## Geometry Seminar - Abstracts

### Talk

Thursday 25 August 2016, 16:00 - 17:00, in HG00.086

**Andrew J. Baker** (University of Glasgow)

*Ring objects and derived ring objects*

### Abstract

Algebraic structures can often be described using operads and
monads. I will explain this for commutative monoids and rigs
(rings without negatives).
A more general idea is to build in homotopies and discuss `highly
homotopy coherent structures' on objects in categories where
homotopy notions make sense. I will discuss examples of monoids
and rigs `up to homotopy' in examples such as topological spaces
and chain complexes over a field.

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