# 1998 seminars

## 21/10/1999, Thursday, 14:00–15:00

Carlos Florentino, Instituto Superior Técnico
To be announced

## 21/10/1999, Thursday, 15:00–16:00

Paulo Almeida, Instituto Superior Técnico
To be announced

## 21/10/1999, Thursday, 16:30–17:30

Roger Picken, Instituto Superior Técnico
To be announced

## 25/11/1999, Thursday, 14:00–15:00

Rui Vilela Mendes, Grupo de Física Matemática, Universidade de Lisboa
To be announced

## 25/11/1999, Thursday, 15:00–16:00

Roger Picken, Instituto Superior Técnico
Quantum holonomies in $(2+1)$-dimensional gravity and quantum matrix pairs

In this talk we describe some recent results relating, on the one hand, to a method of quantizing a model of gravity in two space and one time dimensions, and on the other, to an algebraic structure - quantum matrix pairs - appearing in this context, which has many similarities with quantum groups.

References:

1. J. E. Nelson and R. F. Picken, Quantum holonomies in (2+1)-dimensional gravity, gr-qc/9911005.
2. J. E. Nelson and R. F. Picken, Quantum matrix pairs, math.QA/9911015.