Motivation.define the following terms. you may refer to you textbooks.

Well-defined set is a set with an exact object or element.
Set, In mathematics and logic, any collection of objects (elements), which may be mathematical.
Universal set, the set containing all objects or elements and of which all other sets are subsets.
Subset, a set of which all the elements are contained in another set.
Null set, A set with no members is called an empty, or null, set, and is denoted ∅.

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Answer:

1.The objects of a set are called its elements. If a set has no elements, it is called the empty set and is denoted by ∅

2.set is a collection of elements. The elements that make up a set can be any kind of mathematical object

3.A universal set (usually denoted by U) is a set which has elements of all the related sets, without any repetition of elements.

4.Is a subset of a set B if all elements of A are also elements of B; B is then a superset of A.

5.the null set, also called the empty set, is the set that does not contain anything. It is symbolized or { }. There is only one null set

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