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Colloquium Mathematics, Prof. Heinz Langer 

07 december 2011

Join us for coffee and tea at 13.45 p.m.



Date: Wednesday, December 7th 2011

Speaker: Prof. Heinz Langer, Institute for Analysis and Scientific Computing, Vienna University of Technology, Wenen, Oostenrijk

Room: 5161.0165 (Bernoulliborg),

Time: 14.00





Title:Sturm-Liouville operators with inner singularities and Pontryagin spaces.




We consider the differential operator dy2/dx2+ q0/(x-1)2 on an interval [0,a],a>1, q 0> 3/4.
Since x=1 is in limit point case from both sides, the classical L2-space treatment within Weyl--Titchmarsh theory leads to the orthogonal sum of 2 differential operators on the intervals[0,1) and (1,a]. But this is not always what is wanted. Sometimes it is more natural to consider this operator in a space with an indefinite inner product. In the lecture, for this example one approach to indefinite inner products is explained.






Colloquium coordinators are Prof.dr. A.C.D. van Enter (e-mail : and

Dr. A.V. Kiselev (e-mail:

Laatst gewijzigd:04 juli 2014 21:29

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