In this paper we characterize hypersurfaces for which their Hadamard product is still a hypersurface Then study and, more generally, varieties are idempotent under powers.

In this paper we will prove certain Hadamard and Fejer-Hadamard inequalities for the functions whose nth derivatives are convex by using Caputo k-fractional derivatives. These results have some relationship with inequalities for Caputo fractional derivatives.

The Hadamard Extension $\mathbb H({\mathrm {m}})$ of an notation="LaTeX">$n \times k$ matrix m is the collection all products subsets its rows. This construction essential for source identification (parameter estimation) a mixture not...