Terms
SYMBOLS
well-defined 0r not
1

is a well- defined group of objects, called elements that share a common characteristic

SETS

1

SET

{  }

1

Set of Citrus fruits

well defined

2

It is a set whose elements are members of another set.

SUBSETS

2

SUBSET

2

Basketball team in the PBA

well defined

3

contains all the elements being considered in a given situation

UNIVERSAL SET

3

ELEMENT

   ∈

3

favorite marvel movies

 not well defined

4

an empty set. It has no element. The null set is a subset of any set

NULL SET

4

UNIVERSAL

U

4

good looking korean actors

not well defined