Performance in Greek and Commentary by Evangelos Spandagos .
 The content of this book is based on the conclusions of three tutorials, which were organized by the author at the Universities of Kiel and Marburg in the years 1924, 1925 and 1926. The topics were respectively:
 a) The asymmetry in the School of Kroton - Eudoxus .
 b) E and in books of Euclid 's "Elements".
 c) The i'th book of "Elements".