Logic on the Web

Wikipedia

Wikipedia articles are written by thousands of anonymous people who edit each other's contributions. These articles tend to be short and explain the broad spectrum of each subject. By following links to related subjects, one can spend hours and hours on the giant wikipedia web site!

Wikipedia.org/wiki/Logic This is a broad overview of all the different subjects in logic. You need some knowledge of logic to understand what they're talking about in this article.
Wikipedia.org/wiki/History_of_logic This is the story of how logic developed from ancient times, through Aristotle and Islamic thought, and into the Enlightenment.
Wikipedia.org/wiki/Deductive_reasoning Reasoning that starts with premises and finishes with a conclusion that necessarily follows from those premises.
Wikipedia.org/wiki/Inductive_reasoning Reasoning that starts with evidence and finishes with a conclusion that is not necessarily true, but is probably true.
Wikipedia.org/wiki/Informal_logic We don't normally use formal logic in our everyday lives. Informal logic is the study of how to improve everyday reasoning.
Wikipedia.org/wiki/Critical_thinking Critical thinking is popular term that is related to informal logic. Classes in critical thinking are often taught in college to help students make good decisions and become less gullible.
Wikipedia.org/wiki/Argumentation_theory This is the science of debate, dialogue, conversation, and persuasion.
Wikipedia.org/wiki/Syllogism A syllogism consists of three parts: the major premise, the minor premise, and the conclusion.
Wikipedia.org/wiki/Organon "The Organon" is the name of Aristotle's six works on logic.
Wikipedia.org/wiki/Symbolic_logic Usually divided into two sub fields, propositional logic and predicate logic.
Wikipedia.org/wiki/Propositional_calculus If you can understand this stuff, you're very smart and should probably start a career in computer programing or astrophysics.
Wikipedia.org/wiki/Predicate_logic Predicate logic is the generic term for symbolic formal systems like first-order logic, second-order logic, many-sorted logic or infinitary logic.
Wikipedia.org/wiki/Modal_logic Modal logic is any system of formal logic that attempts to deal with modalities.

Logical Fallacies

Wikipedia.org/wiki/Fallacy Defines fallacies and talks about different types of fallacies.
Stephen's Guide to Fallacies A very extensive resource for the different types of fallacies.
The Writing Center Gives definitions and examples of several of the most popular fallacies.
FallacyFiles.org All the fallacies organized and explained.
SoYouWana.com A fun page on the most common logical errors.
Conversational Terrorism Takes fallacies one more step by giving funny real-life examples.
The Fallacy Zoo is a site on all the traditional fallacies. A man who wants to increase general understanding of fallacies set up this site. He was tired of explaining the fallacies to people over the email.
Short List of Fallacies in Indonesian (Same Page)

General Logic

Summit Ministries Summit Ministries' page on Critical Thinking introduces the subject from the point-of-view of a Christian world-view. It teaches some major concepts and the most important logical fallacies.
Argumentation and Critical Thinking Tutorial is a website of tests designed to help students practice some of the logic they are learning.

Christian Logic

Logic in Apologetics – Unbelievers use logic, and we can turn discussions with them around by showing how the their logic is inconsistent, or that it begins with the wrong premises.
Critical Thinking and Logic is an article by Doug Wilson on the difference between humanistic critical thinking skills and Christian logic.

If you've found a web site you think we should add to this list, leave us a comment below.

Comments

1 • Mike • May 14, 2008 • 7:08 PM

http://www.aristotelianlogic.glashoff.net/ This is a website that lets you enter all your
premises in standard Aristotelian(I,O,A,E) form, and it computes the
logical implications according to Aristotelian logic. Pretty cool.