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A preliminary definition of logic
The term "logic" came from the Greek word logos, which is sometimes translated
as "sentence", "discourse", "reason", "rule", and "ratio". Of course, these translations
are not enough to help us understand the more specialized meaning of "logic" as
it is used today.
So what is logic? Briefly speaking, we might define logic as the study of the
principles of correct reasoning. This is a rough definition, because how logic should
be properly defined is actually quite a controversial matter. However, for the purpose
of this tour, we thought it would be useful to give you at least some rough idea
as to the subject matter that you will be studying. So this is what we shall try
to do on this page.
Logic is not the psychology of reasoning
One thing you should note about this definition is that logic is concerned with
the principles of correct reasoning. Studying the correct principles of reasoning
is not the same as studying the psychology of reasoning. Logic is the former discipline,
and it tells us how we ought to reason if we want to reason correctly. Whether people
actually follow these rules of correct reasoning is an empirical matter, something
that is not the concern of logic.
The psychology of reasoning, on the other hand, is an empirical science. It tells
us about the actual reasoning habits of people, including their mistakes. A psychologist
studying reasoning might be interested in how people's ability to reason varies
with age. But such empirical facts are of no concern to the logician.