/*! \page prec Preconditioners

- \subpage BLR_Preconditioning "Block Low Rank (BLR) Preconditioning"
- \subpage HOD_Preconditioning "HODLR & Butterfly Preconditioning"
- \subpage HSS_Preconditioning "Hierarchically Semi-Separable (HSS) Preconditioning"
- \subpage Lossy_Preconditioning "Lossy/Lossless Compression Preconditioning"

*/
