The late Arnold, a Russian mathematician, offers lectures and problems in math aimed at younger students, from age five to high school. He discusses continued fractions; the geometry of complex numbers, quaternions, and spins; and Euler groups and the arithmetic of geometric progressions. He ends with 79 problems for students ages five to 15, with solutions. Each chapter ends with comments from the editor. Annotation ©2016 Ringgold, Inc., Portland, OR (protoview.com)

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