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Orthogonally spherical objects and spherical fibrations
Orthogonally spherical objects spherical fibrations
2010/11/9
We introduce a relative version of the spherical objects of Seidel and Thomas. Define an object E in the derived category D(Z x X) to be spherical over Z if the corresponding functor from D(Z) to D(X)...
On the volume formulas for a spherical tetrahedron
the volume formulas spherical tetrahedron
2010/11/18
The present paper gives two concrete formulas for the volume of an arbitrary spherical tetrahedron, which is in a 3-dimensional spherical space of constant curvature $+1$. One formula is given in term...