1. Upper bounds for the ground state energy of the Laplacian with zero magnetic field on planar domains

   • Bruno Colbois
   • Alessandro Savo

   OriginalPaper Open access 15 March 2021 Pages: 1 - 18

   

2. Sharp upper diameter bounds for compact shrinking Ricci solitons

   • Jia-Yong Wu

   OriginalPaper 15 March 2021 Pages: 19 - 32

3. Holomorphic maps into Grassmann manifolds (harmonic maps into Grassmann manifolds III)

   • Yasuyuki Nagatomo

   OriginalPaper 22 March 2021 Pages: 33 - 63

4. Typical field lines of Beltrami flows and boundary field line behaviour of Beltrami flows on simply connected, compact, smooth manifolds with boundary

   • Wadim Gerner

   OriginalPaper Open access 12 April 2021 Pages: 65 - 82

5. The classification of flat Riemannian metrics on the plane

   • Vincent E. Coll Jr.
   • Lee B. Whitt

   OriginalPaper 19 April 2021 Pages: 83 - 96

   

6. Existence of a complete holomorphic vector field via the Kähler–Einstein metric

   • Young-Jun Choi
   • Kang-Hyurk Lee

   OriginalPaper 26 April 2021 Pages: 97 - 109

7. Homogeneous non-degenerate 3-(α,δ)-Sasaki manifolds and submersions over quaternionic Kähler spaces

   • Ilka Agricola
   • Giulia Dileo
   • Leander Stecker

   OriginalPaper Open access 26 April 2021 Pages: 111 - 141

   

8. The contact mappings of a flat (2,3,5)-distribution

   • Alex D. Austin

   OriginalPaper 26 April 2021 Pages: 143 - 156

9. Self-intersections of closed parametrized minimal surfaces in generic Riemannian manifolds

   • John Douglas Moore

   OriginalPaper Open access 27 April 2021 Pages: 157 - 165

10. On the non-existence of common submanifolds of Kähler manifolds and complex space forms

    • Xiaoliang Cheng
    • Yihong Hao

    OriginalPaper 10 May 2021 Pages: 167 - 180