Saccheri - Saccheri (English spelling) Girolamo Saccheri

Japanese: サッケリ - さっけり（英語表記）Girolamo Saccheri

1667‐1733
Italian mathematician. He was a Jesuit priest by profession, but from 1699 he taught mathematics at the University of Pavia for the rest of his life. He was interested in Euclid's parallel postulate, and wrote Logica demonstrativa (1697) in which he first investigated the essence of its definition. He then developed a system of Euclides ob omni naevo vindicatus (1733) in which he developed the first 26 theorems of Euclid that could be proved without the parallel postulate, as well as a system that arises from assumptions that deny the parallel postulate, thereby attempting to prove the parallel postulate.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

1667‐1733
イタリアの数学者。本職はイエズス会の聖職者であったが，1699年からは終生パビア大学で数学の講座をもった。ユークリッドの平行線公準に関心をもち，《証明的論理学Logica demonstrativa》(1697)を著して，まず定義の本質を究明し，続いて主著《あらゆる欠点が除かれたユークリッドEuclides ob omni naevo vindicatus》(1733)において，平行線公準なしに証明できるユークリッドの最初の26個の定理および平行線公準を否定した仮定から生ずる体系を展開し，それによって平行線公準を証明しようとした。

出典　株式会社平凡社世界大百科事典第２版について　情報

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