Pietsch’s variants of s-numbers for multilinear operators
2021
We study variants of s-numbers in the context of multilinear operators. The notion of an $$s^{(k)}$$
-scale of k-linear operators is defined. In particular, we shall deal with multilinear variants of the $$s^{(k)}$$
-scales of the approximation, Gelfand, Hilbert, Kolmogorov and Weyl numbers. We investigate whether the fundamental properties of important s-numbers of linear operators are inherited to the multilinear case. We prove relationships among some $$s^{(k)}$$
-numbers of k-linear operators with their corresponding classical Pietsch’s s-numbers of a generalized Banach dual operator, from the Banach dual of the range space to the space of k-linear forms, on the product of the domain spaces of a given k-linear operator.
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