1.
The Kepler Conjecture: The Hales-Ferguson Proof
by Hales, Thomas C., Ferguson,...
ISBN: 9781461411284
List Price: $74.95
2.
Ultimate Challenge : The $3x+1$ Problem
by Lagarias, Jeffrey C.
ISBN: 9780821849408
List Price: $59.00
OUT OF STOCK
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Ultimate Challenge : The $3x+1$ Problem
by Jeffrey C. Lagarias
ISBN: 9781470472894
List Price: $66.00