ar X iv : 0 71 1 . 48 59 v 2 [ m at h . A T ] 1 9 Fe b 20 08 Higher string topology operations

ar X iv : 0 71 0 . 20 07 v 2 [ m at h - ph ] 1 9 Fe b 20 08 The wave equation on singular space - times

We prove local unique solvability of the wave equation for a large class of weakly singular, locally bounded space-time metrics in a suitable space of generalised functions.

ar X iv : 0 80 2 . 25 80 v 1 [ m at h . G T ] 1 9 Fe b 20 08 3 - Dimensional Schlaefli Formula and Its Generalization

Several identities similar to the Schlaefli formula are established for tetrahedra in a space of constant curvature.

ar X iv : 0 80 1 . 48 21 v 2 [ he p - ph ] 2 8 Fe b 20 08 X ( 1835 ) and η ( 1760 ) observed by BES Collaboration

ar X iv : 0 80 2 . 38 43 v 1 [ m at h . N T ] 2 6 Fe b 20 08 COMPUTATIONAL CLASS FIELD THEORY

Class field theory furnishes an intrinsic description of the abelian extensions of a number field that is in many cases not of an immediate algorithmic nature. We outline the algorithms available for the explicit computation of such extensions.

ar X iv : 0 90 2 . 39 12 v 1 [ m at h . G R ] 2 3 Fe b 20 09 Brent Everitt The Combinatorial Topology