Ivan Shishkin, Rye (1878)

Problems/Real analysisUnreviewed

Mieux vaut tard que jamais pour mesurer les intervalles.

by budleya·
50
Difficulty scaleÉchelle de difficulté

This score reflects both the level of the required concepts and the difficulty of the solution.Ce score tient compte à la fois du niveau des notions nécessaires et de la difficulté de la résolution.

  1. 1–10First steps / middle schoolPremiers pas / collège
  2. 11–25Beginner / high schoolDébutant / lycée
  3. 26–50Intermediate / undergraduateIntermédiaire / licence
  4. 51–70Advanced / graduateAvancé / master
  5. 71–90Expert / specializedExpert / spécialisé
  6. 91–100Research levelNiveau recherche
These levels are approximate guides.Ces niveaux sont des repères approximatifs.
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Soit
f(x)=∑k=180kx−kf(x)=\sum_{k=1}^{80}{k\over x-k}et E={x∈R / f(x)>8/5}E=\{ x\in\R\ /\ f(x)>8/5 \}.
Montrer que EE est une réunion disjointe d’intervalles ouverts dont on calculera la somme des longueurs.

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