A set with only one element in it.
The only proper subset of such a set is the null set.
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The only proper subset of a set comprising one element, is the null set.
If you start with a set with only one element [16187191] then there can be only one proper subset: the empty set.
Proper subset definitionA proper subset of a set A is a subset of A that is not equal to A. In other words, if B is a proper subset of A, then all elements of B are in Abut A contains at least one element that is not in B.For example, if A={1,3,5} then B={1,5} is a proper subset of A. The set C={1,3,5} is a subset of A, but it is not a proper subset of A since C=A. The set D={1,4} is not even a subset of A, since 4 is not an element of A.
By: Tedd Mikhail Ulit ( sori yan lang po yung nasa libro eh :)) The line, itself, is a subset (though not a proper subset). A ray is a subset of a line with one end-point which extends in only one direction. A line segment is a subset of a line with two end points. A point is a subset of a line. Finally, nothing is a subset (the null subset) of a line.
The set X is a proper subset of Y if Xcontains none or more elements from Y and there is at least one element of Y that is not in X.