Some Logical Identities

     The figure to the right provides a listing of some of the more important logical identities. To the right of the identity is listed either the property that is the basis for the identity (for example, idempotence) or the common name given to the identity (for example, contrapositive). These identities are provided mainly for reference. In looking over the identities, think back to your high school algebra class where you learned various identities for equations. This is exactly analogous. Logic is also a kind of algebra.

Propositional Logic: Some Intuitive Ideas

Deduction

© Charles F. Schmidt