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Fierz agrees with Pauli's remark about entropy.

Fierz writes about the problem of space in connection with field theory and geometry. He makes some remarks on Pauli's two opposites: (+ -) and (p,q), and the speculations about similar opposites in psychology (individual and society). He also writes about Newton's concept of space and on Henry More's influence on him.

Fierz sends a note written by Schiff. He solves a differential field equation.

Fierz gives a detailed description of Henry More's philosophy and theology with several quotations.

Fierz answers Pauli's questions on the method of tranforming operators suggested by Harish-Chandra.

Fierz discusses the unitary representations of the Lorentz group for general functions expanded in vector functions of Harish-Chandra. He applies to Majorana'a equations published in: Nuovo Cimento: 1932.

In this letter, Fierz derives the general expansion for half-integral "Eigenfunctions" of the symmetric top using infinitesimal rotations.

Fierz makes some remarks on Aristotle's realism and its contrast to Plato's idealism.

Fierz writes on the ethical value of music and he sends some quotations from Pauli-Wissowa on the Greek attitude to this problem.

Fierz sends this letter as an addition to his letter of the 28th February 1947 about Chandra's derivation.