device-127.home 2026-2-11:23:47:27
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3
.obsidian/appearance.json
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3
.obsidian/appearance.json
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"general_interface",
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"general_interface",
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"omts-[editor] Compact Right Sidebar notes",
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"omts-[editor] Compact Right Sidebar notes",
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"checkboxes",
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"checkboxes",
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"headers"
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"headers",
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"dark_pdf"
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],
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],
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"interfaceFontFamily": "CMU Bright,CMU Serif,FiraCode Nerd Font",
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"interfaceFontFamily": "CMU Bright,CMU Serif,FiraCode Nerd Font",
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"textFontFamily": "CMU Sans Serif,CMU Serif,FiraCode Nerd Font",
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"textFontFamily": "CMU Sans Serif,CMU Serif,FiraCode Nerd Font",
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/* markmind pdf reader (and annotator) */
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/* markmind pdf reader (and annotator) */
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.theme-dark .pdf-viewer {
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/* .theme-dark*/
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.pdfViewer {
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filter: invert(0.7)
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filter: invert(0.7)
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brightness(0.85)
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brightness(0.85)
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contrast(1.6)
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contrast(1.6)
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@@ -4,3 +4,12 @@ tags:
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aliases:
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aliases:
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---
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---
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> [!definition] [[ensemble récursif primitif]]
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> Un ensemble est dit **récursif primitif** si sa [[fonction caractéristique d'un ensemble]]
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^definition
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# Propriétés
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# Exemples
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16
fonction caractéristique d'un ensemble.md
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16
fonction caractéristique d'un ensemble.md
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---
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up:
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tags:
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aliases:
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---
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> [!definition] [[fonction caractéristique d'un ensemble]]
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> Soit $E$ un ensemble,
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> La fonction caractéristique de cet ensemble, notée $\mathbb{1}_{E}$, ou $\mathbf{1}_{E}$ ou encore $\chi_{E}$ est la fonction qui vaut $1$ partout sur $E$, et $0$ partout ailleurs :
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> $\mathbb{1}_{E} : \begin{cases} \mathbb{1}_{E}(x) = 1 \qquad \text{si } x \in E\\ \mathbb{1}_{E}(x) = 0 \qquad \text{si } x \notin E \end{cases}$
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^definition
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# Propriétés
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# Exemples
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