We shall interrupt the history of projective geometry.

我们要把射影几何的历史断开.

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The synthetic geometers were developing projective geometry.

综合几何学家们在发展射影几何学.

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Connected graded algebra is the main object studied in noncommutative projective geometry.

连通分次代数是非交换射影几何主要研究的具体对象之一.

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American mathematician noted for his work on projective geometry and topology.

不为射影改变的性质的几何学.

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In this paper , the bar fixing problems of spatial four _ bar mechanism are discussed applying projective geometry.

应用画法几何探讨空间四杆机构各杆件的定位问题.

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