Mathematics is distinguished from the sciences by the freedom it enjoys in choosing basic assumptions from which consequences can be deduced by applying the laws of logic. We call the basic ...

There is no satisfactory theory of three-dimensional non-Euclidean geometry, from an intuitional point of view, unless it gives us a clear three-dimensional image in our ordinary space, assuming, of ...

The aim of this paper is to prove a trace theorem for Besov functions in the metric setting, generalizing a known result from A. Jonsson and H. Wallin in the Euclidean case. We show that the trace of ...

E. Bour, Théorie de la déformation des surfaces, Journal de l’ Êcole Imperiale Polytechnique 22, Cahier 39 (1862), 1-148. M. P. Do Carmo and M. Dajczer, Helicoidal surfaces with constant mean ...