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- Nihat Ay, Andreas Knauf
- Kybernetika
- 2006

Stochastic interdependence of a probablility distribution on a product space is measured by its Kullback-Leibler distance from the exponential family of product distributions (called multi-information). Here we investigate low-dimensional exponential families that contain the maximizers of stochastic interdependence in their closure. Based on a detailed… (More)

- Andreas Knauf
- 1993

We present numerical and analytical evidence for a rst-order phase transition of the ferromagnetic spin chain with partition function Z() = (? 1)==() at the inverse temperature cr = 2. In a recent paper 6] we established a link between analytic number theory and classical statistical mechanics by interpreting the quotient Z(s) = (s ? 1)==(s) of Riemann zeta… (More)

- Firas W Obeidat, Reinhold A Lang, +5 authors Thomas P Hüttl
- Surgical endoscopy
- 2011

BACKGROUND
Treatment of type 4 hiatal hernia using a minimally invasive approach is challenging and requires good familiarity with this technique.
METHODS
From October 1992 to August 2010, 40 patients with a median age of 68 years underwent laparoscopic anterior hemifundoplication surgery for upside-down stomach and were included in our prospective study.… (More)

We analyze the Farey spin chain, a one dimensional spin system with effective interaction decaying like the squared inverse distance. Using a polymer model technique, we show that when the temperature is decreased below the (single) critical temperature T c = 1 2 , the magnetization jumps from zero to one.

- Andreas Knauf
- 1993

The quotient (s ? 1)==(s) of Riemann zeta functions is shown to be the partition function of a ferromagnetic spin chain for inverse temperature s.

We consider motion in a periodic potential in a classical, quantum , and semiclassical context. Various results on the distribution of asymptotic velocities are proven.

- Andreas Knauf
- 2008

We consider the classical three-dimensional motion in a potential which is the sum of n attracting or repelling Coulombic potentials. Assuming a non-collinear configuration of the n centres, we find a universal behaviour for all energies E above a positive threshold. Whereas for n = 1 there are no bounded orbits, and for n = 2 there is just one closed… (More)

- Andreas Knauf
- 1998

We shortly review recent work interpreting the quotient (s ? 1)==(s) of Riemann zeta functions as a dynamical zeta function. The corresponding interaction function (Fourier transform of the energy) has been shown to be ferromagnetic, i.e. positive.

We study a curve of Gibbsian families of complex 3 × 3-matrices and point out new features, absent in commutative finite-dimensional algebras: a discontinuous maximum-entropy inference, a discontinuous entropy distance and non-exposed faces of the mean value set. We analyze these problems from various aspects including convex geometry, topology and… (More)