## 7.11 Release Notes (letterplace)

# NEWS in SINGULAR:LETTERPLACE 4.4.1

## News for SINGULAR:LETTERPLACE version 4.4.1

New functions:

- added support for free bimodules of a fixed rank ( freeAlgebra (letterplace), ncgen)
- several types of monomial orderings become available, among them three types of elimination orderings
- twostd ( twostd (letterplace)), reduce ( reduce (letterplace)) and other functions support subbimodules
- syz ( syz (letterplace)), lift ( lift (letterplace)), liftstd ( liftstd (letterplace)), modulo ( modulo (letterplace)) implemented
- bracket ( bracket) and maxideal ( maxideal) work in Letterplace
- the options `redSB`, `redTail` are effective for computations related to Groebner bases
- the options `prot`, `mem` are effective for the whole LETTERPLACE subsystem

New libraries:

- fpaprops_lib: Algorithms for properties of quotient algebras ( fpaprops_lib)
- ncHilb.lib: Hilbert functions for non-commutative algebras ( ncHilb_lib)

Changed libraries:

- fpadim.lib: Vector space dimension, basis and Hilbert series for finitely presented algebras ( fpadim_lib), numerous enhancements, partially implemented in the kernel
- freegb.lib: Main initialization and convenience tools ( freegb_lib)

Changes in the kernel/build system:

- SINGULAR:LETTERPLACE is available as the dynamical module
- adaptions/functions for `Singular.jl`(https://github.com/oscar-system/Singular.jl)

## News for SINGULAR:LETTERPLACE version 4-1-2

New libraries:

- fpalgebras.lib: Generation of various algebras in the letterplace case ( fpalgebras_lib)
- ncrat.lib: Manipulating non-commutative rational functions ( ncrat_lib)

Changed/updated libraries:

- freegb.lib: lpDivision, lpPrint ( freegb_lib)
- fpadim.lib ( fpadim_lib)
- ncfactor.lib ( ncfactor_lib) is available for Letterplace rings

Changes in the kernel/build system:

- code for free algebras (letterplace rings) rewritten (using now the standard `+,-,*,^,std`,...) ( LETTERPLACE)
- new command `rightstd` ( rightstd (letterplace))
- extended `twostd` to LETTERPLACE ( twostd (letterplace), twostd (plural))

User manual for Singular version 4.4.1, 2025, generated by texi2html.