Strong uniqueness of best approximations in an abstract \(L_ 1\) space
If X is a Banach space \(L_ 1(S,\Sigma,\mu)\) when (S,\(\Sigma\),\(\mu)\) is a positive measure space or, equivalently, if X is an abstract \(L_ 1\) space, and M is a finite dimensional subspace of X then the set of elements of X which have a strongly unique best approximation in M is dense in the set of elements which have a unique best approximation in M.
scientific article; zbMATH DE number 4105542