Lorentzian Isothermic Surfaces in $\r^n_j$

M.A. Magid
2005 Rocky Mountain Journal of Mathematics  
If a time-like surface in R n j is isothermic then there is another, uniquely determined surface which is either anti-conformal or conformal and sign-reversing with the same Gauss map. The choice of mapping depends on whether the shape operator is diagonalizable over R or C.
doi:10.1216/rmjm/1181069750 fatcat:weoia2b3ynakrgjkbkiezbpxfi