This revised second edition of Christopher Sogge's 1995 work provides a self-contained account of the basic facts concerning the linear wave equation and the methods from harmonic analysis that are necessary when studying nonlinear hyperbolic differential equations. Sogge examines quasilinear equations with small data where the Klainerman-Sobolev inequalities and weighted space-time estimates are introduced to prove global existence results. New simplified arguments are given in the current edition that allow one to handle quasilinear systems with multiple wave speeds. The next topic concerns semilinear equations with small initial data. John's existence theorem for R1+3 is discussed with blow-up problems and some results for the spherically symmetric case. After this, general Strichartz estimates are treated. A proof of the endpoint Strichartz estimates of Keel and Tao and the Christ-Kiselev lemma are given, the material being new in this edition. Using the Strichartz estimates, the critical wave equation in R1+3 is studied.

About the Author

Christopher Sogge received his PhD from E.M. Stein at Princeton University in 1985. He has been an NSF Postdoctoral Fellow (1985-1988), a Sloan Research Fellow (1988-1989), a Guggenheim Fellow (2005-2006), and a recipient of a Presidential Young Investigator Award (1988-1993). He has held positions at the University of Chicago (1985-1989) and UCLA (1989-1996), and he currently is a Professor at the Johns Hopkins University. Professor Sogge’s research interests include Fourier analysis, partial differential equations, and geometry.

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