The assignments section of the Math 116 website has three recent files posted, called solnchaps56, moresolns, and stillmoresolns, that contain answers to assorted problems from Chapters 5, 6, 7, and 8 of Luenberger. Included are the questions people have been most frequently asking about such as 7.18 (how minimum norm duality follows from fenchel duality) and 8.9 (how linear programming duality follows from fenchel duality). Enjoy,