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[section started Jan 2004]
Logic is the study of inference or reasoning.
When people - especially philosophers and logicians - use the term logic, they
tend to have in mind "formal logic," a fairly technical subject usually
involving lots of symbols. The techniques of formal logic are important
theoretically, but have little application to "real world" reasoning, argument
and critical thinking. Most of the rest of this website is concerned with
logic in the broad (non-formal) sense. Nevertheless, every advanced
critical thinker will be familiar with formal logic.
This page selects some (formal) logic resources likely to be useful to people
whose primary interest is in critical thinking. If you are interested in
(formal) logic in its own right, you should consult
one of the
many resource sites devoted to that topic.
See also Guides, Fallacies,
Logic by Garth
A small online textbook without the exercises. Covers the material you
would expect to find in a good one-semester undergraduate introductory logic
subject. Heavily slanted towards formal logic but has sections on topics
such as analogical reasoning and causal inference. Basically sound but a bit
like eating dry wheat biscuits for breakfast. [12 Jan 04]
Manual of Job-Related Thinking Skills - US Dept of Homeland Security
may well find this useful even if you're not applying for promotion in the Dept
of Homeland Security. Much of the document consists of a fairly technical introduction to basic logic. Working through this study guide would probably be good preparation for a range of standard tests involving logical thinking, eg the LSAT. [18 Jun 03]
A Quick Introduction to Logic by Scott Lehmann
A 29 page document (pdf file) covering the basics of logic. Too succinct and technical to be much use the first time you try to learn about logic, but may be handy for someone wanting to refresh on core topics. [5 Jul 03]
Non-Aristotelian Logic in Practice, or How to be much cleverer than all your
friends (so they really hate you) by Mike Alder
Probably the most entertaining introduction to Bayesian Logic you'll ever find.
This essay was published in the magazine
Philosophy Now, which is well worth a visit, or even a subscription. [9 Jun
This page last updated:
01 Jun 2006