RT Journal Article T1 Transverse Riemann-Lorentz type-changing metrics with tangent radical A1 Lafuente López, Javier A1 Aguirre Dabán, Eduardo AB Consider a smooth manifold with a smooth metric which changes bilinear type on a hypersurface Σ and whose radical line field is everywhere tangent to Σ. We describe two natural tensors on Σ and use them to describe “integrability conditions” which are similar to the Gauss–Codazzi conditions. We show that these forms control the smooth extendibility to Σ of ambient curvatures. PB Elsevier Science SN 0926-2245 YR 2006 FD 2006-03 LK https://hdl.handle.net/20.500.14352/50110 UL https://hdl.handle.net/20.500.14352/50110 LA eng DS Docta Complutense RD 9 abr 2025