By combining two irreducible representations of the proper inhomogeneous Lorentz group,
certain irreducible unitary representations of the complete Lorentz group including space …

An examination is made of the consequences for the quantum mechanics of spinning
particles of equations characteristic of Lorentz-covariant position variables. These equations …

A Lorentz covariant description of a particle and antiparticle with spin s= 0, 1 2, 1,⋯ and finite
rest mass is given in this paper. The wave function has 2 (2 s+ 1) components so that no …

RELATIVISTIC WAVE EQUATIONS 201 lower values of therest mass being the stable ones
in each case. In general, it can be shown that for a particle of spin n the number of different …

The possibility of covariantly describing a system of a fixed number of particles interacting
directly is explored by attempting a direct" integration" of the commutation relations for the …

'~ IERZ and Pauli'have developed a general theory of particles with arbitrary spin, both
integral and halfintegral. The quantities describing particles of integral spin are tensors of …

Introduction.-The wave functions, 41, describing the possible states of a quantum
mechanical system form a linear vector spaceV which, in general, is infinite dimensional and …

The present notes do not relate to a subject which is now at the center of interest. To be sure,
symmetry considerations play a great and perhaps still increasing role in theoretical physics …

It is shown that a relativistically invariant classical mechanical Hamiltonian description of a
system of three (spinless) particles admits no interaction between the particles. If a set of ten …

The unitary operators D are determined by the physical content of the theory up to a constant
factor again, which can depend on 1 and 1'. Apart from this constant however, the operations …