Note that the row and column order is the same as the element order in each set, and the index variable names are consistent between lines 12, 13, and 14.
注意行和列的次序与元素在每个集合中的顺序是相同的，索引变量名在第12、13和14行是一致的。
Because all nine of the elements are selected as a set, the position is the index of an element within that set.
由于所有9个元素被选择为一个集合，所以position是该集合中一个元素的索引。
A point operator by means of interval index of an element in the interval valued fuzzy set is introduced.
借助区间值模糊集中元素的区间指数，引入点算子，该算子将一区间值模糊集与一模糊集族联系起来。
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