Ivan Shishkin, Rye (1878)

Problems/Real analysisUnreviewedEdited since review

Des sommes irrationnellement contrôlables.

by Dattier·
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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Unreviewed. This problem changed after its last review and should be reviewed again.

Soit (un)(u_n) une suite réelle vérifiant : ∀n∈N,∣un∣⩽1\forall n \in \mathbb N, |u_n|\leqslant 1.
A-t-on ∃x∈[1,2]∩(R∖Q),∀n∈N,∣∑k=110nuk−uE(x10n)∣⩽10n−1\exists x \in [1,2]\cap (\mathbb R \setminus \mathbb Q), \forall n \in \mathbb N, \left|\sum \limits_{k=1}^{10^n} u_k -u_{E(x10^n)}\right|\leqslant 10^n-1 ?
Remarque : EE est la fonction partie entière.

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References

  1. exclus Maths Woods des dattes à Dattier
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