Analysis of spatio-temporally sparse optimal control problems of semilinear parabolic equations
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Optimal control problems with semilinear parabolic state equations are considered. The objective features one out of three different terms promoting various spatio-Temporal sparsity patterns of the control variable. For each problem, first-order necessary optimality conditions, as well as secondorder necessary and sufficient optimality conditions are proved. The analysis includes the case in which the objective does not contain the squared norm of the control.