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单词 TopologicalRing
释义

topological ring


A ring R which is a topological spaceMathworldPlanetmath is called a topological ring if the addition, multiplication, and the additive inverse functions are continuous functionsMathworldPlanetmath from R×R to R.

A topological division ring is a topological ring such that the multiplicative inverseMathworldPlanetmath function is continuous away from 0. A topological field is a topological division ring that is a field.

Remark. It is easy to see that if R contains the multiplicative identity 1, then R is a topological ring iff addition and multiplication are continuous. This is true because the additive inverse of an element can be written as the product of the element and -1. However, if R does not contain 1, it is necessary to impose the continuity condition on the additive inverse operation.

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更新时间:2025/5/4 23:00:43