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次元
Wikipedia definition
1. Dimension (vector space)In mathematics, the dimension of a vector space V is the cardinality (i.e. the number of vectors) of a basis of V. For every vector space there exists a basis (if one assumes the axiom of choice), and all bases of a vector space have equal cardinality; as a result the dimension of a vector space is uniquely defined. We say V is finite-dimensional if the dimension of V is finite.
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