AbstractThe object of this communication is to complement theorems on the differentiability of an infimum, a supremum, a min‐max or a saddle point with respect to a parametert≥ 0 att= 0. This technical result gives an interesting description of the non‐differentiability in some problems with a non‐differentiable cost function subject to a state equation. An example is given along with generalizations of the conclusions of the above t
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