Volume 48, Number 4 December 2014 Issue 190

	TABLE OF CONTENTS
154	Message from the SIGSAM Chair I. Kotsireas
155	On Solution Spaces of Products of Linear Differential or Difference Operators S. Abramov, M. Barkatou
166	The design of Maple's sum-of-products and POLY data structures for representing mathematical objects M. Monagan, R. Pearce
187	ISSAC 2014 Software Presentations D. Lichtblau
202	Abstracts of recent Doctoral Dissertations in Computer Algebra
203	Federated Computing Research Conference (FCRC 2015)
204	Recent and Upcoming Events
	Single PDF file of Issue 190