在数学定义中，递归是十分常见的，如fibonacci数列(斐波那契数列)。
Definitions in mathematics are often given recursively. For instance, the Fibonacci sequence is defined recursively.
最后，基于数学工具———代数系统，给出了空间数据立方体严格的数学定义。
At last, based on a mathematical tool: algebraic system, this paper gives definition of spatial data cube.
基于严格的数学定义，该模型不仅能创造优美的视觉图像，也能对其进行灵活控制。
Based on its solid mathematical definition, DBBS provides not only visually appealing shapes but also flexible manipulations.
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