一个数学概念C的所有等价定义的图式，叫做概念C的概念域。
The schema that all equiralent definitions to a mathematical concept was called a concept field about concept C.
他说，专注于一个定理的感觉，就像“一个猎人，一个数学概念的收集者。”
The sensation of working on a theorem, he says, can be like being “a hunter and gatherer of mathematical concepts.”
多重集：一个数学上的概念，表示了一种从集合中元素到出现次数只见的映射关系。
A mathematical entity that represents a mapping between the elements of a set and the number of times they appear.
多重集：一个数学上的概念，表示了一种从集合中元素到出现次数只见的映射关系。
A mathematical entity that represents a mapping between the elements of a set and the number of times they appear.
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