| GaudiGSL | Helper class to get (static) access to Gaudi GSL Service General users are not supposed to use it |
| GslError | Helper class to represent GSL errors |
| IEqSolver | Interface file for multidimensional root-finding (solving nonlinear system with n equations in n unknowns) |
| IFuncMinimum | Interface file to find minimum of the function and compute covariance matrix (matrix of error) |
| IGslErrorHandler | The abstract interface for arbitrary GSL error handler |
| IGslSvc | The abstract interface to "deal" with GNU Scientific Library (GLS) The main task is the error handling |
