The conjecture is still open. I'm not sure what Cahit's arxiv preprint (http://arxiv.org/abs/math/0408363) contains, but it certainly does not contain a proof. - Manfred Scheucher

## Conjecture still open

The conjecture is still open. I'm not sure what Cahit's arxiv preprint (http://arxiv.org/abs/math/0408363) contains, but it certainly does not contain a proof. - Manfred Scheucher