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'''Logic''' (from [[Ancient Greek|Classical Greek]] λόγος [[logos]]; meaning word, thought, idea, argument, account, reason, or principle) is the study of valid [[inference]] and [[demonstration (proof)|demonstration]].
'''Logic''' (from [[Ancient Greek|Classical Greek]] λόγος [[logos]]; meaning word, thought, idea, argument, account, reason, or principle) is the study of valid [[inference]] and [[demonstration (proof)|demonstration]].
*[[Susan Haack]]. (1996).'' Deviant Logic, Fuzzy Logic: Beyond the Formalism'', University of Chicago Press.
*[[Susan Haack]]. (1996).'' Deviant Logic, Fuzzy Logic: Beyond the Formalism'', University of Chicago Press.
*Nicolas [[Rescher]]. (1964). ''Introduction to Logic'', St. Martin's Press.
*Nicolas [[Rescher]]. (1964). ''Introduction to Logic'', St. Martin's Press.
==External links==
==External links==
* ''[http://www.galilean-library.org/int4.html An Introduction to Philosophical Logic]'', by Paul Newall, aimed at beginners
* ''[http://www.galilean-library.org/int4.html An Introduction to Philosophical Logic]'', by Paul Newall, aimed at beginners
* ''[http://www.fecundity.com/logic/ forall x: an introduction to formal logic]'', by P.D. Magnus, covers sentential and quantified logic
* ''[http://www.fecundity.com/logic/ forall x: an introduction to formal logic]'', by P.D. Magnus, covers sentential and quantified logic
