E.1 News and changes

NEWS in SINGULAR 4-1-0

News for version 4-1-0

Syntax changes:

• new (additional) form of ring definitions: (for example ring R=QQ[x,y,z];) ( General syntax of a ring declaration)
• new (additional) form of multi-indicies: (for example i(1,2,3,4,5)) ( Names)
• changed behaviour of charstr ( charstr)
• new data type cring to describe the coeffient rings, to be used for the new definitions for (polynomial) rings ( General syntax of a ring declaration)
• new command ring_list to access the parts used to contruct polynomial rings ( ring_list, ringlist)
• extended polynomial ring construction: also from lists produced by ring_list
• new attribute ring_cf for ring ( attrib)
• printing of rings changed to match cring names ( charstr)

New libraries:

• new library: classifyMapGerms.lib: standard basis of the tangent space at the orbit of an algebraic group action ( classifyMapGerms_lib)
• new library: ffmodstd.lib: Groebner bases of ideals in polynomial rings over algebraic function fields( ffmodstd_lib)
• new library: nfmodsyz.lib: syzygy modules of submodules of free modules over algebraic number fields( nfmodsyz_lib)
• new library: curveInv.lib: invariants of curves ( curveInv_lib)
• new library: gfan.lib: interface to gfanlib ( gfan_lib)
• extended library: interface to polymake merged into polymake_lib
• new library: tropicalNewton.lib: Newton polygon methods in tropical geometry ( tropicalNewton_lib)
• new library: schubert.lib: some procedures for intersction theory ( schubert_lib)

Changed libraries:

• classify_aeq.lib: new procedures ( classify_aeq_lib)
• grobcov.lib: new version ( grobcov_lib)
• ncfactor.lib: factorization in some noncommuative algebras ( ncfactor_lib) with new routine ncfactor ( ncfactor)
• primdec.lib: new option "subsystem" ( primdec_lib)

Changes in the kernel:

• improved mapping of polynomials/ideals/...
• port to gcc 6
• port to gfanlib 0.6 (requires C++11, i.e. gcc >=4.3)
• port to NTL 10
• port to polymake 3.0
• port to readline 7
• sba works for global orderings, also for coefficient types Z and Z/m
• std works for all orderings, also for coefficient types Z and Z/m with local/mixed orderings
• factorize works for polynomial rings over ZZ

Experimental stuff:

• module customstd_lib: modify std ( satstd)

News for version 4-0-3

New libraries:

• new library: brillnoether.lib: Riemann-Roch spaces of divisors on curves ( brillnoether_lib)
• new library: chern.lib: Chern classes ( chern_lib)
• new library: ffmodstd.lib: Groebner bases of ideals in polynomial rings over algebraic function fields( ffmodstd_lib)
• new library: GND.lib: General Neron Desingularization ( GND_lib)
• new library: graal.lib: localization at prime ideals ( graal_lib)
• new library: hess.lib: Riemann-Roch space of divisors ( hess_lib)

Changed libraries:

• renamed algemodstd_lib to nfmodstd_lib, extended to module
• renamed derham_lib to deRham_lib
• grobcov.lib (grobcovK): Groebner Cover for parametric ideals ( grobcov_lib) with new routine ConsLevels ( ConsLevels), removed AddCons AddConsP.

News for version 4-0-2

• align ( align)
• branchTo ( procs with different argument types)
• -> ( proc expression)

Change in ring handling:

• typeof( qring ) returns "ring"

New libraries:

• algemodstd.lib: Groebner bases of ideals in polynomial rings over algebraic number fields(renamed to nfmodstd_lib)
• arr.lib: arrangements of hyperplanes ( arr_lib)
• brillnoether.lib: Riemann-Roch spaces of divisors on curve ( brillnoether_lib)
• hess.lib: Riemann-Roch space of divisors on function fields and curves ( hess_lib)
• gradedModules.lib: graded modules/matrices/resolutions ( gradedModules_lib)

Changed libraries:

• revised polymake interface (polymake.so)
• revised gfanlib interface (gfanlib.so)
• Presolve::findvars ( findvars, variables)
• Ring::addvarsTo ( addvarsTo)
• Ring::addNvarsTo ( addNvarsTo)
• Ring::hasAlgExtensionCoefficient ( hasAlgExtensionCoefficient)
• Schreyer::s_res ( s_res)
• grobcov.lib (grobcovK) ( grobcov_lib) with new routines AddCons AddConsP.
• normaliz.lib (for normaliz >=2.8) ( normaliz_lib)
• renamed groebnerFan to groebnerFanP in polymake.lib ( polymake_lib)
• renamed fVector to fVectorP in polymake.lib ( polymake_lib,polymakeInterface_lib)

News for version 4-0-1

Version 4-0-1 is a bug fix release.

New feature: attribute ring_cf for ring ( attrib)

News for version 4-0-0

Version 4-0-0 is a milestone relase of Singular. The new release series 4 aims for an entirely modularized architecture simplifying connectivity with other systems and paving the way for parallel computations. As a first step in modularization, the new release features an internal structural separation of coefficient rings and polynomial rings. This allows for a flexible integration of new coefficient rings.

SINGULAR 4-0-0's list of new functionality and significant improvements further extends that of the 3-1-6/7 prerelease series.

New functionality

• de Rham cohomology of complements of algebraic varieties ( deRham_lib)
• Gromov-Witten numbers of elliptic curves ( ellipticcovers_lib)
• classification of isolated complete intersection singularities in characteristic 0 ( classifyci_lib)
• parametrization of orbits of unipotent actions ( orbitparam_lib)
• F5-like Groebner basis algorithm ( sba)
• element-wise application of functions to data structures ( apply)
• support for debugging libraries ( ASSUME)

Improved functionality

• Groebner cover for parametric ideals ( grobcov_lib)
• normalization of affine rings ( normal_lib)
• classification of real singularities ( realclassify_lib)
• GIT-fans ( gitfan_lib)
• algebraic/transcendental field extensions
• Non-commutative subsystem
• an abstraction layer for parallel computations ( parallel_lib)
• run-time loading of supplementary kernel code ( Dynamic modules)
• interpreter language support for name spaces ( package)

Availability

SINGULAR is available as source code and for Linux, Mac OS X, Windows, FreeBSD and SunOS-5.