Sechs Vortraege ueber ausgewaehlte Gegenstaende aus der reinen Mathematik und mathematischen Physik, is a classical book and has been considered important throughout the human history. So that this book is never forgotten we at Alpha Editions have made efforts in its preservation by republishing this again in a modern format book for present and future generations. This whole book has been reformatted, retyped and designed. These books are not made of scanned copies of their original work and hence the text is clear and readable.