%0 Journal Article %T Comments on duality-symmetric theories %A Xavier Bekaert %A Sorin Cucu %J Physics %D 2001 %I arXiv %R 10.1002/1521-3978(200209)50:8/9<831::AID-PROP831>3.0.CO;2-6 %X We briefly review the basics of electric-magnetic duality symmetry and their geometric interpretation in the M-theory context. Then we recall some no-go theorems that prevent a simple extension of the duality symmetry to non-Abelian gauge theories. %U http://arxiv.org/abs/hep-th/0111215v1