Intuition and computational abilities are stressed. Original material on DE and multiple integrals has been expanded.

    It is an old book that was ahead of its time and should still be warmly welcomed by all readers who are curious about what exists beyond the stars.

    His careful presentation of the underlying theories of fluids is still timely and applicable, even in these days of almost limitless computer power. This reissue ensures that a new generation of graduate students experiences the elegance of Professor Batchelor's writing.

    This volume features seventeen early papers that developed quantum theory into its modern form. These papers appeared from 1917 to 1926 and were written by the leading physicists of the early twentieth century.The collection begins with Einstein's "On the Quantum Theory of Radiation," an illuminating derivation of Planck's Law. Other important early papers by Ehrenfest, Bohr, Born, Van Vleck, Kuhn, and others prepared the way for the "turning point" in quantum mechanics. This crucial step is taken in Heisenberg's paper "Quantum-Theoretical Re-Interpretation of Kinematic and Mechanical Relations." Additional papers by Born, Dirac, Pauli, and Jordan develop the theory in full. Eleven of these seventeen papers are reproduced unabridged; all are in English.A 59-page historical introduction by the editor, Professor B. L. van der Waerden, provides connective commentary. Quoting from relevant correspondence, noting the thinking behind each discovery, and evaluating the extent of each individual's contribution, it re-creates the era's intellectual foment and excitement.

    Little change has been made in the text except that the para- graphs V- 4.5, VI- 4.3, and VIII- 1.4 have been completely rewritten, and a number of minor errors, mostly typographical, have been corrected. The author would like to thank many readers who brought the errors to his attention. Due to these changes, some theorems, lemmas, and formulas of the first edition are missing from the new edition while new ones are added. The new ones have numbers different from those attached to the old ones which they may have replaced. Despite considerable expansion, the bibliography i" not intended to be complete. Berkeley, April 1976 TosIO RATO Preface to the First Edition This book is intended to give a systematic presentation of perturba- tion theory for linear operators. It is hoped that the book will be useful to students as well as to mature scientists, both in mathematics and in the physical sciences.

    Guyford Stever Food & Nutrition/William Henry Sebrell Giant Molecules/Herman Francis Mark Growth/James Mourilyan Tanner Health & Disease/Rene Jules Dubos Light & Vision Machines/Robert O'Brien Man & Space/Arthur C. Clarke Mathematics/David Bergamini Matter/Ralph Eugene Lapp Planets/Carl Sagan Ships/Edward V. Lewis Sound & Hearing/Stanley Smith Stevens The Body/Alan Edward Nourse The Cell/John E. Pfeiffer The Engineer/C.C. Furnas The Mind/John Rowan Wilson The Physician/Russel V. Lee The Scientist/Henry Margenau Time/Samuel Abraham Goudsmit Water/Luna Bergere Leopold Weather/Phillip D. Thompson Wheels/Wilfred Owen