2 papers
math.CO2024
Ruzsa's problem on Bi-Sidon sets
János Pach, Dmitrii Zakharov
A subset of real numbers is called bi-Sidon if it is a Sidon set with respect to both addition and multiplication, i.e., if all pairwise sums and all pairwise products of eleme…
math.MG2017
Acute sets
D. Zakharov
A set of points in is acute, if any three points from this set form an acute triangle. In this note we construct an acute set in of size at least $1.6…