What do a.m. and p.m. stand for?

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
1855-60 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for formal logic
  • The benefit of formal logic is that it is pure syntax.
  • Any formal logic in these pieces would exist solely in the minds of misguided listeners.
  • While logical reasoning skills are related to success in science, the relationship between thought and formal logic is not clear.
  • Symbols without referents can be manipulated according to the laws of formal logic.
  • Laws of discursive thought, being a text book of formal logic.
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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