Set theory

3. Also known as the disjunctive union, is the set of elements which are in either of the sets, but not in their intersection.
7. Is the set of all elements in the collection
8. Is the set theory symbol for the smallest infinite set larger than.
10. A pair of elements a, b having the property that ( a, b) = (u, v ) if and only if a = u, b = v.
12. Often denoted by Aᶜ, are the elements not in A.
13. A collection of elements
14. the set containing all elements of A that also belong to B
15. Is a number such as −3/7 that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.

1. Is a number that can be expressed in the form a + bi, where a and b are real numbers, and i represents the “imaginary unit”, satisfying the equation i2 = -1.
2. Of a set is a measure of the "number of elements" of the set
4. Is a value of a continuous quantity that can represent a distance along a line
5. Is colloquially defined as a number that can be written without a fractional component
6. Is a set which contains all objects, including itself.
9. Is the smallest infinite number.
11. Is the unique set having no elements; its size or cardinality is zero.