The set of problems that make up the content of this book may need to be given a more detailed introduction than a conventional mathematical monograph. These problems are considered unsolved in the sense that the author does not know their solutions. In this sense, this small collection is significantly different in nature from the well-known collection of Poya and Sege problems. Questions drawn from various fields of mathematics are in no way central to these fields, but rather reflect the personal interests of the author.