%0 Journal Article %T Inequalities for mixed $p$-affine surface area %A Elisabeth Werner %A Deping Ye %J Mathematics %D 2008 %I arXiv %R 10.1007/s00208-009-0453-2 %X We prove new Alexandrov-Fenchel type inequalities and new affine isoperimetric inequalities for mixed $p$-affine surface areas. We introduce a new class of bodies, the illumination surface bodies, and establish some of their properties. We show, for instance, that they are not necessarily convex. We give geometric interpretations of $L_p$ affine surface areas, mixed $p$-affine surface areas and other functionals via these bodies. The surprising new element is that not necessarily convex bodies provide the tool for these interpretations. %U http://arxiv.org/abs/0812.4550v1