Function of area of a triangle
Source: IMO Longlist 1989, Problem 105
September 18, 2008
functiongeometryanalytic geometrygeometry unsolved
Problem Statement
Let be the set of all triangles whose only points with integer coordinates (in the Cartesian coordinate system in space), in its interior or on its sides, are its three vertices, and let be the function of area of a triangle. Determine the set of values of