Letter from G. Field to W. Pauli. Republication of "The theory of relativity".

Letter from G. Field to W. Pauli. Related to the republication of "The theory of relativity".

Letter from G. Field to W. Pauli linked to the publication of "The theory of relativity".

Letter from G. Field to W. Pauli. Linked to the publication of "The theory of relativity".

Letter from G. Field to W. Pauli. Republication of "The theory of relativity".

Letter from G. Field to W. Pauli. Related to the republication of "The theory of relativity".

Letter from G. Field to W. Pauli. Republication of "Theory of Relativtiy".

Letter from G. Field to W. Pauli. Republication of "The theory of relativity".

Letter from Fierz to Pauli about pseudospinor, neutrino and antiparticles.

Reflections and calculations on the fundamental field as a 4x4 matrix $\Psi$ and on a Lagrangian invariance against transformation