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Research

Research lectures, seminars and events

The events listed in this area are research seminars, workshops and lectures hosted by Durham University departments and research institutes. If you are not a member of the University, but  wish to enquire about attending one of the events please contact the organiser or host department.


 

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Events for 7 June 2018

Supanat Kamtue: Rigidity for the discrete Bonnet-Myers diameter bound. Which graphs look like a sphere ?

1:00pm, CM301

The Bonnet-Myers theorem is a classical theorem which gives an estimate of the diameter in term of the positive Ricci curvature bound of a manifold. In the discrete setting of graphs, Ollivier’s notion of Ricci curvature provides a discrete analogue of Bonnet-Myers theorem. In view of Cheng’s rigidity result, it is natural to ask for which graphs the Bonnet-Myers estimates is sharp. We call such graphs Bonnet-Myers sharp graphs.

We prove that, under an extra condition of antipodalness (i.e. each vertex has a vertex whose distance between them is equal to the diameter), a Bonnet-Myers sharp graph must be ``strongly spherical”, which is a combinatorial property that has been completely classified. The proof includes a new method of transport geodesic, which I will explain in my talk.

This is joint work with Bourne, Cushing, Koolen, Liu, M\”{u}nch, and Peyerimhoff.

Contact mark.a.powell@durham.ac.uk, andrew.lobb@durham.ac.uk, wilhelm.klingenberg@durham.ac.uk for more information about this event.


Prof. Nicholas Adams: Augustine, Evil and Two Phases of the Concept

4:00pm, Palace Green Room 28 (D/PG28), Palace Green, Durham

Contact simon.oliver@durham.ac.uk for more information about this event.


Roundtable Discussion: Professor Todd Reeser (University of Pittsburgh) 'Setting Plato Straight: Translating Ancient Sexuality in the Renaissance'

4:30pm to 6:00pm, Ritson Room, Classics Department, 38 North Bailey

Contact marc.schachter@durham.ac.uk for more information about this event.


Structuring Knowledges: Translating Structures/Structuring Translations - Roundtable discussion

4:30pm to 6:00pm, Ritson Room, Department of Classics, 38 North Bailey, Durham University, Professor Todd Reeser (University of Pittsburgh)

Contact marc.schachter@durham.ac.uk for more information about this event.