• Lectures by Chapter
    • Chapter 1: The Art and Science of Sound Reasoning
    • Part 1: Finding Clarity
      • Chapter 2: Concepts and Terms
      • Chapter 3: Knowing What We’re Talking About
      • Chapter 4: The Arts of Division and Definition
    • Part 2: Expressing Truth
      • Chapter 5: Judgments and Propositions
      • Chapter 6: Opposition and Equivalence
    • Part 3: Expanding Knowledge
      • Chapter 7: The Categorical Syllogism
      • Chapter 8: Compound Syllogisms
      • Chapter 9: Advanced Deductive Arguments
      • Chapter 10: Inductive Reasoning
    • Part 4: Detecting Fallacies
      • Chapter 11: Informal Fallacies
  • About our text
  • About Mark Grannis

Logic Lectures

  • November 21, 2024

    Lecture 4.3: Real and Nominal Definition

    You’ve been using definitions for as long as you can remember. It’s high time you understood what you’ve been doing.

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  • November 18, 2024

    Lecture 4.2: Rules for (Good) Division

    Division may be one of the most powerful tools ever invented for teaching or learning–but it has to be done correctly. We’ll explore the four major requirements for good division.

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  • November 14, 2024

    Lecture 4.1: Division

    We’ve finally learned enough material logic to understand two of the most powerful ways we use logic in education and in professional life: division and definition. We start with division.

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  • November 7, 2024

    Lecture 3.7: The Non-Essential Predicables

    We conclude our discussion of the Five Predicables by considering the two non-essential predicables of property and accident.

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  • November 2, 2024

    Lecture 3.5/3.6: The Five Predicables, and the Essential Predicables

    As we shift from the Ten Categories to the Five Predicables, we also shift from the perspective of intension to the perspective of extension. In this lecture, we learn the vocabulary and the analytical tools necessary to understand how everything relates (in terms of extension) to the many universals that can be used to describe

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  • November 2, 2024

    Lecture 3.4: Predication, Qualification, and Abstraction

    OK, we know the Ten Categories. So what? What can we do with them? But also in this lecture, we work some of the examples from pp. 72 and 76 of our text.

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