Re:Math Problems for children from 5 to 15 (2004) [pdf]
by harperlee on Monday July 19, 2021 @04:36PM
(#27887010)
Sure, but the actual document states that
The book is addressed to school and university students, teachers, parents – to everybody who considers the thinking culture an essential part of the personality development.
The book is addressed to school and university students, teachers, parents – to everybody who considers the thinking culture an essential part of the personality development.
Not sure where the 5yold number came from.