NEWS in SINGULAR 3-0-3
Updates for version 3-0-3
The current version 3-0-3 is stabilyzing release,
a result of a long beta test and the integration of a lot of small
fixes which were on our waiting list for integration.
It contains also a lot of new features:
-
licence changed: omalloc and MP are now (also) available under GPL;
that means that all parts of SINGULAR are licenced under GPL (resp. LGPL).
-
factory, libfac, Singular updated for gcc 4.1.x
-
kernel updated for the optional use of boost.
-
can now be built as a library.
-
new operator
a:b
gives an intvec
of length b
with constant entries a
-
new command: (chinrem): lifting via chinese remainder theorem
-
new command: (interpolation): ideal of points with given multiplicities
-
non-commutative kernel subsystem was rewritten in order to support specific algebras more efficiently.
Implemented algebras at the moment: super-commutative algebras (in particular exterior algebras).
-
std et al.: new selection strategy for reductions (option (length)).
-
reduce: new strategy for selection and normalization.
-
simplify slightly changed: does not omit zero polynomial unless
specified.
-
new library: compregb.lib (compregb_lib): comprehensive Groebner base system
-
new library: kskernel.lib (kskernel_lib): kernel of the kodaira-spencer map for irreducible plane curve singularities
-
new library: modstd.lib (modstd_lib): Groebner base computations
over the rational numbers via modular computations
-
new library: noether.lib (noether_lib): Noether normalization of an ideal(not nessecary homogeneous)
-
new library: atkins.lib (atkins_lib): the elliptic curve primality test of Atkin
-
new library: aksaka.lib (aksaka_lib): primality testing after Agrawal, Saxena, Kayal
-
new library: arcpoint.lib (arcpoint_lib): truncations of arcs at a singular point
-
new library: resgraph.lib (resgraph_lib): visualization of resolution data.
-
new library: realrad.lib (realrad_lib): computation of the real radical
over the rational numbers and extensions thereof
-
new library: hyperel.lib (hyperel_lib): divisors in the jacobian of hyperelliptic curves
-
new library: curvepar.lib (curvepar_lib): space curves
-
new library: sagbi.lib (sagbi_lib): subalgebras bases analogous to Groebner bases for ideals
-
new library: surfex.lib (surfex_lib): visualizing and rotating surfaces
-
new library: cimonom.lib (cimonom_lib): determines if the toric ideal of an affine monomial curve is a complete intersection.
-
sheafcoh_lib: new experimental functions, in particular sheafCohBGG2
-
library
ncall.lib
merged into all_lib
-
library center.lib (
center_lib
) renamed to central.lib
(central_lib)
-
nctools_lib: new functions for super-commutative algebras (i.e. SuperCommutative, IsSCA, AltVarStart, AltVarEnd)
-
resolve.lib: blow ups revised (resolve_lib)
-
new algorithms in primdec.lib (primdec_lib): radical et al.
-
improved version of slimgb, incorporated into groebner,
strategy change in groebner
-
finvar.lib: the algorithm of secondary_char0 is now used in general in the
non-modular case (finvar_lib)
-
finvar.lib: new algorithm for irred_secondary_char0 (finvar_lib)
-
finvar.lib: new function irred_secondary_no_molien (finvar_lib)
-
finvar.lib: new functions for computing minimal generating sets of
invariant rings of finite groups in the non-modular case: invariant_algebra_reynolds for finite
matrix groups and invariant_algebra_perm for permutation groups (finvar_lib)
-
operation for sparse matrices improved: multiplication, prune, conversion to module
-
experimental:
python
/ ipython
interface
News in version 3-0-2
The version 3-0-2 is mainly a bug fix release,
but it contains also some new features:
-
factory, libfac updated for gcc 4.1.x
-
configure/speed improved for 64bit architectures
-
new library: dmod.lib (dmod_lib)
-
new library: perron.lib (perron_lib)
-
improved center.lib: revised implementation, new functions (sa_reduce etc.)
-
revised ncalg.lib (ncalg_lib): new algebras, U(sl_n) and U(g_2) changed to conform GAP.
-
new algorithms in primdec.lib (primdec_lib): radical et al.
