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How to differentiate the projection on a convex set in Hilbert space. Some applications to variational inequalities. (English) Zbl 0387.46022

MSC:
46C99 Inner product spaces and their generalizations, Hilbert spaces
46G05 Derivatives of functions in infinite-dimensional spaces
49J40 Variational inequalities
35A15 Variational methods applied to PDEs
41A65 Abstract approximation theory (approximation in normed linear spaces and other abstract spaces)
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