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Math Open Problems Open Problems on Geometry Open Problems in Number Theory Open Problems in Dynamical Systems Goldbach Conjecture Riemann Hypothesis ABC Conjecture Collatz Problem Hilbert's 16th problem Poincare Conjecture Catalan's Conjecture Carmichael and Lucas-Carmichael Numbers Ramanaujan Conjectures Solutions for Diophantine Equations Hodge Conjecture Packing Unit Squares in Simple Polygon Birch and Swinnerton Dyer Conjecture Totient Function Conjectures Euler Mascheroni Constants P vs NP Problem Partitioning Permutations