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  1. 10 Math Equations That Have Never Been Solved

  2. List of unsolved problems in mathematics - Wikipedia

  3. 7 of the hardest problems in mathematics that have been solved

  4. 13 World’s Hardest Math Problems | With Solutions - Engineerine

  5. 15 Hardest Math Problems In The World (Unsolved) - Nerdable

  6. 5 of the world’s toughest unsolved maths problems

  7. Millennium Prize Problems - Wikipedia

  8. 7 of the hardest math problem in the world yet to be solved

  9. Mathematicians Are Edging Close to Solving One of the World’s 7 Hardest