We study the book

O. Forster:  Lectures on Riemann surfaces

with addenda of analytic perturbation theory, based on Kato's book and the book of Baumgärtel,

but using the more modern reults on algebraic functions in Forster.

A copy of the book is available in the internet (titled Foster instead of Forster).

In contradistinction to the first announcement exercises  will be held on Monday, 10-12. But lectures are on

Thursday 10-12 and Friday 12-14.