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Science, engineering, and mathematics — biology, chemistry, physics, astronomy, earth sciences, social sciences, and technology research. A curated gateway to academic and professional scientific resources.
57129 resources
Elementary unsolved problems in mathematics, listed at the MathPages archive.
In various subjects, compiled by Torsten Sillke.
A list of unsolved problems published by MathPro Press during 1995.
A collection of unsolved math problems anyone can contribute to.
A list compiled by Eric Weisstein in MathWorld.