Empty Set

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Related to Empty subset: Proper subset

empty set

[′em·tē ′set]
The set with no elements.

Empty Set


(or null set), the set that contains no elements. The concept of the empty set, like the concept of zero, arises from the need to have the result of any operation on sets also be a set. The source of the concept of the empty set is the very method of defining a set by a characteristic property of its elements, since it may not be known beforehand whether elements possessing the property do in fact exist. Thus, it still is not known whether the equation xn + yn = zn, where n is an integer greater than 2, can be solved for x, y, and z if x, y, and z are natural numbers. In other words, it still is not known whether the set of those n > 2 for which the equation is solvable is empty or nonempty.

References in periodicals archive ?
N] be any types of theuniversal and empty subsets, and A, B two neutrosophic crisp subsets on X defined by A = ({a}, {b,d}, {c}}, B = ({a}, {b}, {c, d}} then the family [GAMMA] = {[[phi].
Let <R [union] I> be any neutrosophic ring, a non empty subset P of <R [union] I> is defined to be a neutrosophic ideal of <R [union] I> if the following conditions are satisfied;
To do that, given a perfect matching M in G (which always exists in this case) a possibly empty subset of PEC cycles in [G.
Apr](A), then above definition is definition of fuzzy sub algebra of Hilbert algebra, and so a non empty subset A of X is a sub algebra of X if and only if the characteristic function of A is a fuzzy sub algebra of X.