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Ideal elements in geometry were already conceived of by Kepler and Desargues, who both dealt with points at infinity. The term ideal itself, however, is a 19th century invention.

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    2025年

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  • Holger Becker

摘要

Ideal elements in geometry were already conceived of by Kepler and Desargues, who both dealt with points at infinity. The term ideal itself, however, is a 19th century invention.