Module 2: Language and Informal Fallacies

Language and Informal Fallacies Overview

Natural languages such as English are disorderly. They grow and develop and change over time, often in unpredictable ways, at the whim of the people using them. Although the primary business of this unit is Informal Fallacies, it is important to take a very quick look at some ways in which natural language creates fertile ground for fallacious communications.

So before even explaining what fallacies are all about, we will begin with a brief look at some attributes of natural (aka ordinary) language. An understanding of certain language features will be helpful for recognizing good arguments and fallacious ones. Next, we consider fallacies in general, both formal and informal. And finally, we reach the meat of this unit where we examine four families of informal fallacies up close.


Learning Objectives

After successful completion of Module 2, you will be able to:

  1. Identify types and purposes of definitions and language passages that are vague, ambiguous, prescriptive, descriptive, and emotive.
  2. Distinguish between formal and informal logical fallacies.
  3. Detect and identify informal fallacies.

Module 2 Roadmap

  • Section 2.1: We start by looking at some characteristics of ordinary language that can impair straightforward communication.
  • Section 2.2: Next, we move to logical fallacies overall and the distinction between formal and informal ones.
  • Sections 2.3 through 2.6 will bring us to in-depth looks at these four families of informal fallacies:
    • Fallacies of Distraction (2.3)
    • Fallacies of Weak Induction (2.4)
    • Fallacies of Illicit Presumption (2.5)
    • Fallacies of Linguistic Emphasis (2.6)

Key Terms

  • ambiguous
  • cognitive meaning
  • definiendum
  • definiens
  • descriptive
  • emotive meaning
  • fallacies of distraction
  • fallacies of illicit presumption
  • fallacies of linguistic emphasis
  • fallacies of weak induction
  • formal fallacy
  • illicit
  • implicature
  • informal fallacy
  • prescriptive
  • vague

Definitions for these terms are available in the course Glossary.


 

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An Introduction to Logic Copyright © 2024 by Kathy Eldred is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License, except where otherwise noted.

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