関沢 正躬

On curvatures of linear frame bundles with naturally lifted metrics 

Rend. Sem. Mat. Univ. Pol. Torino 63 283-295 2005年  

On the three-dimensional hypersurfaces with type number two in H^4 and S^4 treated in intrinsic way 

Rendiconti del Circolo Matematico di Palermo, Serie II 72(Suppl.) 107-126 2004年  

On Riemannian manifolds whose tangent sphere bundles can have nonnegative sectional curvature 

Universitatis Jagellonicae Acta Mathematica, Fasciculus XI 245-256 2002年  

Can tangent sphere bundles over Riemannian manifolds have strictly positive sectional curvature? 

Global Differential Geometry: The Mathematical Legacy of Alfred Gray, Contemporary Mathematics 288 110-118 2001年  

Curvatures of tangent sphere bundles with arbitrary constant radius 

Proceeding of the First Seminar on Geometry and Topology 148-166 2001年  

On the scalar curvature of tangent sphere bundles with arbitrary constant radius 

┣DBBull. Greek Math. Soci.(/)-┫DB 44 17-30 2000年  

Geometry of tangent sphere bundles with arbitrary constant radius 

┣DBProceedings of the Symposium Contemporary Mathematics(/)-┫DB 219-228 2000年  

Three-dimnentional conformally flat pseudo-symmetric spaces of constant type 

┣DBArchivum mathematicum(/)-┫DB(Brno) 36 279-286 2000年  

Pseudo-symunetric spaces of constant type in dimenoion three---mon-elliptic space 

Bulletin of Tokyo Gakugei University Sect. IV 50 1-28 1998年  

Pseudo-symmetric spaces of constant type in dimension three - elliptic case 

Reudiconti di Mathematica, Serie Vll 17 477-512 1997年  

Riemannian 3-manifolds with c-conullity two 

Bollenttino U. M. I. (7)11-B 161-184 1997年  

Three-dimensional Riemannian manifolds of c-conullity two 

Chapter 11 of the book ``Riemannian manifolds of conullity two" by E.Boeckx, O.Kowalski, and L.Vanhecke 219-250 1996年  

Local isometry classes of Reiwmanmian 3-manifolds with constant Ricci eigenvalues ρ₁=ρ₂≠ρ₃>O 

Archivum mathematicum 32 137-145 1996年  

Symmetries which preserve the characteristic vector field of K-contact manifolds 

Note di Matematica 13(2) 229-236 1993年  

Natural transformations of vector fields on manifolds to vector fields on tangent bundles 

Tsukuba J. math 12 115-128 1988年  

Natural transformations of symmetric affine connections on manifolds to metrics on linear frame bundles : a classification 

Monatshefte fur Math. 105 1988年  

Natural transformations of Riemannian metrics on manifolds to metrics on tangent bundles-a classification- 

Bulletin Tokyo Gakugei Univ. 40 - 1988年  

Natural transformations of Riemanuian metrics on manifolds to metrics on linear frame bundles-a classification 

Differential geometry and its Applications, D. Reidel Publ. 149-178 - 1987年