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Pictures
of Functions Book Description:
This
book is a module about functions and how to picture them.
In general, when a function is defined, its domain and range
are not given explicitly. It is defined as a relation between
two variables x (represents the elements in the domain and
is called the independent variable) and y (represents the
elements in the codomain and is called the dependent variable).
In order to show that y depends on x, we write y = f(x),
and f is called a function. For each x, f(x) is called the
image of x, and x is called a pre-image of f(x). The collection
of all f(x) is called the range of f.
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