Singular Manual: LETTERPLACE libraries

> | ## 7.11 LETTERPLACE libraries
> 7.11.1 fpadim_lib |  | Vector space dimension, basis and Hilbert series for finitely presented algebras (Letterplace)
> 7.11.2 fpalgebras_lib |  | Numerous algebras predefined for the Letterplace case
> 7.11.3 fpaprops_lib |  | Algorithms for properties of quotient algebras in the Letterplace case
> 7.11.4 freegb_lib |  | Two-sided Groebner bases in free algebras via Letterplace
> 7.11.5 ncHilb_lib |  | Hilbert functions for non-commutative algebras via Letterplace
> 7.11.6 ncrat_lib |  | Handling non-commutative rational functions

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