(1) The Theory of Groups and Quantum Mechanics (2) L'Atome de Bohr: la mécanique analytique et les quanta, les spectres de multiplets (3) The Physical Significance of the Quantum Theory

Abstract

(1) AN English edition of Prof. H. Weyl's well-known book is very welcome; the book remains a difficult one to read, but to anyone with an imperfect knowledge of German the task will be considerably lightened by the translation. The translation has been made from the second German edition, which differs from the first in that certain chapters, notably Chap. v., which originally were more condensed and harder to understand than the rest of the book, have been rewritten in a simpler way. Also in the third chapter, in which group theory is first introduced, an example, namely, the Chbsch-Gordan series, is given of a group and of its reduction. Another welcome addition is a discussion of the Heisenberg-Pauli theory of the quantisation of the radiation field, which has appeared since the first edition of Prof. Weyl's book.

(1) The Theory of Groups and Quantum Mechanics.

By Prof. Hermann Weyl. Translated from the second (revised) German edition by Prof. H. P. Robertson. Pp. xxii + 422. (London: Methuen and Co., Ltd., 1931.) 21s. net.

(2) L'Atome de Bohr: la mécanique analytique et les quanta, les spectres de multiplets.

Par Prof. Léon Brillouin. (Recueil des Conférences-Rapports de documentation sur la Physique.) La théorie des quanta. Deuxième édition. Pp. 363. (Paris: Les Presses universitaires de France, 1931.) 100 francs.

(3) The Physical Significance of the Quantum Theory.

By Prof. F. A. Lindemann. Pp. vii + 148. (Oxford: Clarendon Press; London: Oxford University Press, 1932.) 7s. 6d. net.