Algebra seminar by David Stewart

Charlotte Scott Centre for Algebra

On Wednesday the 30th of January 2019, David Stewart (Newcastle University) will be visiting the Charlotte Scott Centre for Algebra and giving a seminar on Gröbner bases, smooth centralisers and the Lefschetz principle. His talk will be at 3pm in INB 3305. All are welcome.


His talk abstract is as follows:

“(Joint with Ben Martin and Lewis Topley).  In a paper in the now defunct LMS Journal of Computation I used GAP to compute the Lie-theoretic centralisers in the exceptional groups of elements in their minimal modules in all characteristics, establishing when the centralisers in the groups were smooth. Non-smoothness was only found in very small characteristics, even where there are infinitely many orbits. This led to a question on when all centralisers of elements in a Z-defined representation would be smooth if the characteristic were large enough. With my co-authors we managed to prove this using the Lefschetz principle from…

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