Kaltenbäck, M. (2016). Spectral theorem for definitizable normal linear operators on Krein spaces. Integral Equations and Operator Theory, 85(2), 221–243. https://doi.org/10.1007/s00020-016-2288-z
In the present note a spectral theorem for normal definitizable linear operators on Krein spaces is derived by developing a functional calculus ϕ↦ϕ(N) which is the proper analogue of ϕ↦∫ϕdE in the Hilbert space situation. This paper is the first systematical study of definitizable normal operators on Krein spaces.
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The final publication is available at Springer via <a href="https://doi.org/10.1007/s00020-016-2288-z" target="_blank">https://doi.org/10.1007/s00020-016-2288-z</a>.