We give an example of a positive operator B in a Krein space with the following properties: the nonzero spectrum of B consists of isolated simple eigenvalues, the norms of the orthogonal spectral projections in the Krein space onto the eigenspaces of B are uniformly bounded and the point ∞ is a singular critical point of B.
- Krein space,
- Definitizable operator,
- Critical point
Available at: http://works.bepress.com/branko_curgus/38/