> | ## 7.7 Non-commutative libraries The content of libraries, created for non-commutative extensions of SINGULAR like PLURAL and LETTERPLACE is described in the following subsections. Use the `LIB` command for loading of single libraries. Note: For any computation in PLURAL, the monomial ordering must be a global ordering. See also jacobson_lib for the diagonalization of matrices over Ore Euclidean domains.
> 7.7.1 bimodules_lib |  | Tools for handling bimodules
> 7.7.2 bfun_lib |  | Algorithms for b-functions and Bernstein-Sato polynomial
> 7.7.3 central_lib |  | Computation of centralizer and center in GR-algebras
> 7.7.4 dmod_lib |  | Fundamental algorithms for algebraic D-modules
> 7.7.5 dmodapp_lib |  | Applications of algebraic D-modules
> 7.7.6 dmodvar_lib |  | Algebraic D-modules and Bernstein-Sato polynomial for varieties
> 7.7.7 fpadim_lib |  | Algorithms for quotient algebras in the letterplace case
> 7.7.8 freegb_lib |  | Two-sided Groebner bases in free algebras via Letterplace
> 7.7.9 involut_lib |  | Computations and operations with involutions
> 7.7.10 gkdim_lib |  | Computation of the Gelfand-Kirillov dimension of modules
> 7.7.11 ncalg_lib |  | Definitions of important G- and GR-algebras
> 7.7.12 ncdecomp_lib |  | Algorithmic decomposition of a module with central characters
> 7.7.13 ncfactor_lib |  | Tools for factorization in some noncommutative algebras
> 7.7.14 ncpreim_lib |  | Non-commutative elimination and preimage computations
> 7.7.15 nctools_lib |  | General tools for noncommutative algebras
> 7.7.16 perron_lib |  | Method of Perron to compute algebraic dependence
> 7.7.17 qmatrix_lib |  | Quantum matrices, quantum minors and symmetric groups
> 7.7.18 purityfiltration_lib |  | purity filtration of a given module
> 7.7.19 nchomolog_lib |  | Noncommutative Homological Algebra
> 7.7.20 ratgb_lib |  | Groebner bases in Ore localizations of noncommutative G-algebras
> 7.7.21 dmodloc_lib |  | Localization of algebraic D-modules

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