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We prove Korovkin-type theorems in the setting of infinite dimensional Hilbert space operators. The classical Korovkin theorem unified several approximation processes. Also, the non-commutative versions of the theorem were obtained in various settings such as Banach algebras,    $$C^{*}$$  C ∗ -algebras and lattices etc. The Korovkin-type theorem in the context of preconditioning large linear systems with Toeplitz structure can be found in the recent literature. In this article, we obtain a Korovkin-type theorem on    $$B({\mathcal {H}})$$  B ( H ) which generalizes all such results in the recent literature. As an application of this result, we obtain Korovkin-type approximation for Toeplitz operators acting on various function spaces including Bergman space    $$A^{2}({\mathbb {D}})$$  A 2 ( D ) , Fock space    $$F^{2}({\mathbb {C}})$$  F 2 ( C ) etc. These results are closely related to the preconditioning problem for operator equations with Toeplitz structure on the unit disk    $${\mathbb {D}}$$  D and on the whole complex plane    $${\mathbb {C}}$$  C . It is worthwhile to notice that so far such results are available for Toeplitz operators on circle only. This also establishes the role of Korovkin-type approximation techniques on function spaces with certain oscillation property. To address the function theoretic questions using these operator theory tools will be an interesting area of further research.

Korovkin-type theorems on $$B({\mathcal {H}})$$ and their applications to function spaces