Article ID: CBB226796701

Maurice Janet’s algorithms on systems of linear partial differential equations (2021)

unapi

This article describes the emergence of formal methods in theory of partial differential equations (PDE) in the French school of mathematics through Janet’s work in the period 1913–1930. In his thesis and in a series of articles published during this period, Janet introduced an original formal approach to deal with the solvability of the problem of initial conditions for finite linear PDE systems. His constructions implicitly used an interpretation of a monomial PDE system as a generating family of a multiplicative set of monomials. He introduced an algorithmic method on multiplicative sets to compute compatibility conditions, and to study the problem of the existence and the uniqueness of a solution to a linear PDE system with given initial conditions. The compatibility conditions are formulated using a refinement of the division operation on monomials defined with respect to a partition of the set of variables into multiplicative and non-multiplicative variables. Janet was a pioneer in the development of these algorithmic methods, and the completion procedure that he introduced on polynomials was the first one in a long and rich series of works on completion methods which appeared independently throughout the twentieth-century in various algebraic contexts.

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Authors & Contributors
Tournès, Dominique
Jouve, Guillaume
Amoruso, Nicola
Dryer, Theodora
Jonathan H.P. Dawes
Sacchetti, Andrea
Concepts
Mathematics
Differential equations
Calculus
Algorithms
Algebra
Mathematicians
Time Periods
19th century
18th century
20th century, early
20th century
Medieval
21st century
Places
France
Moscow (Russia)
United States
Spain
China
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