From the reviews: "The origin of this book is the conference Explanation and Proof in Mathematics: Philosophical and Educational Perspectives (Essen, 2006) and it reflects different views from three fields: mathematics educators, philosophy of mathematics and history of mathematics. ... The authors and editors made a fine job providing a useful resource for all interested in proofs and proving in mathematical education."--- (Claudi Alsina, Zentralblatt MATH, Vol. 1196, 2010)