3,771 research outputs found
Harmonic morphisms from the Grassmannians and their non-compact duals
In this paper we give a unified framework for the construction of complex
valued harmonic morphisms from the real, complex and quaternionic Grassmannians
and their non-compact duals. This gives a positive answer to the corresponding
open existence problem in the real and quaternionic cases.Comment: 21 page
Harmonic morphisms from four dimensional Lie groups
We consider four dimensional Lie groups with left-invariant Riemannian
metrics. For such groups we classify left-invariant conformal foliations with
minimal leaves of codimension two. These foliations produce local
complex-valued harmonic morphisms
Complete minimal submanifolds of compact Lie groups
We give a new method for manufacturing complete minimal submanifolds of
compact Lie groups and their homogeneous quotient spaces. For this we make use
of harmonic morphisms and basic representation theory of Lie groups. We then
apply our method to construct many examples of compact minimal submanifolds of
the special unitary groups
Social positioning: Designing the Seams between Social, Physical and Digital Space
Mobile settings are not only physically and digitally mediated; they are also inhabited by people - a social space. We argue that careful design exposing the connections, gaps, overlays and mismatches within and between physical, digital and social space allow for a better understanding and thereby mastering of the resulting combined space. Two concepts are explored in MobiTip, a social mobile service for exchanging opinions among peers: intramedia seams concerning network coverage and position technology, and intermedia seams between digitally transmitted tips and the physical, social context surrounding the user. We introduce social positioning as an alternative and complement to the current strive for seamless connectedness and exact positioning in physical space
Design Principals of Social Navigation
8th Delos Workshop on "User Interfaces for Digital Libraries" (on 21 October it will be held in conjuction with the 4th ERCIM Workshop on "User Interfaces for All"), SICS, Kista, Sweden, 21-23 October 1998PERSON
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