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On the strength of a system of partial differential equations

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Schutz,  Bernard F.
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
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Citation

Schutz, B. F. (1975). On the strength of a system of partial differential equations. Journal of Mathematical Physics, 16(4), 855-856. doi:10.1063/1.522619.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-0F36-E
Abstract
It is shown that Einstein's concept of the ''strength'' of a system of differential equations is directly related to the number of dynamical degrees of freedom the equations permit. It may become a useful tool for investigating the structure of the system.