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https://github.com/BreizhHardware/cours-ISEN-MD.git
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Obisidian vault auto-backup: 30-11-2024 15:07:28 on constellation. 5 files edited
This commit is contained in:
4
.obsidian/daily-notes.json
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4
.obsidian/daily-notes.json
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@@ -1,6 +1,6 @@
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{
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"format": "DD/MM/YYYY",
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"format": "DD-MM-YYYY",
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"folder": "ISEN/Daily",
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"template": "ISEN/Template/Daily {{date}}",
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"template": "ISEN/Template/Daily-{{date}}",
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"autorun": true
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}
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25
.obsidian/workspace.json
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25
.obsidian/workspace.json
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@@ -8,18 +8,18 @@
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"type": "tabs",
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"children": [
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{
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"id": "da4017e2068b8f8f",
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"id": "b2c40bfed82443e8",
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"type": "leaf",
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"state": {
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"type": "markdown",
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"state": {
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"file": "ISEN/Maths/CIPA3/DM1.md",
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"file": "ISEN/Maths/CIPA3/Fiche de révision DS1.md",
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"mode": "source",
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"backlinks": true,
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"source": false
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},
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"icon": "lucide-file",
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"title": "DM1"
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"title": "Fiche de révision DS1"
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}
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},
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{
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@@ -43,17 +43,16 @@
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"state": {
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"type": "markdown",
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"state": {
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"file": "ISEN/Daily/30/11/2024.md",
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"file": "ISEN/Daily/30-11-2024.md",
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"mode": "source",
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"backlinks": true,
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"source": false
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},
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"icon": "lucide-file",
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"title": "2024"
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"title": "30-11-2024"
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}
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}
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"direction": "vertical"
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@@ -171,10 +170,10 @@
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"state": {
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"type": "outline",
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"state": {
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"file": "ISEN/Daily/30/11/2024.md"
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"file": "ISEN/Maths/CIPA3/Fiche de révision DS1.md"
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},
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"icon": "lucide-list",
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"title": "Plan de 2024"
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"title": "Plan de Fiche de révision DS1"
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}
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},
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{
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@@ -220,9 +219,11 @@
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"obsidian-git:Open Git source control": false
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}
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},
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"active": "d12031bc1c58d500",
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"active": "b2c40bfed82443e8",
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"ISEN/Template/Daily {{date}}.md",
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"ISEN/Daily/30-11-2024.md",
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"ISEN/Maths/CIPA3/Fiche de révision DS1.md",
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"ISEN/Template/Daily-{{date}}.md",
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"ISEN/Daily/30/11/2024.md",
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"ISEN/Daily/30/11",
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"ISEN/Daily/30",
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@@ -259,8 +260,6 @@
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"ISEN/Algo C/CIPA3/TP2_C.pdf",
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"ISEN/Algo C/CIPA3/Code Ex01.c",
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"ISEN/Réunion/CIPA 3/Départ en entreprise 1 20-09-2024.md",
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"ISEN/FHS/A2/Film/Schéma naratif.md",
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"ISEN/FHS/A2/Outils RH/Outils RH 2024-02-09.md",
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"ISEN/Modelec/NB point.canvas",
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"ISEN/Réseau/A2/TP Ansible et docker.canvas",
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"Untitled.canvas",
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43
ISEN/Maths/CIPA3/Fiche de révision DS1.md
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43
ISEN/Maths/CIPA3/Fiche de révision DS1.md
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@@ -0,0 +1,43 @@
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# 1. **Espaces de Hilbert**
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Un **espace de Hilbert** est un espace vectoriel normé complet muni d'un produit scalaire.
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## Définitions
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- **Produit scalaire** :
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$$
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\langle u, v \rangle = \sum_{i=1}^n u_i \overline{v_i} \quad \text{(ou une intégrale si l'espace est infini-dimensionnel)}.
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$$
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- **Norme induite** :
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$$
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`\|u\| = \sqrt{\langle u, u \rangle}.`
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$$
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## Propriétés
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1. **Orthogonalité** : Deux vecteurs uuu et vvv sont orthogonaux si :
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$$
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\langle u, v \rangle = 0
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$$
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2. **Inégalité de Cauchy-Schwarz** :
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$$
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|\langle u, v \rangle| \leq \|u\| \|v\|.
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$$
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3. **Théorème de projection orthogonale** :
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Si $H$ est un sous-espace fermé, tout vecteur $x$ se décompose en :
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$$
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x = x_H + x_H^\perp, \quad x_H \in H, \, x_H^\perp \in H^\perp.
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$$
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# 2. **Décomposition en Séries de Fourier**
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## Définition
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Une fonction périodique $f(x)$ de période $2π$ peut être décomposée en une série de Fourier :
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$$
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f(x) = a_0 + \sum_{n=1}^\infty \left[a_n \cos(nx) + b_n \sin(nx)\right].
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$$
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## Coefficients de Fourier
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- $a_0$ :
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$$a_0 = \frac{1}{2\pi} \int_{-\pi}^\pi f(x) \, dx$$
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- $a_n$ :
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$$a_n = \frac{1}{\pi} \int_{-\pi}^\pi f(x) \cos(nx) \, dx$$
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- $b_n$ :
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$$b_n = \frac{1}{\pi} \int_{-\pi}^\pi f(x) \sin(nx) \, dx$$
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## Propriétés
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-
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