Keywords: Cover set
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Journal Articles
Grey Systems: Theory and Application (2013) 3 (2): 177–190.
Published: 23 August 2013
... Publishing Limited 2013 Grey number is a real number under a given information background and we merely know the range or possible values of the grey number but do not know the certain value of it. As a real number it could not be differentiated as continuous or discrete. But as a value‐covered set...

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