title: Possibilities that Matter: An Introduction to Material Modal Logic (Metaphysica in Nuce) (Volume 2)
author:  Steven M Duncan 
description: Steven M. Duncan (1954-) earned his PhD in Philosophy from the University of Washington in 1987. He taught as a TA and Adjunct philosophy instructor at various colleges and universities from 1976-2015, when he retired from Bellevue College. He is author of five books, including The Proof of the External World (2007) and How Free Will Works (2011), both published by Wipf and Stock. In addition, he has uploaded fifty papers to the Philpapers website. He and his wife Corazon reside in Tukwila, Washington.
zlib_text:  
  Clarendon Library of Logic and Philosophy
   
  Graeme Forbes
  The Metaphysics
  of Modality
   
  Web Edition
  
   
  I
   
   
   
  have
   
   written this book with two purposes in mind. First, I wanted
  to produce something which a reader could use as a means of entry
  into the area of analytic metaphysics concerned with modality.
  Secondly, I wanted to make a contribution to the literature in this
  area which would be of interest to those working in it. A reader of
  the latter sort may recognize that much of the content of this book
  has appeared in rather disconnected fashion in various journal
  papers over the last few years, but it is my hope that even those
  familiar with those papers will ﬁnd something new here in what I
  say about topics covered in them, and something worthwhile in
  what I say about topics on which I have not previously written. I
  also hope that the theory of individual essences with which this
  book is mainly concerned beneﬁts from being presented as a whole
  in a single place.
  I have tried t