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ESyMath

Verwischte Tafel mit mathematischen Formeln
© P. Pollmeier/Universität Bielefeld
ESyMath Seminar
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ESyMath Seminar

Coloured chalk, sponge and wiper on a table
© Universität Bielefeld

As we aim to provide a prospering environment for collaborative research project proposals, including those that go beyond mathematics, we will organise a seminar serving as an inspiring place to discuss and develop novel ideas.

Upcomping Talks

Why physicists love kagome lattices

a portrait photograph of Jürgen Schnack
© Universität Bielefeld/P. Pollmeier

Kagome lattices do not just make nice pictures for TRR proposals, they also constitute a paradigmatic example of frustrated quantum magnetism. In my presentation I will qualitatively explain what the fascinating magnetic properties are by contrasting them with the usual (boring) properties of bipartite antiferromagnets.

Explained with as much mathematics as I can.

12:00h - TRR Multimedia Room, UHG M4-122/126

tba

10:30h - Lecture Hall H5
A joint RCM² Colloquium

Previous Talks

The cost of cyclic permutations

16:15h - Lecture Hall H10
A joint RCM² Colloquium

Inplace rotation of an array involves nothing but moving data around in computer memory. As modern computer architectures involve several layers of caching, it is a surprisingly non-trivial problem. We describe a competitively fast algorithm (as indicated by measurements) and asymptotically count the number of data moves in the best, worst, and average case. It turns out that this task is equivalent to determining the expected sum of remainders encountered in a run of the Euclidean algorithm, which in turn can be estimated using tools from analytic number theory.
I shall motivate, describe and discuss this algorithm in detail an also compare it to several other reasonable choices.
(Joint work with Valentin Blomer)

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