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https://doi.org/10.1007/978-3-662-25201-7o nonlinear evolution equations, we pass to the most recent applications to equations in 1+1 and 3+1 space-time dimensions, In particular the proof of existence of global solutions to the coupled Maxwell-Dirac equations is briefly outlined.

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https://doi.org/10.1007/978-3-662-56080-8 1, 2, 3, arbitrary-dimensional cases as well as to other examples directly and simply connected with the harmonic context. We study their dynamical and kinematical (super)symmetries and their inclusions are mentioned.

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Recent developments in non linear representations and evolution equations,o nonlinear evolution equations, we pass to the most recent applications to equations in 1+1 and 3+1 space-time dimensions, In particular the proof of existence of global solutions to the coupled Maxwell-Dirac equations is briefly outlined.

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Algebraic expressions for classes of generalized 6-, and 9-, symbols for certain Lie groups,Several methods are described for finding formulas for multiplicity-free 6-. and 9-. symbols, including generalizations of Schwinger‘s generating functions. The recent method of Cerkaski for finding a class of 6-. symbols with one multiplicity index is illustrated with an example for Sp(6).

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Constrained lagrangians in N = 2-superspace formulations for the constant magnetic field system,so-called standard and spin orbit coupling supersymmetrization procedures respectively and deal with chiral-type constraints. Our simple change of variables connecting the two-dimensional harmonic oscillator and the constant magnetic field contexts does also work in these superspace formulations.

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