_ CHELSEA SCIENTIFIC BOOKS
LES INTEGRALES DE STIELTJES ET LEURS APPLICATIONS AUX PROB-LEMES DE LA PHYSIQUE MATHEMA-TIQUE, By N. Gunther. 1932. 498 pages. inches. $4,95
LECONS SUR LA PROPAGATION DES ONDES ET LES EQUATIONS DE L'HYDRODYNAMIQUE, By J. Hadamard.
viii+375 pages. 5^x8*4. $4.50
"[Hadamard's] unusual analytic proficiency enables him to connect in a wonderful manner the physical problem of propagation of waves and the mathematical problem of Cauchy concerning the characteristics of partial differential equations of the second order."
—Bulletin of the A. M. S.
REELLE FUNKTIONEN. Punktfunk-tionen, By H. Hahn. 1932. 426 pages. 5^x8^. Originally $12.80. $5.50
"admirably suited ... to the needs of the mathematical reader wishing to familiarize himself with ... recent developments." — Bulletin of the A. M. S.
INTRODUCTION TO HILBERT SPACE AND THE THEORY OF SPECTRAL MULTIPLICITY, By P. R. Halmos. About 120 pp. 6x9. (June, 1951). $3.25
Prof. Halmos' latest book gives a clear, readable introductory treatment of Hilbert Space. The multiplicity theory of continuous spectra is treated, for the first time in English, in full generality.
GRUNDZUGE DER MENGENLEHRE, By F. Hausdorff, First edition. 484 pages. 5^x8j4. $4.95
Some of the topics in the Grundzlige omitted from later editions:
Symmetric Sets — Principle of Duality — most of the "Algebra" of Sets— most of the "Ordered Sets"
— Partially Ordered Sets — Arbitrary Sets of Complexes — Normal Types — Initial and Final Ordering
— Complexes of Real Numbers — General Topolog-ical Spaces—Euclidean Spaces — the Special Methods Applicable in the Euclidian Plane — Jordan's separation Theorem — The Theory of Content and Measure — The Theory of the Lebesgue Integral.
VORLESUNGEN UBER DIE THEORIE DER ALGEBRAISCHEN ZAHLEN, By