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Guide to Logical Definitions and Argumentation Study Guide

This guide explores various methods of defining terms, including extensional, intensional, and ostensive definitions. It delves into the importance of clarity in language, the risks of vagueness, and the criteria for evaluating the acceptability of premises in arguments. The guide also covers common fallacies and cognitive biases that can affect reasoning, providing a comprehensive framework for critical thinking and effective argumentation.

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Argument Clarity and Language

The Importance of Clarity

Understanding why clarifying language and maintaining consistency is the first step in both constructing and evaluating arguments.

Vagueness and Its Risks

Learning how vague terms lack definite meaning and can make premises unacceptable in formal arguments.

Euphemisms and Emotional Language

Analyzing how mild/indirect phrasing (euphemisms) and emotionally charged words can distort reports and arguments.

The Fallacy of Equivocation

Identifying when an argument fails because it shifts between different meanings of a single word or phrase.

Verbal vs. Real Disputes

Differentiating between disagreements caused by different uses of words (verbal) and disagreements about actual facts (real).

Defining Terms Precisely

Extensional Definitions

Learning how to define a term by listing the members of the class it covers.

  • Enumeration
  • Listing members
  • Finite sets
  • Primary colors
  • Planets
  • Vowels

Intensional Definitions

Understanding definitions that identify the essential qualities or characteristics of a concept.

  • Qualities
  • Attributes
  • Characteristics
  • Celestial body
  • Speech sound

Genus and Differentia

Mastering the method of defining a term by its broad category (genus) and its distinguishing features (differentia).

Evaluating Premise Acceptability

Criteria for Acceptability

Studying what makes a premise true, likely true, or reasonable to believe.

Logical Consistency

Understanding the minimal requirement that premises must not contradict one another.

Sources of Acceptable Premises

Exploring self-evident truths, definitions, observation reports, and expert authority.

Begging the Question

Identifying the fallacy where an argument assumes its conclusion within its premises.

Questionable vs. Unacceptable

Distinguishing between premises that are simply unproven (questionable) and those that are demonstrably false or inconsistent (unacceptable).

Relevance and Sufficiency

Internal Relevance

Determining if premises make a conclusion more or less likely to be true.

Red Herring Fallacy

Identifying distractions that divert attention away from the actual topic of discussion.

Straw Man Fallacy

Recognizing when an opponent's argument is misrepresented or distorted to make it easier to attack.

Deductive vs. Inductive Sufficiency

Understanding the difference between absolute logical guarantee (deductive) and probabilistic support (inductive).

Hasty Generalizations

Identifying when a conclusion is drawn from too little evidence or insufficient variety.

Argumentative Obligations

Learning the importance of presenting a balanced case and addressing known objections.

Bias and Belief Systems

Belief Systems and Networks

Understanding how individual beliefs hang together and influence the interpretation of arguments.

Cognitive Biases

Studying specific errors in judgment like the Overconfidence Effect, Dunning-Kruger Effect, and Confirmation Bias.

The Halo Effect

Recognizing the tendency to attribute positive qualities to people based on unrelated traits like attractiveness.

Motivated Reasoning

Understanding how we reason in ways specifically designed to reach conclusions we desire.

Vested Interests

Analyzing how financial, social, or personal stakes can motivate dishonesty in communication.

Slanting: Omission and Distortion

Identifying how facts are selectively presented (omission) or exaggerated (distortion) to create illegitimate bias.

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