幾何之學,一名形學,為數學之一部。古典之幾何,專研平面及空間;現代之幾何學則專研流形。
「幾何」一語,明人徐光啟所製。初,光啓與意人利馬竇同譯《幾何原本》、取拉丁文「geometria」首三字之音、是爲「幾何」。「幾何」者,權也。
初為狀物、探測之學,古有《九章》《幾何原本》云。今以歐幾里得《幾何原本》為宗,以其重考究、推理也。
而來日以玄,是為格致之基礎。
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