 6 (abs‘Σ𝑘 ∈ ∅ 𝐵) = 0
36 sum0 11278 . . . . . 6 Σ𝑘 ∈ ∅ (abs‘𝐵) = 0
3731, 35, 363brtr4i 3994 . . . . 5 (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)
38372a1i 27 . . . 4 (𝜑 → (∅ ⊆ 𝐴 → (abs‘Σ𝑘 ∈ ∅ 𝐵) ≤ Σ𝑘 ∈ ∅ (abs‘𝐵)))
39 ssun1 3270 . . . . . . . . 9 𝑥 ⊆ (𝑥 ∪ {𝑦})
40 sstr 3136 . . . . . . . . 9 ((𝑥 ⊆ (𝑥 ∪ {𝑦}) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥𝐴)
4139, 40mpan 421 . . . . . . . 8 ((𝑥 ∪ {𝑦}) ⊆ 𝐴𝑥𝐴)
4241imim1i 60 . . . . . . 7 ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)))
43 simplrl 525 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥 ∈ Fin)
44 simpll 519 . . . . . . . . . . . . . . 15 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝜑)
45 simpr 109 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ⊆ 𝐴)
4645unssad 3284 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑥𝐴)
4746sselda 3128 . . . . . . . . . . . . . . 15 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → 𝑘𝐴)
48 fsumabs.2 . . . . . . . . . . . . . . 15 ((𝜑𝑘𝐴) → 𝐵 ∈ ℂ)
4944, 47, 48syl2an2r 585 . . . . . . . . . . . . . 14 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → 𝐵 ∈ ℂ)
5043, 49fsumcl 11290 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘𝑥 𝐵 ∈ ℂ)
5150abscld 11074 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘𝑥 𝐵) ∈ ℝ)
5249abscld 11074 . . . . . . . . . . . . 13 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘𝑥) → (abs‘𝐵) ∈ ℝ)
5343, 52fsumrecl 11291 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘𝑥 (abs‘𝐵) ∈ ℝ)
54 simpr 109 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ⊆ 𝐴)
5554unssbd 3285 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → {𝑦} ⊆ 𝐴)
56 vex 2715 . . . . . . . . . . . . . . . . 17 𝑦 ∈ V
5756snss 3685 . . . . . . . . . . . . . . . 16 (𝑦𝐴 ↔ {𝑦} ⊆ 𝐴)
5855, 57sylibr 133 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦𝐴)
5958adantlrl 474 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦𝐴)
6048ralrimiva 2530 . . . . . . . . . . . . . . 15 (𝜑 → ∀𝑘𝐴 𝐵 ∈ ℂ)
6160ad2antrr 480 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ∀𝑘𝐴 𝐵 ∈ ℂ)
62 nfcsb1v 3064 . . . . . . . . . . . . . . . 16 𝑘𝑦 / 𝑘𝐵
6362nfel1 2310 . . . . . . . . . . . . . . 15 𝑘𝑦 / 𝑘𝐵 ∈ ℂ
64 csbeq1a 3040 . . . . . . . . . . . . . . . 16 (𝑘 = 𝑦𝐵 = 𝑦 / 𝑘𝐵)
6564eleq1d 2226 . . . . . . . . . . . . . . 15 (𝑘 = 𝑦 → (𝐵 ∈ ℂ ↔ 𝑦 / 𝑘𝐵 ∈ ℂ))
6663, 65rspc 2810 . . . . . . . . . . . . . 14 (𝑦𝐴 → (∀𝑘𝐴 𝐵 ∈ ℂ → 𝑦 / 𝑘𝐵 ∈ ℂ))
6759, 61, 66sylc 62 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘𝐵 ∈ ℂ)
6867abscld 11074 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘𝑦 / 𝑘𝐵) ∈ ℝ)
6951, 53, 68leadd1d 8408 . . . . . . . . . . 11 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) ↔ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵))))
70 simplr 520 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ¬ 𝑦𝑥)
7170adantlrl 474 . . . . . . . . . . . . . . 15 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ¬ 𝑦𝑥)
72 disjsn 3621 . . . . . . . . . . . . . . 15 ((𝑥 ∩ {𝑦}) = ∅ ↔ ¬ 𝑦𝑥)
7371, 72sylibr 133 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∩ {𝑦}) = ∅)
