Dear All. A slightly extended, revised and prettified version of my lecture notes "*The shallow and the deep - a biased introduction to neural networks* * and old school machine learning*" can be downloaded at https://hdl.handle.net/11370/e08667bd-2e84-4956-b9d3-45b9e957634d This pre-publication version is freely available for non-commercial use and teaching purposes. The copyright remains with the author. --------------------------------------------------- Dr. Michael Biehl Bernoulli Institute for Mathematics, Computer Science & Artificial Intelligence P.O. Box 407, 9700 AK Groningen, NL https://www.cs.rug.nl/~biehl