**SMS scnews item created by James East at Fri 20 Nov 2009 1421**

Type: Seminar

Distribution: World

Expiry: 27 Nov 2009

**Calendar1: 27 Nov 2009 1205-1255**

**CalLoc1: Carslaw 375**

Auth: jamese@bari.maths.usyd.edu.au

### Algebra Seminar

# Generators in triangulated categories

### Amnon Neeman

#### Friday November 27, 12:05--12:55pm, Carslaw 375

###### Abstract

In classical category theory there is a well-developed, clear understanding of what it means for a set of objects to generate a category. We will review this. The definition only makes sense when the category is "concrete", in the sense of Freyd. Triangulated categories are rarely concrete, and in a very real sense we have yet to understand what is the "right" notion of generators.

I will discuss several definitions that have been made in recent years, and then some tantalizing work by Rosicky.

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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.

James East jamese@maths.usyd.edu.au