Нашли опечатку? Выделите ее мышкой и нажмите Ctrl+Enter
Название: Systems of partial differential equations and Lie pseudogroups
Автор: Pommaret J.F.
Аннотация:
In mathematics, a pseudogroup is an extension of the group concept, but one that grew out of the geometric approach of Sophus Lie, rather than out of abstract algebra (such as quasigroup, for example). A theory of pseudogroups was developed by Élie Cartan in the early 1900s.