**List of unsolved problems in mathematics - Wikipedia**
https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics

Since the Renaissance, every century has seen the solution of more mathematical problems than the century before, yet many mathematical problems, both major and minor, still remain unsolved. These unsolved problems occur in multiple domains, including physics, computer science, algebra, analysis, combinatorics, algebraic, differential, discrete and Euclidean geometries, graph, group, model ...

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