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math.GM2023
Gravitational Waves and Pommaret Bases
J. -F. Pommaret
The first finite length differential sequence, now called {\it Janet sequence}, has been introduced by Janet in 1920. Thanks to the first book of Pommaret in 1978, this algorithmic…
math.GM2023
General Relativity and Gauge Theory: Beyond the Mirror
J. -F. Pommaret
Lie pseudogroups are groups of transformations solutions of systems of ordinary (OD) or partial differential (PD) equations. The purpose of this paper is to present an elementary s…