Abstract
Although grey systems theory has been successfully utilized in many fields and demonstrated promising results, literatures show its performance still could be improved. Remarks on grey number and algorithms of grey numbers need to be farther discussed. Grey number is the basic element of grey systems theory. The algorithms of grey numbers are the foundation of grey mathematics. This paper modifies the definition of grey number and discusses several remarks on grey number. We propose a method for abstracting information of grey number covered set. And we propose the algorithms of simple grey numbers, complex grey numbers and multiple grey numbers. All these works are meaningful to bring grey mathematics to perfection and propose more grey applying models.
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