Ivan Shishkin, Rye (1878)

Problems/Measure theoryExerciseUnreviewed

Tribu des parties

by Ancient Tree·
35
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 XX un ensemble.
Montrer que l’ensemble P(X)\mathcal{P}(X) des parties de XX est une tribu sur XX.

Note : cette tribu s’appelle parfois la tribu discrète.

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