By Howard Anton
By The Math Forum, Jessica Wolk-Stanley
By S. J. Taylor
By Nathan Jacobson
By Paul Abbott
By Mapp, Fiona
By Lawrence W. Swienciki
By Nicholson, Su
By Margaret L. Lial, John Hornsby, Terry McGinnis
By David Poole (Trent University)
By Rachel Riley, Dr Gareth Moore
By Raymond Barnett, Michael Ziegler, Karl Byleen, David Sobecki
By Gilbert Strang (Massachusetts Institute of Technology)
By Mihajlo D. Mesarovic, etc.
By Paul Andrews
By Unknown
By Graham Lawler
By David Alan Herzog
By D. A. Low (Australian National University, Canberra)
By Peter H. Selby, Steve Slavin
By Ron Larson (The Pennsylvania State University, The Behrend College)
By Louis H. Rowen (Bar Ilan University)
By A Brameller, etc.
By Owe Axelsson (Katholieke Universiteit Nijmegen, The Netherlands)
By Professor Ron Larson (Penn State University at Erie), David C Falvo
By Curtis F. Gerald
By Luke Heaton