LAPACK 3.12.0
LAPACK: Linear Algebra PACKage

Functions  
subroutine  dlaed5 (i, d, z, delta, rho, dlam) 
DLAED5 used by DSTEDC. Solves the 2by2 secular equation.  
subroutine  slaed5 (i, d, z, delta, rho, dlam) 
SLAED5 used by SSTEDC. Solves the 2by2 secular equation.  