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formal logic

noun
1.
the branch of logic concerned exclusively with the principles of deductive reasoning and with the form rather than the content of propositions.
Origin
1855-1860
1855-60
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for formal-logic

formal logic

noun
1.
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
2.
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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11
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