A quotation by Heinrich Tietze
The story was told that the young Dirichlet had as a constant companion all his travels, like a devout man with his prayer book, an old, worn copy of the Disquisitiones Arithmeticae of Gauss.
Quoted in G Simmons Calculus Gems (New York 1992).
JOC/EFR February 2006
The URL of this page is:
http://www-history.mcs.st-andrews.ac.uk/Quotations/Tietze.html