左矢是量子化学基础理论中一个重要的基本概念。从泛函分析的基本理论出发探讨了左矢的数学意义，并给出了左矢的一些特殊性质。%Bra is a basic concept in quantum chemistry.Discussed the related functional significance according to the functional analysis,and disclosed some unique features of the bra hinted in the definition.
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