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When the objective function is a lower semicontinuous convex extended function (which happens when one minimizes problems with constraints), the subgradient algorithm no longer makes sense since we do not know whether the iterations belong to the domain of the objective function. 

Hence the idea is to approximate the objective function by its Moreau-Yosida approximation, which is differentiable, and to use the gradient algorithm applied to this approximation. We prove the convergence when both the steps of the algorithm converge to infinity and the Moreau-Yosida parameter converges to 0.</abstract>
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