In 1966, Chern asked which compact orientable manifolds carry a Riemannian metric and a vector field which is parallel under this metric. An earlier paper answered this without assuming orientability.

The aim of this journal is to publish original contributions to pure and applied mathematics. All papers are refereed. Tsukuba Journal of Mathematics is a continuation of Science Reports of the Tokyo ...

November 9, 2021 -- NSITEXE, Inc. (headquartered in Minato Ward, Tokyo, Japan; President and CEO: Yukihide Niimi; hereinafter “NSITEXE”) announced that the DR1000C, a RISC-V based parallel processor ...