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Free

Level 1: From Everyday Language to Logic

TAKE THIS COURSE FOR FREE! This course takes you step-by-step through the most basic elements of logical analysis: your key to critical thinking mastery.

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$14.95

Level 2: Logical Properties & Logical Relationships

Learn how to construct truth-tables and use them to identify logical properties like necessary truth & contingency and to test for logical relationships like consistency & contradiction.

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$14.95

Level 3: Using Argument Forms To Test For Validity

Can't tell a modus ponens from a modus tollens? This course covers some of the most common valid and invalid argument forms and their uses in evaluating real-life arguments.

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$9.95

Level 4: Using Truth-Tables To Test For Validity

You've mastered the use of truth-tables to identify logical properties and relationships. Now use them to test arguments for validity.

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$12.95

Level 5: The Indirect Method

AKA "Turbo Truth-Tables" - This method allows those already familiar with traditional truth-tables to identify logical relationships and test for validity with lightning speed!

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$17.95

Level 6: Proof By Natural Deduction

Learn to construct step-by-step logical proofs of validity. Along the way you'll master some of the most important entailment & equivalence relationships in logic.

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