Page 43 - Mesleki Ingilizce Dersi E-Portfolyosu

SETS IN

MATHEMATICS

WHAT IS A SET?

Sets are

represented by
Groups formed by bringing together various objects

are called sets. capital letters

such as A,B,C.
Objects are elements of the set to which they belong.

EXAMPLE
E: is the element.

Ɇ: is not an element. A

.1 .2 2 ∈ A: 2 is an element of A.

5 ∉ A: 5 is not an element A .
.3 .4

5

NUMBER OF ELEMENTS

AND THE EMPTY SET Set A= All days in a

week
The number of elements of a set is represented Set B= Flying cat

by the symbol s ( ).

S(A)= 7
Sets without elements are called empty sets. It is

denoted by the symbols Ø and { }. S(B)= Ø

SET

REPRESENTATIONS

In Venn

.2 .3
Venn diagram .5 .7 diagrams,

elements of

the sets are
List method A={2,3,5,7}
given with dots

in front of

Common feature A={prime number} them, e.g. , .1

method .5

OPERATIONS IN SETS

INTERSECTION UNION

The set of common items is called The set of all elements is called a

the intersection set.It is indicated union set. It is indicated by the

by the symbol "∩". symbol "∪".

A={2,3,5,7} A={1,3,5,7}

B={3,5,9} B={2,4,6,8}

A∩B={3,5} A∪B={1,2,3,4,5,6,7,8}

Meltem SARI