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Informal logic information


For the journal, see Informal Logic (journal).
Informal logic
Argument terminology used in logic

Informal logic encompasses the principles of logic and logical thought outside of a formal setting (characterized by the usage of particular statements). However, the precise definition of "informal logic" is a matter of some dispute.[1] Ralph H. Johnson and J. Anthony Blair define informal logic as "a branch of logic whose task is to develop non-formal standards, criteria, procedures for the analysis, interpretation, evaluation, criticism and construction of argumentation."[2] This definition reflects what had been implicit in their practice and what others were doing in their informal logic texts.

Informal logic is associated with informal fallacies, critical thinking, the thinking skills movement[3] and the interdisciplinary inquiry known as argumentation theory. Frans H. van Eemeren writes that the label "informal logic" covers a "collection of normative approaches to the study of reasoning in ordinary language that remain closer to the practice of argumentation than formal logic."[4]

  1. ^ See Johnson 1999 for a survey of definitions.
  2. ^ Johnson, Ralph H., and Blair, J. Anthony (1987), "The Current State of Informal Logic", Informal Logic, 9(2–3), 147–151. Johnson & Blair added "... in everyday discourse" but in (2000), modified their definition, and broadened the focus now to include the sorts of argument that occurs not just in everyday discourse but also disciplined inquiry—what Weinstein (1990) calls "stylized discourse."
  3. ^ Resnick, 1989
  4. ^ Cite error: The named reference LunsfordWilson2009 was invoked but never defined (see the help page).

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Informal logic

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Informal logic encompasses the principles of logic and logical thought outside of a formal setting (characterized by the usage of particular statements)...

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Logic

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Logic is the study of correct reasoning. It includes both formal and informal logic. Formal logic is the study of deductively valid inferences or logical...

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Fallacy

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Walton, Informal logic: A handbook for critical argumentation. Cambridge University Press, 1989. [ISBN missing] Douglas, Walton (1987). Informal Fallacies...

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Informal fallacy

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(2004). "Bayesian Informal Logic and Fallacy". Informal Logic. 24 (1): 41–70. doi:10.22329/il.v24i1.2132. Vleet, Van Jacob E. (2010). Informal Logical Fallacies:...

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Philosophy of logic

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can be categorized as formal or informal fallacies depending on whether they belong to formal or informal logic. Logic has mostly been concerned with definitory...

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Philosophy

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2023. Blair, J. Anthony; Johnson, Ralph H. (2000). "Informal Logic: An Overview". Informal Logic. 20 (2). doi:10.22329/il.v20i2.2262. Archived from the...

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List of logic symbols

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contains logic symbols. Without proper rendering support, you may see question marks, boxes, or other symbols instead of logic symbols. In logic, a set...

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Outline of logic

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Formal logic Free logic Fuzzy logic Higher-order logic Infinitary logic Informal logic Intensional logic Intermediate logic Interpretability logic Intuitionistic...

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Logic translation

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for logic in general since it is needed to establish a link between many forms of reasoning and abstract logical systems. The use of informal logic is...

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Argument

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formal logic (historically called symbolic logic, more commonly referred to as mathematical logic today) and are expressed in a formal language. Informal logic...

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List of fallacies

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original on 2016-11-21. Retrieved 2016-10-04. Walton, Douglas (2008). Informal Logic: A Pragmatic Approach (2nd ed.). Cambridge University Press. ISBN 9780511408786...

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Deductive reasoning

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Logic, Semantics, Metamathematics: Papers from 1923 to 1938. Hackett. ISBN 978-0-915-14476-1. Vorobej, Mark (1992). "Defining Deduction". Informal Logic...

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Critical thinking

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legitimate only when it conforms to the procedures of informal (and, to a lesser extent, formal) logic and that the good thinker necessarily aims for styles...

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Logic puzzle

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A logic puzzle is a puzzle deriving from the mathematical field of deduction. The logic puzzle was first produced by Charles Lutwidge Dodgson, who is...

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Argumentation theory

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The current state of informal logic. Informal Logic 9, 147–51. Ralph H. Johnson. & Blair, J. Anthony. (1996). Informal logic and critical thinking....

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Logical reasoning

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studying logical reasoning is called logic. It is divided into formal and informal logic, which study formal and informal logical reasoning. Traditionally...

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Abductive reasoning

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Douglas (2001). "Abductive, presumptive and plausible arguments". Informal Logic. 21 (2): 141–169. CiteSeerX 10.1.1.127.1593. doi:10.22329/il.v21i2.2241...

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Appeal to nature

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whether informal logic should be considered "real" logic. Today, informal logic enjoys a more conciliatory relationship with formal logic. Its attempt to...

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Argument from ignorance

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ignorance represents "a lack of contrary evidence"), is a fallacy in informal logic. It asserts that a proposition is true because it has not yet been proven...

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Formal fallacy

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Historians' Fallacies: Toward a Logic of Historical Thought, Harper Torchbooks, 1970. Douglas N. Walton, Informal logic: A handbook for critical argumentation...

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Straw man

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tiger – Chinese phrase for an ineffectual threat Pooh-pooh – Fallacy in informal logic Red herring – Fallacious approach to mislead an audience Tilting at...

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Logical form

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In logic, the logical form of a statement is a precisely-specified semantic version of that statement in a formal systemic . Informally, the logical form...

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Objection

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(argument), used in informal logic and argument mapping Inference objection, a special case of the above Counterargument, in informal logic, an objection to...

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Begging the question

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In classical rhetoric and logic, begging the question or assuming the conclusion (Latin: petītiō principiī) is an informal fallacy that occurs when an...

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Faulty generalization

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rule Package-deal fallacy – Logical fallacy Pooh-pooh – Fallacy in informal logic Problem of induction – Question of whether inductive reasoning leads...

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Circular reasoning

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of theory and problems of logic. McGraw-Hill Professional. p. 205. ISBN 9780070466494. Walton, Douglas (2008). Informal Logic: A Pragmatic Approach. Cambridge...

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