It is called an ordered pair.
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If there is an even number of elements in the set, the median is the average of the middle two, when listed in order, least to greatest.
in a set if two elements or numbers are equal then it is known as equivalent set
The set of elements that are elements of the two (or more) given sets is called the intersection of the sets.
Two sets are equal if they have the same elements. Two sets are equivalent if there is a bijection from one set to the other. that is, each element of one set can be mapped, one-to-one, onto elements of the second set.
Think you mean Continuum. a set of elements such that between any two of themthere is a third element. or the set of all real numbers. and any compact, connected set containing at least two elements.