Tautologies - Research Article from Great Medical Discoveries

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A tautology is a logical proposition with a special property: It is true under all circumstances. This property can be defined more precisely. Logical propositions are made up of basic propositions (usually symbolized by lower-case letters, sometimes italicized; p, q, etc.) joined together by connectives. Typically these connectives include "not" (negation), "and" (conjunction) "or" (disjunction), and the "if-then" relation (implication). Each basic proposition can be assigned a truth-value - either true (T) or false (F). Then the truth of a compound sentence built out of basic propositions and connectives can be calculated with the help of truth functions or truth tables.

A logical proposition is a tautology if it is true regardless of the truth-values of its basic propositions. The final column in a tautology's truth table would consist entirely of T's.

Consider an example: " p or not-p" (e.g. "Elvis is alive or Elvis is not...

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This section contains 407 words
(approx. 2 pages at 300 words per page)
Buy the Tautologies Encyclopedia Article
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Tautologies from Lucent. ©2002-2006 by Lucent Books, an imprint of The Gale Group. All rights reserved.
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