数学物理学报(英文版) ›› 1988, Vol. 8 ›› Issue (4): 361-372.
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定光桂
Ding Guanggui
摘要： The strictly (theorized) "equidistant operater" does not come into existence. What can be seen in practice is "almost equidistant" operator. The description of "almost equidistance" is essentially a form of "absolute error", and in this paper we will study the "almost equidistance (isometry)" described by the form of "relative error".