Columbia subject headings:
Differential equations.
Functional equations.
Transformations, Infinitesimal.
Harvard subject headings:
Differential equations.
Functional equations.
Hostinský, Bohuslav, 1884-
Transformations, Infinitesimal.
Princeton subject headings:
Differential equations.
Functional equations.
Hostinský, Bohuslav, 1884-
Transformations, Infinitesimal.