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| - Friedrich Risner (1533 - 15 de setembre 1580) va ser un matemàtic alemany de (actualment Bad Hersfeld), Hessen que va suggerir la idea d'una càmera obscura portable. Va ser col·laborador de l'humanista francès Petrus Ramus i va treballar com a professor al Departament de Matemàtiques al Collège Royale de France a París. Friedrich Risner va utilitzar la càmera obscura per realitzar experiments d'òptica i, generalment, es considera un dels precursors de la càmera moderna. (ca)
- Friedrich Risner (* um 1533 in Hersfeld; † 15. September 1580 ebenda) war ein Mathematiker. (de)
- Friedrich Risner ou Frédéric Riesner, né à Bad Hersfeld en Allemagne, mort vers 1580 à Hersfeld, est un mathématicien et physicien d'origine allemande. (fr)
- Friedrich Risner (Bad Hersfeld, 1533 – Bad Hersfeld, 15 settembre 1580) è stato un matematico e ottico tedesco. Fu assistente di Petrus Ramus (dal 1565 circa) e fu il primo presidente di matematica al Collège Royale de France (1576). Risner è noto per la sua pubblicazione nel 1572 di Opticae thesaurus: Alhazeni Arabis libri septem, nuncprimum editi; Eiusdem liber De Crepusculis et nubium ascensionibus, Item Vitellonis Thuringopoloni libri X. La pubblicazione divenne un importante vantaggio per un certo numero di matematici e scienziati, come Keplero, Snellius, Cartesio e Huygens. (it)
- Friedrich Risner (Bad Hersfeld, ca. 1533 — Bad Hersfeld, 15 de setembro de 1580) foi um matemático alemão. Discípulo de Petrus Ramus (1515-1572), primeiro catedrático de matemática do Collège de France. (pt)
- Friedrich Risner (c.1533 – 15 September 1580) (in Latin Fridericus Risnerus) was a German mathematician from Hersfeld, Hesse. He was an assistant to Petrus Ramus (from around 1565) and was the first chair of mathematics at Collège Royale de France (1576). He was the first to propose the idea of a portable camera obscura, which purportedly was to be used as an aid in the creation of artistic works. His idea consisted of a lightweight wooden hut that had small holes fitted with lenses in each wall, and a cube of paper placed in the centre for drawing. (en)
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| has abstract
| - Friedrich Risner (1533 - 15 de setembre 1580) va ser un matemàtic alemany de (actualment Bad Hersfeld), Hessen que va suggerir la idea d'una càmera obscura portable. Va ser col·laborador de l'humanista francès Petrus Ramus i va treballar com a professor al Departament de Matemàtiques al Collège Royale de France a París. Friedrich Risner va utilitzar la càmera obscura per realitzar experiments d'òptica i, generalment, es considera un dels precursors de la càmera moderna. (ca)
- Friedrich Risner (* um 1533 in Hersfeld; † 15. September 1580 ebenda) war ein Mathematiker. (de)
- Friedrich Risner (c.1533 – 15 September 1580) (in Latin Fridericus Risnerus) was a German mathematician from Hersfeld, Hesse. He was an assistant to Petrus Ramus (from around 1565) and was the first chair of mathematics at Collège Royale de France (1576). Risner is known for his 1572 publication of "Opticae thesaurus: Alhazeni Arabis libri septem, nuncprimum editi; Eiusdem liber De Crepusculis et nubium ascensionibus, Item Vitellonis Thuringopoloni libri X" (Optical Treasure: Seven books of Alhazen the Arab, published for the first time; His book On Twilight and the Rising of Clouds, Also of Vitello Thuringopoloni book X), an edition of works by Ibn al-Haitham (Alhazen) and Erazmus Ciołek Witelo (Vitello), two men who were both early pioneers in the field of optics. The publication became a major benefit to a number of mathematicians and scientists, such as Kepler, Snellius, Descartes and Huygens He was the first to propose the idea of a portable camera obscura, which purportedly was to be used as an aid in the creation of artistic works. His idea consisted of a lightweight wooden hut that had small holes fitted with lenses in each wall, and a cube of paper placed in the centre for drawing. After St. Bartholomew's Day massacre, Risner fled back to Hersfeld and died there eight years later. Risner was buried in Hersfeld Abbey, where his gravestone is well preserved. The Latin circumscription on the gravestone is: "Anno Domini 1580. 17. Cal. Octob. pie in Christo obiit clariss. vir Fridericus Risner insignis et praestantissimus Mathematicus qui hic terrae mandatus sonitum tubae expectat aetatis suae 47." English translation of the inscription above is: "In year 1580 at 15th of September, died in Christ at the age of 47, the well famous Friedrich Risner, an outstanding, excellent mathematician, who passed to soil here, will expect the sound of trumpet." (en)
- Friedrich Risner ou Frédéric Riesner, né à Bad Hersfeld en Allemagne, mort vers 1580 à Hersfeld, est un mathématicien et physicien d'origine allemande. (fr)
- Friedrich Risner (Bad Hersfeld, 1533 – Bad Hersfeld, 15 settembre 1580) è stato un matematico e ottico tedesco. Fu assistente di Petrus Ramus (dal 1565 circa) e fu il primo presidente di matematica al Collège Royale de France (1576). Risner è noto per la sua pubblicazione nel 1572 di Opticae thesaurus: Alhazeni Arabis libri septem, nuncprimum editi; Eiusdem liber De Crepusculis et nubium ascensionibus, Item Vitellonis Thuringopoloni libri X. La pubblicazione divenne un importante vantaggio per un certo numero di matematici e scienziati, come Keplero, Snellius, Cartesio e Huygens. (it)
- Friedrich Risner (Bad Hersfeld, ca. 1533 — Bad Hersfeld, 15 de setembro de 1580) foi um matemático alemão. Discípulo de Petrus Ramus (1515-1572), primeiro catedrático de matemática do Collège de France. (pt)
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