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hep-th1994
On Equations with Universal Invariance
Dan Radu Grigore
A general discussion of equations with universal invariance for a scalar field is provided in the framework of Lagrangian theory of first-order systems.
hep-th1994
Free Fields for Any Spin in Relativistic Quantum Mechanics
D. R. Grigore
A general discussion of the construction of free fields based on Weinberg anszatz is provided and various applications appearing in the litterature are considered.
hep-th1994
Hamiltonian Mechanics in 1+2 Dimensions
D. R. Grigore
A complete list of all transitive symplectic manifolds of the Poincaré and Galilei group in 1+2 dimensions is given.