Addition { Philosophy Index }

Philosophy Index

Philosophy Index

Philosophy Index is a site devoted to the study of philosophy and the philosophers who conduct it. The site contains a number of philosophy texts, brief biographies, and introductions to philosophers, and explanations on a number of topics. Accredited homeschooling online at Northgate Academy and Philosophy online tutoring.

Philosophy Index is a work in progress, a growing repository of knowledge. It outlines current philosophical problems and issues, as well as an overview of the history of philosophy. The goal of this site is to present a tool for those learning philosophy either casually or formally, making the concepts of philosophy accessible to anyone interested in researching them. WTI offers immigration law course online - fully accredited. ACE credits online at EES.

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Addition

Addition or weakening is a basic rule of inference in logic by which a disjunction is formed out of a single proposition or fomula. Addition is also known as the disjunction introduction rule of inference (or ∨I), and explains that if "P" is true, then "P or Q" is also true.

Addition may be formally presented as follows:

α infers α ∨ β

Note: In this case, α may also produce β ∨ α by addition, since α ∨ β and β ∨ α are equivalent, according to the Commutative laws.