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        <title>start - [Bienvenue sur le site de l&#039;ISRI] </title>
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        <description>Bienvenue sur le site de l&#039;ISRI

L&#039;ISRI est un collectif de scientifiques fondé en 1982 par André Gsponer qui fut à la fois physicien et chercheur pour la paix. L&#039;ISRI est né des préoccupations à propos des applications militaires de la science. Il a ensuite développé son activité dans le thème général de la maîtrise de la science au service de la démocratie et de la paix.$\Longrightarrow$</description>
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ISRI-2026-01G. Falquet, S. AljalboutUnderstanding Wikidata Qualifiers: An Analysis and Taxonomy  arxivISRI-2025-01J.-P. Hurni La reconversion du CERN : Pourquoi et comment ?  Une contribution aux discussions sur l’avenir du CERN suscitées par le projet FCC</description>
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        <title>definitions - [Remarque cruciale] </title>
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        <description>Formulaire

Quaternions

Structures algébriques

Quaternions

Un quaternion est un élément du corps non commutatif $\mathbb{H}$ qui est l&#039;extension des réels engendrée par les unités $e_{1},e_{2},e_{3}$ telles que ${e_1}^{2}={e_2}^{2}={e_3}^{2}=e_{1}e_{2}e_{3}=-1$.

Un quaternion $Q$ peut s&#039;écrire sous la forme $q_{0}+q_{1}e_{1}+q_{2}e_{2}+q_{3}e_{3}$ où les $q_{i}$ sont des réels.$P$$p_{0},p_{1},p_{2},p_{3}$$Q = q_{0}+q_{1}e_{1}+q_{2}e_{2}+q_{3}e_{3}$$\mathbb{S}(Q)$$q_0$$Q = q_{0}+q_{1}e_{1}+q_…</description>
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        <title>colloques - [11e Colloque André Gsponer] </title>
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        <description>Colloques André Gsponer

Les Colloques en souvenir d’André Gsponer (physicien et pacifiste, 1948–2009) sont organisés le plus généralement chez Mireille Calame, dépositaire selon « un provisoire qui dure » des archives d’André Gsponer. Ces colloques sont organisés sous la responsabilité informelle des Gsponériens, des chercheurs qui ont collaboré directement ou indirectement avec André et sont donc les « héritiers » des principaux programmes de recherches commencés et conduits par André : Gilles…</description>
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        <description>Formulaire quaternionique

Ce formulaire est organisé en fonction de l&#039;usage des quaternions pour traiter divers objets mathématiques (équations de degré 1, 2 ou n, fonctions, matrices, groupe). Chaque chapitre comprend un formulaire suivi de preuves ou commentaires. Les preuves sont données à titre d&#039;exemple de manipulations quaternioniques.</description>
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        <title>pmf</title>
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        <description>Physique mathématique fondamentale

$\textit{Page incomplète - Réorganisation en cours}$

$%J.-P. Hurni, G. Falquet. **Formulaire quaternionique** Hypertexte évolutif. ISRI 2025 [[quaternions|ISRI-2025-01]]$

A. Gsponer. The sequence of ideas in a re-discovery of the Colombeau algebras (July 2008) 28 pp.	ISRI-08-01 - arXiv

A. Gsponer.	A concise introduction to Colombeau generalized functions and their applications in classical electrodynamics	Eur. J. Phys. 30 (2009) 109–126.</description>
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