74 eqidd 2158 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) = (𝑥 ∪ {𝑦}))
7556a1i 9 . . . . . . . . . . . . . . 15 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 ∈ V)
76 unsnfi 6860 . . . . . . . . . . . . . . 15 ((𝑥 ∈ Fin ∧ 𝑦 ∈ V ∧ ¬ 𝑦𝑥) → (𝑥 ∪ {𝑦}) ∈ Fin)
7743, 75, 71, 76syl3anc 1220 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∪ {𝑦}) ∈ Fin)
7845sselda 3128 . . . . . . . . . . . . . . . . 17 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → 𝑘𝐴)
7944, 78, 48syl2an2r 585 . . . . . . . . . . . . . . . 16 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → 𝐵 ∈ ℂ)
8079abscld 11074 . . . . . . . . . . . . . . 15 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → (abs‘𝐵) ∈ ℝ)
8180recnd 7900 . . . . . . . . . . . . . 14 ((((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) ∧ 𝑘 ∈ (𝑥 ∪ {𝑦})) → (abs‘𝐵) ∈ ℂ)
8273, 74, 77, 81fsumsplit 11297 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) = (Σ𝑘𝑥 (abs‘𝐵) + Σ𝑘 ∈ {𝑦} (abs‘𝐵)))
83 csbfv2g 5504 . . . . . . . . . . . . . . . . . . 19 (𝑦 ∈ V → 𝑦 / 𝑘(abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵))
8483elv 2716 . . . . . . . . . . . . . . . . . 18 𝑦 / 𝑘(abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵)
8560ad2antrr 480 . . . . . . . . . . . . . . . . . . . . 21 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ∀𝑘𝐴 𝐵 ∈ ℂ)
8658, 85, 66sylc 62 . . . . . . . . . . . . . . . . . . . 20 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘𝐵 ∈ ℂ)
8786abscld 11074 . . . . . . . . . . . . . . . . . . 19 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘𝑦 / 𝑘𝐵) ∈ ℝ)
8887recnd 7900 . . . . . . . . . . . . . . . . . 18 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘𝑦 / 𝑘𝐵) ∈ ℂ)
8984, 88eqeltrid 2244 . . . . . . . . . . . . . . . . 17 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘(abs‘𝐵) ∈ ℂ)
90 sumsns 11305 . . . . . . . . . . . . . . . . 17 ((𝑦 ∈ V ∧ 𝑦 / 𝑘(abs‘𝐵) ∈ ℂ) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = 𝑦 / 𝑘(abs‘𝐵))
9156, 89, 90sylancr 411 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = 𝑦 / 𝑘(abs‘𝐵))
9291, 84eqtrdi 2206 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦} (abs‘𝐵) = (abs‘𝑦 / 𝑘𝐵))
9392oveq2d 5837 . . . . . . . . . . . . . 14 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 (abs‘𝐵) + Σ𝑘 ∈ {𝑦} (abs‘𝐵)) = (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵)))
9493adantlrl 474 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 (abs‘𝐵) + Σ𝑘 ∈ {𝑦} (abs‘𝐵)) = (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵)))
9582, 94eqtrd 2190 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) = (Σ𝑘𝑥 (abs‘𝐵) + (abs‘𝑦 / 𝑘𝐵)))
9695breq2d 3977 . . . . . . . . . . 11 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 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))))
9769, 96bitr4d 190 . . . . . . . . . 10 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) ↔ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
9870, 72sylibr 133 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∩ {𝑦}) = ∅)
9998adantlrl 474 . . . . . . . . . . . . . . 15 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (𝑥 ∩ {𝑦}) = ∅)
