Nagano, Koichi

1. Geodesically complete spaces with an upper curvature bound
   2018/04/14 by Alexander Lytchak, Lytchak, Alexander, Koichi Nagano +1 · 3 citations
   Mathematics · #Advanced Topology and Set Theory #Homotopy and Cohomology in Algebraic Topology #Advanced Banach Space Theory
2. Fixed point sets of parabolic isometries of CAT(0)-spaces
   2004/08/25 by Koji Fujiwara, Fujiwara, Koji, Koichi Nagano +3 · 1 citation
   Mathematics · #53C20 #Differential Geometry (math.DG) #FOS: Mathematics #Geometric Analysis and Curvature Flows #Geometric and Algebraic Topology #Mathematical Dynamics and Fractals #Metric Geometry (math.MG) #math.DG #math.MG #msc:53C20
3. Topological regularity of spaces with an upper curvature bound
   2018/09/17 by Alexander Lytchak, Koichi Nagano, Lytchak, Alexander +1 · 1 citation
   Mathematics · #53C20 #53C23 #57P05 #Advanced Operator Algebra Research #Differential Geometry (math.DG) #FOS: Mathematics #Geometric Analysis and Curvature Flows #Homotopy and Cohomology in Algebraic Topology #Metric Geometry (math.MG)
4. CAT(0) 4-manifolds are Euclidean
   2021/09/20 by Lytchak, Alexander, Nagano, Koichi, Stadler, Stephan · 1 citation
   #51H20 #51K10 #53C23 #54F65 #57N13 #Differential Geometry (math.DG) #FOS: Mathematics #Geometric Topology (math.GT) #Metric Geometry (math.MG)