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Amer ANOMALOUS CANCELLATION average number barycentric coordinates bichromatic graph blue edges blue triangle blue-empty graph cake candidate circle color columns cone conic Consider contain convergent series Daniel Pedoe denote density diagonal Dirichlet principles divergent series ellipses inscribed equal equation equilateral triangle Exercise extremal graph fact Figure formula Fubini principle geometric given harmonic series Hence infinitely inscribed in ABC ir(x isoperimetric theorem latin square least logarithmic density Math mathematical matrix midpoint ellipse midpoint triangle n-by-n square n-digit integers number of occupied number theory occupied seats orthogonal projection partial sum participants pentagon piece plane positive integers prime numbers probability problem proof Prove quadrilateral raindrops Ramsey number Ramsey's Theorem random reciprocals red triangles regions result Riemann hypothesis Ross Honsberger sequence set of integers singular pair six vertices solutions submatrix subsets Suppose tangent Theorem total number transversal triangle ABC vertex zeros