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Graph Theory, Mathematics, Puzzles and Fun Stuff !!

I posted my favorite open problem (is every tree graceful ?) on the open problem garden. There are many more interesting open problems on this site.

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- theory (9)
- graph theory (7)
- puzzles (6)
- open problems (5)
- conferences (4)
- mathematics (3)
- books (2)
- miscellaneous (2)

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