Author received the 1962 Fields Medal
Author received the 1988 Wolf Prize (honoring achievemnets of a lifetime)
Author is leading expert in partial differential equations
From the reviews:
"...these volumes are excellently written and make for greatly profitable reading. For years to come they will surely be a main reference for anyone wishing to study partial differential operators."-- MATHEMATICAL REVIEWS
"This volume focuses on linear partial differential operators with constant coefficients ... . Each chapter ends with notes on the literature, and there is a large bibliography. ... The binding of this softcover reprint seems quite good ... . Overall, it is great to have this book back at an affordable price. It really does deserve to be described as a classic." (Fernando Q. Gouvêa, MathDL, January, 2005)