source: git/doc/NEWS.texi @ 49648a

@comment -*-texinfo-*-
@comment $Id: NEWS.texi,v 1.49 2005-05-23 15:35:37 levandov Exp $
@comment this file contains the News about Singular versions
@comment Unix
@ifclear VERSION
@include version.texi
@end ifclear

@majorheading NEWS in SINGULAR @value{VERSION}

@ifclear singularmanual
@macro nref{what}
\what\
@end macro
@end ifclear

@ifset singularmanual
@macro nref{what}
@ref{\what\}
@end macro
@end ifset

The current version @value{VERSION} is a pre-release to the new
release series version 3-0. 

Singular version 3 has a greater functionality and an improved architecture.
Major new features are:
@itemize
@item
@nref{Dynamic modules}
@item
non-commutative extension @nref{PLURAL}
@item
name spaces (@nref{package})
@item
easy manipulation of rings (@nref{ringlist})
@item
improved speed of maps (@nref{subst}, @nref{map})
@item
variant of Faugeres F4: @nref{slimgb}.
@item
improved factorization (integration of NTL, factorization over algebraic extensions,
zeroset.lib)
@item
improved gcd of polynomials (including bug fixes)
@item
ports to more architectures including automatic building from source (fink on Mac, ebuild on Gentoo)
@item
more help browser supported, user extendable (help.cnf)
@item
many bugs fixed
@end itemize
Besides theses internal changes, Singular version 3 offers many new
features and functionalities (which were partly already incorporated in
the 2-0 series).

@heading Factorizing algorithms revisited
Starting with version 2-0-4, we use NTL (of Victor Shoup) for factoring
univariate polynomials. The multivariate factoring code in libfac/factory
does now also work over algebraic extension fields.

@heading New @sc{Singular} libraries

Reorganisation of libraries into "Categories".
@table @asis
@item @nref{control_lib} 
algebraic analysis tools for System and Control Theory
@item @nref{mregular_lib}    
procedures for computing the Castelnuovo-Mumford regularity
@item @nref{mprimdec_lib}    
procedures for primary decomposition of modules
@item @nref{gmspoly_lib}, @nref{gmssing_lib}   
procedures for the Gauss-Manin connection of a singularity
@item @nref{resol_lib}
resolution of singularities
@item @nref{rootsmr_lib}
counting the number of real roots
@item @nref{sheafcoh_lib}
computing cohomology of sheaves and Tate resolution
@item @nref{signcond_lib}
computing realizable sign conditions
@item @nref{rootsur_lib}
counting number of real roots of univariate polynomial
@item @nref{grwalk_lib}
Groebner and Pertubation walk
@end table

@heading Changes in @sc{Singular} libraries
Many procedures were moved into different libraries,
the documentation of libraries was generally improved.

All procedures which used to change the current ring return now
the newly created ring.
@table @asis
@end table

@heading New @sc{Singular} functions

@table @asis
@item @nref{ringlist}
manipulation of rings
@item @nref{slimgb}
variant of the F4 algorithm to compute Groebner bases
@item @nref{exportto}
@item @nref{importfrom}

@item @nref{frwalk}
fractal walk to change monomial orderings
@end table

@heading @sc{Singular} functions whose syntax/semantics has changed
@table @asis
@item @nref{degree}
outputs degree and dimension instead of returning an int
@item @nref{attrib}
new attribute: @code{rowShift}
@end table

@heading Noncommutative Extension @sc{Plural}

Starting with version 3-0-0, @sc{Singular} features a
noncommutative extension @sc{Plural}. It allows to 
set and to compute within noncommutative algebras
 with PBW basis. Among available algorithms are Groebner
bases for left modules, syzygies and resolutions.

Together with @sc{Plural} come the following libraries:

@table @asis
@item @nref{center_lib}
computes generators of the center and centralizer subalgebras up
to a given degree resp. up to a given number of generators
@item @nref{involution_lib}
determines linear antiautomorphisms (involutions) and automorphisms
@item @nref{gkdim_lib}
computes a Gel'fand-Kirillov dimension for modules
@item @nref{ncalg_lib}
includes ready-to-use funtions for defining many important
 noncommutative algebras
@item @nref{ncdecomp_lib}
computes a decomposition of module by its central characters
@item @nref{ncalg_lib}, @nref{nctools_lib}
contain numerous useful tools for noncommutative algebras
@item @nref{qmatrix_lib}
procedures, related to quantum matrices and minors
@end table

@heading Internal Changes
@table @asis
@item new mapping code
@c @item non-commutative extension (Plural)
@item factory revisited
(gcd, factorizing polynomial over algebraic extension fields,...)
@end table

@heading Porting

@itemize @bullet
@item Singular is available for ix86-Linux, HPUX_10,
SunOS-5, IRIX-6, ix86-Win (runs on Windows 95/98/NT4/2000/XP),
FreeBSD, MacOS X, DecAlpha-Linux, x86_64-Linux (AMD64/Opteron/EM64T),
IA64-Linux
@end itemize