10099, 74, 77, 79fsumsplit 11297 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 = (Σ𝑘𝑥 𝐵 + Σ𝑘 ∈ {𝑦}𝐵))
101 sumsns 11305 . . . . . . . . . . . . . . . . 17 ((𝑦𝐴𝑦 / 𝑘𝐵 ∈ ℂ) → Σ𝑘 ∈ {𝑦}𝐵 = 𝑦 / 𝑘𝐵)
10258, 86, 101syl2anc 409 . . . . . . . . . . . . . . . 16 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ {𝑦}𝐵 = 𝑦 / 𝑘𝐵)
103102oveq2d 5837 . . . . . . . . . . . . . . 15 (((𝜑 ∧ ¬ 𝑦𝑥) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 𝐵 + Σ𝑘 ∈ {𝑦}𝐵) = (Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵))
104103adantlrl 474 . . . . . . . . . . . . . 14 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (Σ𝑘𝑥 𝐵 + Σ𝑘 ∈ {𝑦}𝐵) = (Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵))
105100, 104eqtrd 2190 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 = (Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵))
106105fveq2d 5471 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) = (abs‘(Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵)))
10786adantlrl 474 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → 𝑦 / 𝑘𝐵 ∈ ℂ)
10850, 107abstrid 11089 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘(Σ𝑘𝑥 𝐵 + 𝑦 / 𝑘𝐵)) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)))
109106, 108eqbrtrd 3986 . . . . . . . . . . 11 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)))
11077, 79fsumcl 11290 . . . . . . . . . . . . 13 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵 ∈ ℂ)
111110abscld 11074 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ∈ ℝ)
11251, 68readdcld 7901 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) + (abs‘𝑦 / 𝑘𝐵)) ∈ ℝ)
11377, 80fsumrecl 11291 . . . . . . . . . . . 12 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵) ∈ ℝ)
114 letr 7954 . . . . . . . . . . . 12 (((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)))
115111, 112, 113, 114syl3anc 1220 . . . . . . . . . . 11 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 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)))
116109, 115mpand 426 . . . . . . . . . 10 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 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)))
11797, 116sylbid 149 . . . . . . . . 9 (((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) ∧ (𝑥 ∪ {𝑦}) ⊆ 𝐴) → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))
118117ex 114 . . . . . . . 8 ((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → ((abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵) → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
119118a2d 26 . . . . . . 7 ((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) → (((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
12042, 119syl5 32 . . . . . 6 ((𝜑 ∧ (𝑥 ∈ Fin ∧ ¬ 𝑦𝑥)) → ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵))))
121120expcom 115 . . . . 5 ((𝑥 ∈ Fin ∧ ¬ 𝑦𝑥) → (𝜑 → ((𝑥𝐴 → (abs‘Σ𝑘𝑥 𝐵) ≤ Σ𝑘𝑥 (abs‘𝐵)) → ((𝑥 ∪ {𝑦}) ⊆ 𝐴 → (abs‘Σ𝑘 ∈ (𝑥 ∪ {𝑦})𝐵) ≤ Σ𝑘 ∈ (𝑥 ∪ {𝑦})(abs‘𝐵)))))
122121a2d 26 . . . 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)))))
1239, 16, 23, 30, 38, 122findcard2s 6832 . . 3 (𝐴 ∈ Fin → (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))))
