Two-and threed imensional euclidean spaces are metric spaces as are inner product spaces vector spaces and certain topological spaces.

二维和三维的欧几里德空间是度量空间。另外，内乘空间、向量空间以及某些拓扑空间等也都是度量空间。

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Two - and three-dimensional Euclidean Spaces are metric Spaces, as are inner product Spaces, vector Spaces, and certain topological Spaces.

二维和三维的欧几里德空间是度量空间。另外，内乘空间、向量空间以及某些拓扑空间等也都是度量空间。

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The inner product algorithm and cross multiply algorithm in the vector calculation are used to deduce active power and reactive power.

利用矢量运算中的内积算法和叉乘算法来推导有功功率和无功功率。

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