Demyanov, Vladimir, and Pallaschke, Diethard. "Point derivations for Lipschitz functions andClarke's generalized derivative." Applicationes Mathematicae 24.4 (1997): 465-474. <http://eudml.org/doc/219186>.
@article{Demyanov1997,
abstract = {Clarke’s generalized derivative $f^0(x,v)$ is studied as a function on the Banach algebra Lip(X,d) of bounded Lipschitz functions f defined on an open subset X of a normed vector space E. For fixed $x\in X$ and fixed $v\in E$ the function $f^0(x,v)$ is continuous and sublinear in $f\in Lip(X,d)$. It is shown that all linear functionals in the support set of this continuous sublinear function satisfy Leibniz’s product rule and are thus point derivations. A characterization of the support set in terms of point derivations is given.},
author = {Demyanov, Vladimir, Pallaschke, Diethard},
journal = {Applicationes Mathematicae},
keywords = {point derivations; generalized directional derivative; Lipschitz functions},
language = {eng},
number = {4},
pages = {465-474},
title = {Point derivations for Lipschitz functions andClarke's generalized derivative},
url = {http://eudml.org/doc/219186},
volume = {24},
year = {1997},
}
TY - JOUR
AU - Demyanov, Vladimir
AU - Pallaschke, Diethard
TI - Point derivations for Lipschitz functions andClarke's generalized derivative
JO - Applicationes Mathematicae
PY - 1997
VL - 24
IS - 4
SP - 465
EP - 474
AB - Clarke’s generalized derivative $f^0(x,v)$ is studied as a function on the Banach algebra Lip(X,d) of bounded Lipschitz functions f defined on an open subset X of a normed vector space E. For fixed $x\in X$ and fixed $v\in E$ the function $f^0(x,v)$ is continuous and sublinear in $f\in Lip(X,d)$. It is shown that all linear functionals in the support set of this continuous sublinear function satisfy Leibniz’s product rule and are thus point derivations. A characterization of the support set in terms of point derivations is given.
LA - eng
KW - point derivations; generalized directional derivative; Lipschitz functions
UR - http://eudml.org/doc/219186
ER -