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I think it is helpful to keep a hoard of helpful sites pertaining to unsolved problems and pay a regular/casual visit to them. Please when you answer, add a comment on the content of the site for faster surfing.

Thanks in advance.

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I've hit this with the wiki hammer. – Scott Morrison May 15 '10 at 15:48
up vote 2 down vote accepted


The AIM Problem Lists are part of the Bibliographic Knowledge Network (BKN) project funded by a Cyber Enabled Discovery and Innovation (CDI) grant from the National Science Foundation. Major partners in the project are UC Berkeley, Harvard, Stanford, and AIM.

It currently contains four large categories:

  • Braid Groups, Clusters, and Free Probability
  • Low Eigenvalues of Laplace and Schroedinger Operators
  • Equivalences to the Riemann Hypothesis
  • The Riemann Hypothesis and related problems
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