Mathematics 15 Number theory 9 Geometry 7 Combinatorial analysis 5 History 5 Algebra 3 Calculus 3 Curves, Algebraic 3 Algebraic fields 2 Algebras, Linear 2 Functions of real variables 2 Integrals 2 Maxima and minima 2 Study and teaching 2 Algebra, Boolean 1 Algebraic geometry -- Curves -- Elliptic curves [See also 11G05, 11G07, 14Kxx] 1 Algebraic geometry -- Curves -- Special curves and curves of low genus 1 Algebraic logic 1 Algebraic number theory 1 Arithmetic 1 Calculus, Integral 1 Combinatorial enumeration problems 1 Competitions 1 Conic sections 1 Continued fractions 1 Curves, Plane 1 Diophantine analysis 1 Diophantine equations 1 Elementary problems in Euclidean geometries 1 Euclidean geometries (general) and generalizations 1