Proposition { 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.

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. WOLI offers immigration law course online - fully accredited. ACE credits online at EES.

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Proposition

In logic, a proposition is any sentence that expresses something that is either true or false.

For example, the following are all propositions:

Propositional Variables

By convention, propositions in logic are symbolized using uppercase Roman letters, which indicate propositional variables.

For example, we may symbolize each of the propositions above by letters. For example, we may use the letter P to refer to “All penguins are birds” and the letter S for “Socrates is mortal”. We can then perform logical operations on these words, and say something like P ∧ S, or “All penguins are birds, and Socrates is mortal.”

It is a convention, or tradition, to use the letters beginning with P and Q when referring to argument forms where the specific propositions are unknown or unimportant.