Symmetry in de Branges almost Pontryagin spaces

Winkler, Henrik GND; Woracek, Harald GND

In many examples of de Branges spaces symmetry appears naturally. Pres- ence of symmetry gives rise to a decomposition of the space into two parts, the ‘even’ and the ‘odd’ part, which themselves can be regarded as de Branges spaces. The converse question is to decide whether a given space is the ‘even’ part or the ‘odd’ part of some symmetric space, and, if yes, to describe the totality of all such symmetric spaces. We con- sider this question in an indefinite (almost Pontryagin space) setting, and give a complete answer. Interestingly, it turns out that the answers for the ‘even’ and ‘odd’ cases read quite differently; the latter is significantly more complex.

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Winkler, Henrik / Woracek, Harald: Symmetry in de Branges almost Pontryagin spaces. 2013.

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