1242, 123mpcom 36 . 2 (𝜑 → (𝐴𝐴 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵)))
1251, 124mpi 15 1 (𝜑 → (abs‘Σ𝑘𝐴 𝐵) ≤ Σ𝑘𝐴 (abs‘𝐵))
 Colors of variables: wff set class Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 103   = wceq 1335   ∈ wcel 2128  ∀wral 2435  Vcvv 2712  ⦋csb 3031   ∪ cun 3100   ∩ cin 3101   ⊆ wss 3102  ∅c0 3394  {csn 3560   class class class wbr 3965  ‘cfv 5169  (class class class)co 5821  Fincfn 6682  ℂcc 7724  ℝcr 7725  0cc0 7726   + caddc 7729   ≤ cle 7907  abscabs 10890  Σcsu 11243 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 105  ax-ia2 106  ax-ia3 107  ax-in1 604  ax-in2 605  ax-io 699  ax-5 1427  ax-7 1428  ax-gen 1429  ax-ie1 1473  ax-ie2 1474  ax-8 1484  ax-10 1485  ax-11 1486  ax-i12 1487  ax-bndl 1489  ax-4 1490  ax-17 1506  ax-i9 1510  ax-ial 1514  ax-i5r 1515  ax-13 2130  ax-14 2131  ax-ext 2139  ax-coll 4079  ax-sep 4082  ax-nul 4090  ax-pow 4135  ax-pr 4169  ax-un 4393  ax-setind 4495  ax-iinf 4546  ax-cnex 7817  ax-resscn 7818  ax-1cn 7819  ax-1re 7820  ax-icn 7821  ax-addcl 7822  ax-addrcl 7823  ax-mulcl 7824  ax-mulrcl 7825  ax-addcom 7826  ax-mulcom 7827  ax-addass 7828  ax-mulass 7829  ax-distr 7830  ax-i2m1 7831  ax-0lt1 7832  ax-1rid 7833  ax-0id 7834  ax-rnegex 7835  ax-precex 7836  ax-cnre 7837  ax-pre-ltirr 7838  ax-pre-ltwlin 7839  ax-pre-lttrn 7840  ax-pre-apti 7841  ax-pre-ltadd 7842  ax-pre-mulgt0 7843  ax-pre-mulext 7844  ax-arch 7845  ax-caucvg 7846 This theorem depends on definitions:  df-bi 116  df-dc 821  df-3or 964  df-3an 965  df-tru 1338  df-fal 1341  df-nf 1441  df-sb 1743  df-eu 2009  df-mo 2010  df-clab 2144  df-cleq 2150  df-clel 2153  df-nfc 2288  df-ne 2328  df-nel 2423  df-ral 2440  df-rex 2441  df-reu 2442  df-rmo 2443  df-rab 2444  df-v 2714  df-sbc 2938  df-csb 3032  df-dif 3104  df-un 3106  df-in 3108  df-ss 3115  df-nul 3395  df-if 3506  df-pw 3545  df-sn 3566  df-pr 3567  df-op 3569  df-uni 3773  df-int 3808  df-iun 3851  df-br 3966  df-opab 4026  df-mpt 4027  df-tr 4063  df-id 4253  df-po 4256  df-iso 4257  df-iord 4326  df-on 4328  df-ilim 4329  df-suc 4331  df-iom 4549  df-xp 4591  df-rel 4592  df-cnv 4593  df-co 4594  df-dm 4595  df-rn 4596  df-res 4597  df-ima 4598  df-iota 5134  df-fun 5171  df-fn 5172  df-f 5173  df-f1 5174  df-fo 5175  df-f1o 5176  df-fv 5177  df-isom 5178  df-riota 5777  df-ov 5824  df-oprab 5825  df-mpo 5826  df-1st 6085  df-2nd 6086  df-recs 6249  df-irdg 6314  df-frec 6335  df-1o 6360  df-oadd 6364  df-er 6477  df-en 6683  df-dom 6684  df-fin 6685  df-pnf 7908  df-mnf 7909  df-xr 7910  df-ltxr 7911  df-le 7912  df-sub 8042  df-neg 8043  df-reap 8444  df-ap 8451  df-div 8540  df-inn 8828  df-2 8886  df-3 8887  df-4 8888  df-n0 9085  df-z 9162  df-uz 9434  df-q 9522  df-rp 9554  df-fz 9906  df-fzo 10035  df-seqfrec 10338  df-exp 10412  df-ihash 10643  df-cj 10735  df-re 10736  df-im 10737  df-rsqrt 10891  df-abs 10892  df-clim 11169  df-sumdc 11244 This theorem is referenced by:  iserabs  11365  cvgratnnlemabsle  11417  mertenslemi1  11425
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