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- Helmholtz Institute JenaDE407 papers
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136 papers · 1 filter
On projective equivalence and pointwise projective relation of Randers metrics
Vladimir S. Matveev
We correct a mistake in Shen Yibing, Yu Yaoyong, On Projectively Related Randers Metrics, International Journal of Mathematics 19}(2008), no. 5, 503--520, and prove the natural gen…
XMM-Newton observation of PSR B2224+65 and its jet
C. Y. Hui, R. H. H. Huang, L. Trepl +4
We have investigated the pulsar PSR B2224+65 and its X-ray jet with XMM-Newton. Apart from the long X-ray jet which is almost perpendicular to the direction of proper motion, a put…
Can we make a Finsler metric complete by a trivial projective change?
Vladimir S. Matveev
A trivial projective change of a Finsler metric is the Finsler metric . I explain when it is possible to make a given Finsler metric both forward and backward complete…
Sparsity-based single-shot sub-wavelength coherent diffractive imaging
A. Szameit, Y. Shechtman, E. Osherovich +13
We present the experimental reconstruction of sub-wavelength features from the far-field intensity of sparse optical objects: sparsity-based sub-wavelength imaging combined with ph…
Intractability of the Minimum-Flip Supertree problem and its variants
Sebastian Böcker, Quang Bao Anh Bui, Francois Nicolas +1
Computing supertrees is a central problem in phylogenetics. The supertree method that is by far the most widely used today was introduced in 1992 and is called Matrix Representatio…
Weak closure and Oliver's p-group conjecture
David J. Green, Justin Lynd
To date almost all verifications of Oliver's p-group conjecture have proceeded by verifying a stronger conjecture about weakly closed quadratic subgroups. We construct a group of o…