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All LessonsFree Lessons (4)

Introduction to Logical Thinking

A Nugget from the World of Logic The Logical Flow of the Course on Logic

Fallacies in Logic

Fallacies and Fallacious Arguments Fallacies of Relevance Fallacies of Defective Induction Fallacies of Ambiguity Exercise: Recognize and Apply Invalid Everyday Arguments

Logical Argument

Logic and Language Syntax and Semantics Complicating Sentences Using Logical Operators The IF-THEN Implication Build a Logical Argument Exercise: Recognize an Argument

What Is Logic?

The Definition and Scope of Logic Building Blocks of Logic Validity and Truth Discover the Laws of Logic Knowledge and Reasoning Logician vs. Scientist Exercise: Recognize Valid Arguments in Everyday Life

First Theory of Logic: Aristotle’s Logic

Categorical Propositions Categorical Syllogism and Forms First Mechanization for Validity

Second Theory of Logic: Propositional Logic

Relaxing Some Constraints of Syllogism

Symbols and Connectives

Validity through Truth Tables

Rules of Inference

Rules of Substitution

Proofs by Natural Deduction

Exercise: Truth Table Knowledge

Third Theory of Logic: Predicate Logic

Predicate Logic Predicate Functions and Quantifiers Validity through Predicate Logic

Logical Reasoning in Action

Logic in a Legal Case Logic in Problem Solving and Puzzles Logic in Computing

Wrap Up

Logical Milestone

Logical Thinking/

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Exercise: Truth Table Knowledge

Exercise: Truth Table Knowledge

Test your truth table knowledge.

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Exercise tasks

Exercise tasks

In the following tasks, you’re required to click the output box (row, column) where $p$ and $q$ ...