On the internal approach to differential equations. I: The involutiveness and standard basis. (English) Zbl 1399.58001

Summary: The article treats the geometrical theory of partial differential equations in the absolute sense, i.e., without any additional structures and especially without any preferred choice of independent and dependent variables. The equations are subject to arbitrary transformations of variables in the widest possible sense. In this preparatory Part 1, the involutivity and the related standard bases are investigated as a technical tool within the framework of commutative algebra. The particular case of ordinary differential equations is briefly mentioned in order to demonstrate the strength of this approach in the study of the structure, symmetries and constrained variational integrals under the simplifying condition of one independent variable. In full generality, these topics will be investigated in subsequent parts of this article.


58A17 Pfaffian systems
35A30 Geometric theory, characteristics, transformations in context of PDEs
58E30 Variational principles in infinite-dimensional spaces
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