@article{890281,
      recid = {890281},
      author = {Alexander, Stephanie, and Kapovitch, Vitali, and Petrunin,  Anton,},
      title = {An invitation to Alexandrov geometry : CAT(0) spaces /},
      pages = {1 online resource.},
      abstract = {Aimed toward graduate students and research  mathematicians, with minimal prerequisites this book  provides a fresh take on Alexandrov geometry and explains  the importance of CAT(0) geometry in geometric group  theory. Beginning with an overview of fundamentals,  definitions, and conventions, this book quickly moves  forward to discuss the Reshetnyak gluing theorem and  applies it to the billiards problems. The Hadamard–Cartan  globalization theorem is explored and applied to construct  exotic aspherical manifolds.},
      url = {http://library.usi.edu/record/890281},
      doi = {https://doi.org/10.1007/978-3-030-05},
}