Αλυτα προβλήματα μαθηματικών 02/01/201002/01/2010 http://mathworld.wolfram.com/topics/UnsolvedProblems.html http://en.wikipedia.org/wiki/Unsolved_problems_in_mathematics http://www.math.utah.edu/~pa/math/conjectures.html http://www.orbifold.net/default/?p=534 Related
