%0 Journal Article %T On the Capacity of Gaussian Relay Channels %A Shao-Lun Huang %A Ming-Yang Chen %A Kwang-Cheng Chen %A John M. Cioffi %J Mathematics %D 2008 %I arXiv %X This paper has been withdrawn due to that the same conclusion has been proposed before. %U http://arxiv.org/abs/0806.0903v2