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Critical Thinking: Formal Fallacies

Posted by Hallee on Dec 19, 2009 in Critical Thinking, homeschooling

An argument is called “valid” when it’s form is correct and does not lend to a mistake in reasoning due to a faulty structure. An argument is deemed “cogent” when its form is valid and its premises are sound. In logic, “valid” means that if the premises are true, the conclusion is also true. A fallacy can occur when the form is adulterated to reach a false conclusion.

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Critical Thinking: The Laws of Thought

Posted by Hallee on Nov 28, 2009 in Critical Thinking, homeschooling

The Laws of Thought
1. The Law of Identity
2. The Law of Noncontradiction
3. The Law of Excluded Middle (aka. Excluded Third)

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