The following notes are from the Ramsey DocCourse in Prague 2016. The notes are taken by me and I have edited them. In the process I may have introduced some errors; email me or comment below and I will happily fix them.

**Title**: Euclidean Ramsey Theory 2 (of 3).

**Lecturer**: David Conlon.

**Date**: November 25, 2016.

**Main Topics**: Ramsey implies spherical, an algebraic condition for spherical, partition regular equations, an analogous result for edge Ramsey.

**Definitions**: Spherical, partition regular.

Lecture 1 – Lecture 2 – Lecture 3