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Category: 數學類

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非欧几里得几何，简称非欧几何，是多个几何形式系统的统称，与欧几里得几何的差别在于第五公设。
古希腊数学家欧几里得的《几何原本》提出了五条公设：
从一點向另一點可以引一条直线。
任意线段能无限延伸成一...