TY - GEN A1 - Herzog, Roland A1 - Obermeier, Johannes A1 - Wachsmuth, Gerd T1 - Annular and sectorial sparsity in optimal control of elliptic equations T2 - Computational Optimization and Applications (COAP) N2 - Optimal control problems are considered with linear elliptic equations in polar coordinates. The objective contains L¹-type norms, which promote sparse optimal controls. The particular iterated structure of these norms gives rise to either annular or sectorial sparsity patterns. Optimality conditions and numerical solution approaches are developed. KW - Directional sparsity KW - Polar coordinates KW - Coordinate transformation Y1 - 2015 U6 - https://doi.org/10.1007/s10589-014-9721-5 SN - 0926-6003 SN - 1573-2894 VL - 62 IS - 1 SP - 157 EP - 180 ER -