Physical lectures and the Covid situation

The lectures are starting on Friday Jan 15. However, because of the ongoing Covid situation, there will be no physical lecture on Friday or Monday Jan 18. For now, I leave open the possibility of ordinary lectures on Friday Jan 22. To compensate for the lack of physical lectures, I will post detailed lecture notes, one PDF file that you read yourself and one file with audio recording in which I explain the main parts of the PDF file.