E.1 News and changes

NEWS in SINGULAR 2-0-4

The current version 2-0-4 is an update to the release series version 2-0.

Changes with respect to version 2-0-3:

Factorizing algorithms revisited

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

Help system is configurable via LIB/help.cnf

The help browsers of Singular can be configured via the file LIB/help.cnf, also the addition of new help browsers is possible.

Extensions of the ring concept

new coefficient domains: arbitrary long real and complex numbers

no restriction on number of parameters

degree bound on exponent values (maximum is now 2^31, standard 2^15)

non-positives weights get a better handling (converts wp/Wp to ws/Ws)

handle blocks of mixed orders correctly

maximal prime characteristic is now 2147483629 instead of 32003

Changes in SINGULAR libraries

The documentation of libraries was generally improved.

equising_lib

procedures esStratum, isEquising now also for reducible polynomials
new procedures: tau_es (codim of mu-const stratum in semi-universal def. base); esIdeal ((Wahl’s) equisingularity ideal)

gaussman_lib

added bernstein: roots of the Bernstein polynomial of t

hnoether_lib

HNdevelop, reddevelop, essdevelop are obsolete, replaced by hnexpansion
multsequence is "repaired" (since branches computed by hnexpansion et al) are now ordered according to the needs of multsequence.
newtonpoly needs no longer that ordering of the basering is ls
new procedures: is_NND test if f is Newton non-degenerate

homolog_lib

new procedures: depth, fitting, flatteningStrat, isCM, isFlat, isLocallyFree, isReg, KoszulHomology, tensorMod, Tor

matrix_lib

in proc tensor(A,B): check if ncols(A)==0

normal_lib

new procedure: deltaLoc(f,S); (sum of) delta invariant(s) at conjugated singular points
proc genus makes now use of is_NND of hnoether.lib

primdec_lib

optimizations again

solve_lib

procedure laguerre_solve ignores no longer the 2nd parameter (precision of internal computation)
new procedure simplexOut: prints solution of simplex in nice format

Internal Changes

normal form computation uses

Bucket representation of polynomials.

factorization

revisited, missing cases implemented

NTL

NTL is used for univariate factorization

source code

adapted for use with gcc 3.1/3.2, gmp 4.x

Porting

• Singular is available for ix86-libc5, ix86-libc6, HPUX_9, HPUX_10, SunOS-4, SunOS-5, IRIX-6, ix86-Win (Windows 95/98/ME/NT/2K/XP), FreeBSD 4.x, MacOS X Windows 95/98/ME/NT/2K/XP and MacOS X
• MP functionality is not available on Windows 95/98/ME/NT/2K/XP and MacOS X.
• Singular 2-0-2 was the last version for MacOS 9