@article{KellerPinchoverPogorzelski2018,
  author    = {Keller, Matthias and Pinchover, Yehuda and Pogorzelski, Felix},
  title     = {An improved discrete hardy inequality},
  series = {The American mathematical monthly : an official publication of the Mathematical Association of America},
  volume    = {125},
  journal   = {The American mathematical monthly : an official publication of the Mathematical Association of America},
  number    = {4},
  publisher = {Taylor \& Francis Group},
  address   = {Philadelphia},
  issn      = {0002-9890},
  doi       = {10.1080/00029890.2018.1420995},
  pages     = {347 -- 350},
  year      = {2018},
  abstract  = {In this note, we prove an improvement of the classical discrete Hardy inequality. Our improved Hardy-type inequality holds with a weight w which is strictly greater than the classical Hardy weight w(H)(n) : 1/(2n)(2), where N.},
  language  = {en}
}
@article{KellerPinchoverPogorzelski2018,
  author    = {Keller, Matthias and Pinchover, Yehuda and Pogorzelski, Felix},
  title     = {Optimal Hardy inequalities for Schrodinger operators on graphs},
  series = {Communications in mathematical physics},
  volume    = {358},
  journal   = {Communications in mathematical physics},
  number    = {2},
  publisher = {Springer},
  address   = {New York},
  issn      = {0010-3616},
  doi       = {10.1007/s00220-018-3107-y},
  pages     = {767 -- 790},
  year      = {2018},
  abstract  = {For a given subcritical discrete Schrodinger operator H on a weighted infinite graph X, we construct a Hardy-weight w which is optimal in the following sense. The operator H - lambda w is subcritical in X for all lambda < 1, null-critical in X for lambda = 1, and supercritical near any neighborhood of infinity in X for any lambda > 1. Our results rely on a criticality theory for Schrodinger operators on general weighted graphs.},
  language  = {en}
}
@article{GueneysuKeller2018,
  author    = {G{\"u}neysu, Batu and Keller, Matthias},
  title     = {Scattering the Geometry of Weighted Graphs},
  series = {Mathematical physics, analysis and geometry : an international journal devoted to the theory and applications of analysis and geometry to physics},
  volume    = {21},
  journal   = {Mathematical physics, analysis and geometry : an international journal devoted to the theory and applications of analysis and geometry to physics},
  number    = {3},
  publisher = {Springer},
  address   = {Dordrecht},
  issn      = {1385-0172},
  doi       = {10.1007/s11040-018-9285-1},
  pages     = {15},
  year      = {2018},
  abstract  = {Given two weighted graphs (X, b(k), m(k)), k = 1, 2 with b(1) similar to b(2) and m(1) similar to m(2), we prove a weighted L-1-criterion for the existence and completeness of the wave operators W-+/- (H-2, H-1, I-1,I-2), where H-k denotes the natural Laplacian in l(2)(X, m(k)) w.r.t. (X, b(k), m(k)) and I-1,I-2 the trivial identification of l(2)(X, m(1)) with l(2) (X, m(2)). In particular, this entails a general criterion for the absolutely continuous spectra of H-1 and H-2 to be equal.},
  language  = {en}
}
@article{KellerSchwarz2018,
  author    = {Keller, Matthias and Schwarz, Michael},
  title     = {The Kazdan-Warner equation on canonically compactifiable graphs},
  series = {Calculus of variations and partial differential equations},
  volume    = {57},
  journal   = {Calculus of variations and partial differential equations},
  number    = {2},
  publisher = {Springer},
  address   = {Heidelberg},
  issn      = {0944-2669},
  doi       = {10.1007/s00526-018-1329-7},
  pages     = {18},
  year      = {2018},
  abstract  = {We study the Kazdan-Warner equation on canonically compactifiable graphs. These graphs are distinguished as analytic properties of Laplacians on these graphs carry a strong resemblance to Laplacians on open pre-compact manifolds.},
  language  = {en}
}