Five Simple Math Problems No One Can Solve

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From Popular Mechanics: 5 Simple Math Problems No One Can Solve. The list:

  1. The Collatz conjecture.
  2. The moving sofa problem.
  3. The perfect cuboid problem.
  4. The inscribed square problem.
  5. The happy ending problem.
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Published by John Quintanilla

I'm a Professor of Mathematics and a University Distinguished Teaching Professor at the University of North Texas. For eight years, I was co-director of Teach North Texas, UNT's program for preparing secondary teachers of mathematics and science.

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