  Motivated by the Turaev-Viro invariant of 3-manifolds, we construct a formal
topological invariant of closed, oriented 3-manifolds involving spherical
tetrahedra as an application of the asymptotic formula of 6j symbols for the
Quantum Enveloping Algebra of sl(2). This invariant can be considered as a
spherical version of a formal invariant of Ponzano-Regge and Korepanov defined
via Euclidean tetrahedra.
