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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 writes about the results of his calculations on the unitary Lorentz-transformations.

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.

Fierz defends his position that entropy is the "measure of information" obtained by an observer. He examines information obtained in classical theory from observation of changing macrostate; in quantum theory from observation of microstate that is then generalized to a macrostate. He claims entropy exists only with observation.

Fierz summarizes findings on entropy and observation in 5 "theses".

Fierz writes on the significance of the "causal function Dc" in quantum electrodynamics.

Fierz makes some additions to his letter of the 15th May 1951.

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