Abstract
THERE are few theoretical physicists who at one time or another have not tried to develop a theory of superconductivity ; but all attempts so far have been unsuccessful. It might have been expected that it would be possible to explain such a spectacular phenomenon in a simple way in terms of the properties of electrons in metals. The conclusion has to be drawn, therefore, that we have not yet learned to derive in a satisfactory way the features of an assembly of electrons from their individual properties. Similar failures in other branches of physics (for example, liquid helium II, or the mechanical properties of solids) indicate that these difficulties are not restricted to electrons but concern manybody problems in general. Theorie der Suprialeitung Von M. von Laue. Pp. iii + 124. (Berlin und Gottingen: Springer-Verlag, 1947.) 12 R.marks.
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