Functions
WHAT IS A FUNCTION?
A function is a rule that assigns to each element in a set , a unique
element, called (), in a set .
The set is called the domain of the function. The set is called the co-domain.
For each in , () is called the image of . The
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Complex numbers
WHAT ARE NUMBERS?
You should be familiar with some number systems such as the natural numbers, integers,
rational numbers and real numbers.
Natural numbers: =
Integers: =
Rational numbers: =
Real numbers:
Different number systems are usef
Vectors
WHAT IS A VECTOR?
For the purposes of this course, a vector is a quantity that has length and direction.
(Sometimes we say magnitude rather than length.)
We can represent a vector geometrically by an arrow; its length represents the vector's
magni