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formal logic

the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions.
Origin of formal logic
First recorded in 1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for formal logic
Historical Examples
  • "formal logic" is too technical for any but well prepared students.

    Six Major Prophets Edwin Emery Slosson
  • Physiological questions are not to be settled by formal logic.

    Tobacco and Alcohol John Fiske
  • But this is not the problem with which formal logic is occupied.

    Kant's Theory of Knowledge

    Harold Arthur Prichard
  • (b) formal logic clearly will not quail before the charge of uselessness.

    Pragmatism D.L. Murray
  • Unless this can be done there is no science of formal logic.

    Logic Carveth Read
  • How are modals treated by (a) formal logic and (b) by the theory of induction?

    Logic Carveth Read
  • Taken by itself, the Greek argument is a nice piece of formal logic.

  • Mr. Joseph handles it by formal logic purely, as if he had no acquaintance with the logic of hypothesis at all.

  • Boole, Jevons, and others have applied the algebraic method not only to formal logic but to political economy.

  • For reasons of formal logic, too, the idea of progress in the universe is unthinkable.

British Dictionary definitions for formal logic

formal logic

Also called symbolic logic. the study of systems of deductive argument in which symbols are used to represent precisely defined categories of expressions Compare philosophical logic
a specific formal system that can be interpreted as representing a fragment of natural argument
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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