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math.MG2024★ 2 cited
A natural correspondence between quasiconcave functions and fuzzy norms
Javier Cabello Sánchez, Daniel Morales González
In this note we show that the usual notion of fuzzy norm defined on a linear space is equivalent to that of quasiconcave function, in the sense that every fuzzy norm $N:X\times\mat…
math.MG2021
Linearity of isometries between convex Jordan curves
Javier Cabello Sánchez
In this paper, we show that the -differentiability of the norm of a two-dimensional normed space depends only on distances between points of the unit sphere in two different w…