• 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

  • September 11, 2024

    Lecture 1.2: Skepticism About Truth

    Before we spend a year learning about the way to distinguish what’s true from what’s false, we probably ought to confront the radically skeptical suggestion that truth doesn’t really exist.

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  • September 9, 2024

    Lecture 1.1: A Way of Knowing the Truth

    Pilate’s question, “What is truth?” deserves an answer. Logic helps us give one.

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  • September 9, 2024

    Lecture 1.0 for Home Students

    If you’re not at The Heights, you’d probably prefer this shorter introduction to the lectures ahead.

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  • September 9, 2024

    Classroom lecture 1.0: Some housekeeping, and an introduction to the study of traditional logic

    Here are the slides for the first day of class, with my narration. We had more housekeeping than usual, but still managed to get into some substantive points.

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  • September 8, 2024

    New for 2024-2025: Classroom lectures available at logiclectures.com

    With 65-75 logic students in my logic classes at The Heights every year, it’s perfectly normal to have one or more absences every day of class. This year, I’m going to try something new: using slides in class, and posting those slides on this site after class so that any student who missed class can

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