## Paper: Weak Topology and a Differentiable Operator for Lipschitz Maps (at LICS 2008)

**Abbas Edalat**

### Abstract

We show that the Scott topology induces a topology for real-valued Lipschitz maps on Banach spaces which we call the L-topology. It is the weakest topology with respect to which the L-derivative operator, as a second order functional which maps the space of Lipschitz functions into the function space of non-empty weak* compact and convex valued maps equipped with the Scott topology, is continuous. For finite dimensional Euclidean spaces, where the L-derivative and the Clarke gradient coincide, we provide a simple characterisation of the basic open subsets of the L-topology in terms of ties or primitive maps of functions. We use this to verify that the L-topology is strictly coarser than the well-known Lipschitz norm topology. We then develop a fundamental theorem of calculus of second order in finite dimensions showing that the continuous integral operator from the continuous Scott domain of non-empty convex and compact valued functions to the continuous Scott domain of ties is inverse to the continuous operator induced by the L-derivative.

### BibTeX

@InProceedings{Edalat-WeakTopologyandaDif, author = {Abbas Edalat}, title = {Weak Topology and a Differentiable Operator for Lipschitz Maps}, booktitle = {Proceedings of the Twenty-Third Annual IEEE Symposium on Logic in Computer Science (LICS 2008)}, year = {2008}, month = {June}, pages = {364--375}, location = {Pittsburgh, PA, USA}, publisher = {IEEE Computer Society Press} }