Geodesic
Minima a maxima Pierra de Fermat (k 350 letům od matematikovy smrti)
Rozhledy matematicko-fyzikální, Tome 89 (2014) no. 3, pp. 18-25.

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The article deals with several mathematical problems on finding local maxima or minima by a French lawyer and mathematician Pierre de Fermat. Fermat’s original solving methods without the use of differential calculus are described. Fermat’s contribution to physics (Fermat’s principle of least time) is briefly mentioned. The article also presents Fermat’s biographical data. 
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     author = {J\'achim, Franti\v{s}ek},
     title = {Minima a maxima {Pierra} de {Fermat} (k 350 let\r{u}m od matematikovy smrti)},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
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Jáchim, František. Minima a maxima Pierra de Fermat (k 350 letům od matematikovy smrti). Rozhledy matematicko-fyzikální, Tome 89 (2014) no. 3, pp. 18-25. http://geodesic.mathdoc.fr/item/RMF_2014__89_3_a2/