## Answer

###### Wiki User

###### 04/14/2010

There are some questions in the world that are mathrelated and still unsolved.

Which of these that are "hardest" to solve is virtually impossible to decide.

For a mathquestion to be hard, it must not be impossible.

*In order to distinguish between hardest and impossible, one
need to know an answer.*

Often a mathproblem can be very hard to solve but even virtually impossible to prove that it is solved correctly.

**One of the really hard mathproblems is Fermat's last
theorem.**

Fermat's Last Theorem states that

### xn + yn = zn

has no non-zero integer solutions for *x*, *y* and
*z* when *n* > 2.

We were well into 1995 before there was a solution or a proof for this theorem.

Pierre Fermat died in 1665, so the theorem was without proof for 330 years.

It can however be disputed wether this is a math question.

I would think that to calculate the length of ALL roads combined in the world is a real challenge.

To calculate the individual movement of atoms in a microprosessor would be virtually impossible but even for ONE single transistor this is a huge task that with powerfull computers takes hours to complete.

Regards.