Korovkin results and Frobenius optimal approximants for infinite dimensional bounded linear operators
Korovkin type theorem and iterates of certain positive linear operators
Korovkin type theorem for iterates of certain positive linear operators
Krein-Langer factorization and related topics in the slice hyperholomorphic setting
Kreps-Yan theorem for Banach ideal spaces
Kruglov operator and operators defined by random permutations
Ky Fan inequalities