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math.GM2017
On geometry and mechanics
Nikolaos E. Sofronidis
Our purpose in this article is first, following [14], to find the topological upper limits of projections of secant planes to surfaces and the topological upper limits of p…
math.GM2017
Diffeomorphisms of the closed unit disc converging to the identity
Nikolaos E. Sofronidis
If is the group (under composition) of diffeomorphisms of the closed unit disc which are the identity…