[Chellas, 1980] (See the listing in his index)

**Disambiguation** This "M" is not to be confused with:

- M (von Wright) is T (Feys) [Hughes and Cresswell, 1968, p125] [Lemmon, 1957, p180]
- M (Megill and Bunder) [Megill and Bunder, 1996]

This system is also called EM [Chellas, 1980, p237]

System M is System E + Axiom M [L(p&q) > (Lp&Lq)]

Or in other words:

System R is system M (Chellas) + Axiom C [(Lp&Lq) > L(p&q)] [Chellas, 1980, p237]

© Copyright 2005, by John Halleck, All Rights Reserved.

This page is http://www.cc.utah.edu/~nahaj/logic/structures/systems/m.chellas.html

This page was last modified on August 4th, 2006