tangències

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• Problem of Apollonius — In Euclidean plane geometry, Apollonius problem is to construct circles that are tangent to three given circles in a plane (Figure 1); two circles are tangent if they touch at a single point. Apollonius of Perga (ca. 262 BC ndash; ca. 190 BC)… …   Wikipedia

• Steiner chain — In geometry, a Steiner chain is a set of n circles, all of which are tangent to two given non intersecting circles (blue and red in Figure 1), where n is finite and each circle in the chain is tangent to the previous and next circles in the chain …   Wikipedia

• Malfatti circles — In geometry, the Malfatti circles are three circles inside a given triangle such that each circle is tangent to the other two and to two sides of the triangle. They are named after Gian Francesco Malfatti, who made early studies of the problem of …   Wikipedia

• Jacob Palis — Jacob Palis, Jr. (b. 15 March 1940 in Uberaba, Brazil) is a Brazilian mathematician of international recognition. Since 1973 he has held a permanent position as professor at Instituto Nacional de Matemática Pura e Aplicada in Rio de Janeiro,… …   Wikipedia

• Circle packing theorem — Example of the circle packing theorem on K5, the complete graph on five vertices, minus one edge. The circle packing theorem (also known as the Koebe–Andreev–Thurston theorem) describes the possible tangency relations between circles in the plane …   Wikipedia

• Marin Ghetaldi — Marino Ghetaldi Marino Ghetaldi dans le palais du recteur de Raguse Naissance 2 octobre 1568 Raguse (République de Raguse) Décès 11 avril 1626 Raguse (République de Raguse) …   Wikipédia en Français

• mathematics — /math euh mat iks/, n. 1. (used with a sing. v.) the systematic treatment of magnitude, relationships between figures and forms, and relations between quantities expressed symbolically. 2. (used with a sing. or pl. v.) mathematical procedures,… …   Universalium

• Apollonius of Perga — born с 240 BC, Perga, Anatolia died с 190 BC, Alexandria, Egypt Mathematician known as The Great Geometer. His Conics was one of the greatest scientific treatises of the ancient world. In it he introduced the terms parabola, ellipse, and… …   Universalium

• Jacob Palis — Nacimiento 15 de Marzo de 1940 Uberaba, Brasil Nacionalidad Campo …   Wikipedia Español

• Jacob Palis — Jacob Palis, Jr. (* 15. März 1940 in Uberaba, Minas Gerais) ist ein brasilianischer Mathematiker und Hochschullehrer. Inhaltsverzeichnis 1 Biografie 2 Veröffentlichungen 2.1 Fachaufsätze …   Deutsch Wikipedia

• Democritus — Full name Democritus Born ca. 460 BC Abdera, Thrace Died ca. 370 BC (Aged 90) Era …   Wikipedia