Geodesic
Biliardi matematici, caos e ciambelle “infinite”: perché i matematici “giocano” a biliardo, dai poligoni al modellodi Ehrenfest
Matematica, cultura e società, Série 1, Tome 3 (2018) no. 1, pp. 13-30 Cet article a éte moissonné depuis la source Biblioteca Digitale Italiana di Matematica

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Mathematical billiards are an idealization of the game of pool. Many systems in physics, for example in mechanics or thermodynamics, can be described by mathematical billiards. Billiards provide also a mathematical model of chaotic behaviour, which may display several different chaotic features. How much chaotic a billiard is, depends mostly on the shape of the billiard table. In this introductory article on billiards we will focus especially on the behaviour of trajectories in a class of polygonal billiards (rational ones), both bounded and infinite (such as the well known Ehrenfest model). We will try to convey some of the mathematical tools which were used to study chaotic features, such as unfolding and renormalization. 
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     author = {Ulcigrai, Corinna},
     title = {Biliardi matematici, caos e ciambelle {\textquotedblleft}infinite{\textquotedblright}: perch\'e i matematici {\textquotedblleft}giocano{\textquotedblright} a biliardo, dai poligoni al modellodi {Ehrenfest}},
     journal = {Matematica, cultura e societ\`a},
     pages = {13--30},
     year = {2018},
     volume = {Ser. 1, 3},
     number = {1},
     zbl = {1397.37041},
     mrnumber = {3821680},
     language = {it},
     url = {http://geodesic.mathdoc.fr/item/RUMI_2018_1_3_1_a2/}
}
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Ulcigrai, Corinna. Biliardi matematici, caos e ciambelle “infinite”: perché i matematici “giocano” a biliardo, dai poligoni al modellodi Ehrenfest. Matematica, cultura e società, Série 1, Tome 3 (2018) no. 1, pp. 13-30. http://geodesic.mathdoc.fr/item/RUMI_2018_1_3_1_a2/