One of the theorems is called well-ordered theorm: .a For any set A ,we have |A|<|P(A)| .b If S is ordered-isomorphic to T, then |S|=|T| .c Every set can be well-ordered. .d Let X be anonempty partially ordered set in which every ordered subset has an upper bound in X. Then X contains at least one maximal element.

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.