HP -28S Manual page 5

The HP-28S Owner's Manual (this manual) contains three parts. Part
1,
"Fundamentals," demonstrates how to work some simple problems.
Part 2, "Summary of Calculator Features," builds on part 1 to help
you apply those examples to your own problems. Part 3, "Program-
ming," describes programming features and demonstrates them in a
series of programming examples.
The HP-28S Reference Manual gives detailed information about com-
mands. It is a dictionary of menus, describing the concepts and
commands for each menu.
We recommend that you first work through the examples in part 1 of
the Owner's Manual to get comfortable with the calculator, and then
look at part 2 to gain a broader understanding of the calculator's op-
eration. When you want to know more about a particular command,
look it up in the Reference Manual. When you want to learn about
programming, read part 3 of the Owner's Manual.
These manuals show you how to use the HP-28S to do math, but
they don't teach math. We assume that you're already familiar with
the relevant mathematical principles. For example, to use the calculus
features of the HP-28S effectively, you should know elementary
calculus.
On the other hand, you don't need to understand all the math topics
in the HP-28S to use those parts of interest to you. For example, you
don't need to understand calculus to use the statistical capabilities.
4 Welcome to the HP-285