Note the nonstandard vertex! Many thanks to Mark Grant for organising TTT83.
10.30 – 11.00 Physics C10 (Coffee Room) 
Tea, Coffee and Biscuits 
11.00 – 12.00 Physics C12 
Hellen Colman (Wright College, Chicago) A notion of LScategory internal to the category of orbifolds Classically, an orbifold is defined as a topological space equipped with an orbifold structure given by an equivalence class of orbifold atlases. From a modern point of view, these atlases and equivalence classes are described in terms of topological groupoids and Morita equivalences. We show that there is a Quillen model structure on the category of orbifolds considered as topological groupoids, and discuss the abstract notion of LScategory derived from this model. This is a new numerical invariant for topological groupoids which generalizes the LusternikSchnirelmann category of topological spaces. 

LUNCH 
14.00 – 15.00 Physics C12 
Michael Weiss (Aberdeen) Smooth maps to the plane and Pontryagin classes An obviouslooking conjecture about the rational cohomology of BTOP(n) (where TOP(n) is the group of homeomorphisms from Euclidean nspace to itself) can be reformulated as a conjecture about certain spaces of smooth regular (=nonsingular) maps to the plane. In order to get somewhere with the reformulated conjecture, we embed spaces of smooth regular maps in spaces of smooth maps with some wellunderstood singularities. This follows the concordance theory and parameterized Morse theory tradition. The new aspect is that we have maps to the plane, not to the real line; and a new symmetry group O(2) instead of O(1). Joint work with Rui Reis. 
15.00 – 16.00 Physics C10 (Coffee Room) 
Tea, Coffee and Biscuits 
16.00 – 17.00 Mathematics A17 
Dirk Schuetz (Durham) Configuration spaces of linkages in high dimensions A closed linkage in ddimensional Euclidean space
consists of n segments, each of a given length, consecutively joined
to each other so that the resulting broken line begins and ends at
the origin. We consider the configuration space of all such closed
linkages up to rotations, in particular its dependence on the given
lengths of the segments. 
For information on how to get to the University Park campus, see here: http://www.nottingham.ac.uk/about/datesandcampusinformation/mapsanddirections/universityparkcampus.aspx
A map of the campus (Mathematics is building 20, Physics building 22): http://www.nottingham.ac.uk/sharedresources/documents/mapuniversitypark.pdf
Everyone who wishes to participate is welcome, particularly postgraduate students. We shall operate the usual criteria for assistance with travel expenses, but beneficiaries will need to complete the standard forms (available from the main TTT page), and should come armed with NI numbers and details of UK bank accounts if they want to complete the form on the day.