**SMS scnews item created by John Enyang at Tue 28 Aug 2012 1515**

Type: Seminar

Distribution: World

Expiry: 1 Sep 2012

**Calendar1: 31 Aug 2012 1205-1255**

**CalLoc1: Carslaw 175**

Auth: enyang@penyang.pc (assumed)

### Algebra Seminar

# Infinitesimal one-parameter subgroups and exponentiation

### Sobaje

###### Friday 31st August, 12:05--12:55pm, Carslaw 175

###### Speaker:

Paul Sobaje (University of Melbourne)

###### Title:

Infinitesimal one-parameter subgroups and exponentiation

###### Abstract:

Let \(G\) be a semisimple algebraic group over a field of characteristic \(p\). In this talk, we will describe the varieties of infinitesimal one-parameter subgroups of \(G\), and discuss their importance in representation theory. We will also consider a related question which deals with the existence of certain Springer isomorphisms between the nilpotent variety of \(\mathrm{Lie}(G)\) and the unipotent variety of \(G\).

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After the seminar we will take the speaker to lunch.

See the Algebra Seminar web page for information about other seminars in the series.

John Enyang John.Enyang@sydney.edu.au