Felix Klein's lecture made Lindemann's pi and Hermite's e transcendental proof accessible and interesting to German `HS' students, and was my own first persuasi

Felix Klein's lecture made Lindemann's pi and Hermite's e transcendental proof accessible and interesting to German `HS' students, and was my own first persuasion. It was a Dover soft cover: Felix Klein's Famous Problems of Elementary Geometry, Dover, 1956.