# 106385 SEMINAR IN TOPOLOGY 2

## WINTER SEMESTER 2017/18

Daniel J. Woodhouse

The original course description (we will actually cover roughly half of this)

## General Online Resources

## Specific Recommended reading:

### Part 1: Residual Finiteness and Subgroup Separability

A blog entry discussing residual finiteness and Hopfian groups.

A blog entry discussing Marshall Hall's theorem for free groups.

A different blog entry discussing residual finiteness.

A blog entry discussing subgroups separability.

### Part 2: CAT(0) Geometry

Specifically sections 2 and 3 of Henry Wilton's Notes

The comprehensive text that gives full and extensive detail. Available in all good libraries. Don't buy it with your own money.

### Part 3: CAT(0) Cube Complexes, Sageev's Dual Cube Complex Construction, and Virtual Specialness

Wise and Hruska's general account of the dual cube complex machinery.

Michah Sageev's PCMI notes. A good exercise is to realise that the language of pocsets gives the same outcome as the wallspace terminology.