摘要
An open problem was proposed in [1](2.11.28): in induced spaces, can we express the interior (closure) of a fuzzy set A as the union of a family of fuzzy sets which take corresponding constant value on the interior (closure)of each level set of A?
<正> An open problem was proposed in [1](2.11.28): in induced spaces, can we express the interior (closure) of a fuzzy set A as the union of a family of fuzzy sets which take corresponding constant value on the interior (closure)of each level set of A?
基金
Project supported by the National Natural Science Foundation of China