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+12
-19
@@ -1,8 +1,8 @@
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# -*- org-export-switch: "todoes"; -*-
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# -*- org-export-switch: "xens mp"; -*-
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#+title: Exercices 2023
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#+author: Sébastien Miquel
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#+date: 02-12-2023
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# Time-stamp: <30-11-24 16:51>
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# Time-stamp: <09-06-26 20:33>
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#+OPTIONS:
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@@ -162,10 +162,10 @@ python3 -c "import torch; print(f'device name [0]:', torch.cuda.get_device_name(
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*** XENS MP
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# #+select_tags: xens
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# #+exclude_tags: autre
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# #+export_file_name: Exercices XENS MP 2023
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#+select_tags: xens
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#+exclude_tags: autre
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#+export_file_name: Exercices XENS MP 2023
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#+options: toc:t
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*** Centrale
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# #+select_tags: cent
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@@ -185,10 +185,10 @@ python3 -c "import torch; print(f'device name [0]:', torch.cuda.get_device_name(
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*** todoes
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#+options: title:nil nopage:t tags:nil
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#+select_tags: todo
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#+export_file_name: Exercices 2023 todo
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#+relocate_tags: todo
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# #+options: title:nil nopage:t tags:nil
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# #+select_tags: todo
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# #+export_file_name: Exercices 2023 todo
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# #+relocate_tags: todo
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*** autre
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@@ -198,11 +198,6 @@ python3 -c "import torch; print(f'device name [0]:', torch.cuda.get_device_name(
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# #+relocate_tags: todo
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* 2024
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#+INCLUDE: "./2024/Exercices 2024.org::*Christophe"
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* ENS MP-MPI :xens:
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** Algèbre
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@@ -1320,7 +1315,7 @@ Soit $q\in\N^*$. Déterminer la limite de $(\frac{1}{n}\op{tr}\left(A_n^q\right)
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#+BEGIN_proof
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Pour $q$ impair la trace est nulle.
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Pour $q$ pair, en interprétant comme un graphe, on obtient quelque chose proche de somme de Riemann, et on tend vers ${q \choose q/2}\int_0^1 f(x)^q \dx$.
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Pour $q$ pair, en interprétant comme un graphe, on obtient quelque chose proche de sommes de Riemann, et on tend vers ${q \choose q/2}\int_0^1 f(x)^q \dx$.
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#+END_proof
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@@ -8707,9 +8702,7 @@ Sa somme est notée $S(x,y)$.
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#+end_exercice
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#+begin_exercice [Centrale 2023 # 1277]
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On melange les cartes d'un jeu de $2n$ cartes.
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Avec quelle probabilité les cartes de numéro impair sont-elles correctement ordonnées?
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On mélange les cartes d'un jeu de $2n$ cartes. Avec quelle probabilité les cartes de numéro impair sont-elles correctement ordonnées ?
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#+end_exercice
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#+begin_exercice [Centrale 2023 # 1278]
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