Now showing items 1206-1225 of 1660

• #### On conjugacy of MASAs and the outer automorphism group of the Cuntz algebra ﻿

[OWP-2013-21] (Mathematisches Forschungsinstitut Oberwolfach, 2013-10-29)
We investigate the structure of the outer automorphism group of the Cuntz algebra and the closely related problem of conjugacy of MASAa in $\mathcal{O}_n$. In particular, we exhibit an uncountable family of MASAs, conjugate ...
• #### On densities of lattice arrangements intersecting every i-dimensional affine subspace ﻿

[OWP-2016-08] (Mathematisches Forschungsinstitut Oberwolfach, 2016-05-10)
In 1978, Makai Jr. established a remarkable connection between the volume-product of a convex body, its maximal lattice packing density and the minimal density of a lattice arrangement of its polar body intersecting every ...
• #### On Generalizations of Kac-Moody Groups ﻿

[OWP-2010-06] (Mathematisches Forschungsinstitut Oberwolfach, 2010-03-10)
In [7] we define a Curtis-Tits group as a certain generalization of a Kac-Moody group. We distinguish between orientable and non-orientable Curtis-Tits groups and identify all orientable Curtis-Tits groups as Kac-Moody ...
• #### On Local Combinatorial Formulas for Chern Classes of Triangulated Circle Bundle ﻿

[OWP-2016-16] (Mathematisches Forschungsinstitut Oberwolfach, 2016-08-17)
Principal circle bundle over a PL polyhedron can be triangulated and thus obtains combinatorics. The triangulation is assembled from triangulated circle bundles over simplices. To every triangulated circle bundle over a ...
• #### On Logic, Choices and Games ﻿

[SNAP-2019-009-EN] (Mathematisches Forschungsinstitut Oberwolfach, 2019-09-04)
Can we always mathematically formalise our taste and preferences? We discuss how this has been done historically in the field of game theory, and how recent ideas from logic and computer science have brought an interesting ...
• #### On periodic solutions and global dynamics in a periodic differential delay equation ﻿

[OWP-2014-08] (Mathematisches Forschungsinstitut Oberwolfach, 2014-05-13)