Joachim Hilgert forscht und lehrt am Institut für Mathematik der Universität Paderborn.
This is a very useful book for students seeking orientation for their further specialization in mathematics. The presentation of the material is utmost lucid, sufficiently detailed, versatile, and didactically refined. As such, this excellent primer is a perfect source for further, more detailed reading, and a highly useful companion for students in general. (Werner Kleinert, zbMATH 1343.00001, 2016) This is a very useful book for students seeking orientation for their further specialization in mathematics. The presentation of the material is utmost lucid, sufficiently detailed, versatile, and didactically refined. As such, this excellent primer is a perfect source for further, more detailed reading, and a highly useful companion for students in general. (Werner Kleinert, zbMATH 1343.00001, 2016)