There is quantitative difference between Birkhoff orthogonality and isosceles orthogonality.In order to characterize the quantitative difference,this paper introduced the geometric constant D(x).Obtained some results about D(x).%等腰正交和Birkhoff正交之间存在着量化差异,为了刻画这种差异,引入了几何常数,对这个几何常数的相关性质进行研究,给出了几个结论.
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