-
improved version of slimgb, incorporated into groebner
-
finvar.lib: new algorithm for secondary_char0, which is a drastic improvement
(finvar_lib).
-
finvar.lib: new function irred_secondary_char0 (finvar_lib).
-
finvar.lib: new function rel_orbit_variety, complementing relative_orbit_variety
(finvar_lib).
-
improved module generator (
modgen
)
-
experimental: new type bigint
-
more architectures: Solaris on x86/opteron, ...
-
build process improved: builds automatically without patches on 64bit architectures
NEWS in version 3-0-1
The version 3-0-1 is mainly a bug fix release,
but it contains also some new features:
-
NTL upgraded to version 5.4
-
new library: absfact.lib absfact_lib
-
new procedures in primdec.lib: absPrimdecGTZ
-
new procedures in standard.lib: weightKB
-
build process improved: new make target
install_all
-
improved version of slimgb, incorporated into groebner
-
arithmetic in Z/pZ for architecture x84_64 improved (by 25 %)
NEWS in version 3-0-0
The version 3-0-0 is the first in the new
release series version 3-0.
Singular version 3 has a greater functionality and an improved architecture.
Major new features are:
-
Dynamic modules
-
non-commutative extension Non-commutative subsystem PLURAL
-
name spaces (package)
-
easy manipulation of rings (ringlist)
-
improved speed of maps (subst, map)
-
a new algorithm for Groebner base computations: slimgb.
-
improved factorization (integration of NTL, factorization over algebraic extensions,
zeroset.lib)
-
improved gcd of polynomials (including bug fixes)
-
ports to more architectures including automatic building from source (fink on Mac, ebuild on Gentoo)
-
more help browsers supported, user extendable (help.cnf)
-
better support of graded modules
-
many bugs fixed
Besides theses internal changes, Singular version 3 offers many new
features and functionalities (which were partly already incorporated in
the 2-1 pre-release series).
Factorizing algorithms revisited
Starting with version 2-0-4, we use NTL (of Victor Shoup) for factoring
univariate polynomials. The multivariate factorization code in libfac/factory
now also works over algebraic extension fields.
New SINGULAR libraries
- control_lib
- algebraic analysis tools for System and Control Theory
- mregular_lib
- procedures for computing the Castelnuovo-Mumford regularity
- mprimdec_lib
- procedures for primary decomposition of modules
- gmspoly_lib, gmssing_lib
- procedures for the Gauss-Manin connection of a singularity
- resolve_lib, reszeta_lib
- resolution of singularities and applications
- rootsmr_lib
- counting the number of real roots
- sheafcoh_lib
- computing cohomology of sheaves and Tate resolution
- signcond_lib
- computing realizable sign conditions
- rootsur_lib
- counting number of real roots of univariate polynomial
- grwalk_lib
- Groebner and Pertubation walk
Changes in 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.
New SINGULAR functions
- ringlist
- manipulation of rings
- slimgb
- a new algorithm to compute Groebner bases
- exportto
- transfer an identifier to the specified package
- importfrom
- generate a copy of an identifier from the specified package in the current package
- frwalk
- fractal walk to change monomial orderings
SINGULAR functions whose syntax/semantics has changed
- degree
- outputs degree and dimension instead of returning an int
- attrib
- new attribute:
rowShift
Noncommutative Extension PLURAL
Starting with version 3-0-0, SINGULAR features a
noncommutative extension 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 PLURAL come the following libraries:
center.lib
- computes generators of the center and centralizer subalgebras up
to a given degree resp. up to a given number of generators
- involut_lib
- determines linear antiautomorphisms (involutions) and automorphisms
- gkdim_lib
- computes a Gel'fand-Kirillov dimension for modules
- ncalg_lib
- includes ready-to-use funtions for defining many important
noncommutative algebras
- ncdecomp_lib
- computes a decomposition of module by its central characters
- ncalg_lib, nctools_lib
- contain numerous useful tools for noncommutative algebras
- qmatrix_lib
- procedures, related to quantum matrices and minors
Internal Changes
- new mapping code
- factory revised
- (gcd, factorizing polynomial over algebraic extension fields,...)
Porting
- Singular is available for ix86-Linux,
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
Singular version 3-0-3, May 2007,
generated by texi2html.