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math.FA2018
On dual definite subspaces in Krein space
A. Kamuda, S. Kuzhel, V. Sudilovskaya
Extensions of dual definite subspaces to dual maximal definite ones are described. The concepts of dual quasi maximal subspaces and quasi basis are introduced and studied. The obta…
math.FA2018
On -frames related to maximal definite subspaces
Alan Kamuda, Sergiusz Kużel
A definition of frames in Krein spaces is proposed which extends the concept of -frames defined by J.I. Giribet et al., J. Math. Anal. Appl. (2012), 122-137. Th…