Ltd. has sold 24,799 copies of the Japanese version of Don's "Calculus By
and For Young People (ages 7, yes 7 and up)", from Aug. 20, 1998 (first day
in bookstores)-Dec. 31, 2003 (5 1/3 years)!!
CD-ROM with Don's worksheet book
in Japanese and English was published by Takimoto
Hiroshi in 1999. Don
now has his worksheet book on a CD-ROM in English (ISBN 0962167479).
Don now has his worksheet book on a CD-ROM in English (ISBN 0962167479).
Kodansha Ltd. also published Don's book "Changing Shapes With Matrices", co-authored and translated by Ms. Noriko Arai. It was in bookstores in Japan on April 20, 2001 and sold 7,181 copies in the 1 year, 8 months!