12* Sigurdur Helgason, Differential Geometry and Symmetric Spaces T. 10 Modern Analysis Volume 11 Volume I l l Volume I V Volume V Volume V l VOl. DieudonnC, Treatise on Analysis: Volume I, Foundations of VOl. 9 Spaces, Third Edition of Solution of Equations and Systems of Equations J. Ostrowski, Solution of Equations in Euclidean and Banach VOl. 6 Herbert Busemann, The Geometry of Geodesics Claude Chevalley, Fundamental Concepts of Algebra VOl. 4 Differential Equations in Mathematical Physics Ralph Philip Boas, Jr., Entire Functions VOl. Schiffer, Kernel Functions and Elliptic VOl. PURE A N D APPLIED MATHEMATICS Arnold Sommerfeld, Partial Differential Equations in Physics Reinhold Baer, Linear Algebra and Projective Geometry Herbert Busemann and Paul Kelly, Projective Geometry and Projective Metrics Stefan Bergman and M.