@comment -*-texinfo-*-
@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

@heading News for version @value{VERSION}

Syntax changes:
@itemize
@item new (additional) form of ring definitions: (for example @code{ring R=QQ[x,y,z];})
      (@nref{General syntax of a ring declaration})
@item new (additional) form of multi-indicies: (for example @code{i(1,2,3,4,5)})
      (@nref{Names})
@item changed behaviour of @code{charstr} (@nref{charstr})
@item new data type @code{cring} to describe the coeffient rings, to be used
      for the new definitions for (polynomial) rings (@nref{General syntax of a ring declaration})
@item new command @code{ring_list} to decompose polynomial rings (@nref{ring_list})
@item extended polynomial ring construction: also from lists produce by @code{ring_list}
@item new attribute @code{ring_cf} for @code{ring} (@nref{attrib})
@item printing of rings changed to match @code{cring} names (@nref{charstr})
@end itemize

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

Changed libraries:
@itemize
@item classify_aeq.lib: new procedures (@nref{classify_aeq_lib})
@item grobcov.lib: new version (@nref{grobcov_lib})
@item ncfactor.lib: factorization in some noncommuative algebras (@nref{ncfactor_lib}) with new routine ncfactor (@nref{ncfactor})
@item primdec.lib: new option "subsystem" (@nref{primdec_lib})
@end itemize

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

Experimental stuff:
@itemize
@item module @nref{customstd_lib}: modify @code{std} (@nref{satstd})
@end itemize

@heading News for version 4-0-3

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

Changed libraries:
@itemize
@item renamed algemodstd_lib to @nref{nfmodstd_lib}, extended to @code{module}
@item renamed derham_lib to @nref{deRham_lib}
@item grobcov.lib (grobcovK): Groebner Cover for parametric ideals (@nref{grobcov_lib}) with new routine
   ConsLevels (@nref{ConsLevels}), removed AddCons  AddConsP.
@end itemize

@heading News for version 4-0-2
New commands:
@itemize
@item align (@nref{align})
@item branchTo (@nref{procs with different argument types})
@item @code{->} (@nref{proc expression})
@end itemize

Change in ring handling:
@itemize
@item @code{typeof(} qring @code{)} returns @code{"ring"}
@end itemize

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

Changed libraries:
@itemize
@item revised polymake interface (polymake.so)
@item revised gfanlib interface (gfanlib.so)
@item Presolve::findvars (@nref{findvars}, @nref{variables})
@item Ring::addvarsTo (@nref{addvarsTo})
@item Ring::addNvarsTo (@nref{addNvarsTo})
@item Ring::hasAlgExtensionCoefficient (@nref{hasAlgExtensionCoefficient})
@item Schreyer::s_res (@nref{s_res})
@item grobcov.lib (grobcovK) (@nref{grobcov_lib}) with new routines
   AddCons  AddConsP.
@item normaliz.lib (for normaliz >=2.8) (@nref{normaliz_lib})
@item renamed groebnerFan to groebnerFanP in polymake.lib (@nref{polymake_lib})
@item renamed fVector to fVectorP in polymake.lib (@nref{polymake_lib},@code{polymakeInterface_lib})
@end itemize

@heading News for version 4-0-1

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

New feature: attribute @code{ring_cf} for @code{ring} (@nref{attrib})

@heading 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.

@sc{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

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

Improved functionality

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

Availability

@sc{Singular} is available as source code and for Linux, Mac OS X, Windows, FreeBSD and
SunOS-5.