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In the 18th century and more frequently in the 19th century, various writers began to use words meaning ‘saddle’ to illustrate certain surfaces, particularly the hyperbolic paraboloid and, later, the pseudosphere.

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  • 发表日期：

    2025年

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  • Holger Becker

摘要

In the 18th century and more frequently in the 19th century, various writers began to use words meaning ‘saddle’ to illustrate certain surfaces, particularly the hyperbolic paraboloid and, later, the pseudosphere.