Installation problems with 4.1.2

[frank.luebeck@…]

I wanted to upgrade Singular from 4.1.0 to 4.1.2 and ran into several problems:

• The user and permissions for most files in the archive

​ftp://jim.mathematik.uni-kl.de/pub/Math/Singular/UNIX/Singular-4.1.2-x86_64.tar.gz

are strange. When unpacked for a system wide installation then most users cannot read/use most files because of 640 permissions. Also the hint to use 'chmod' in your trouble-shooting paragraph is not correct. I did

chmod -R o+r . chown -R nobody.nogroup *

inside the unpacked directory (which could be done before packing the archive).

• When trying to use the help I get an error message saying that an index file share/singular/singular.idx is missing (it is there in 4.1.0).

• The following input worked with 4.1.0:

ring R = 2,(x,y),rp; ideal I = [x, x+y];

but not with 4.1.2. Removing the []'s seems to solve the problem. But why is there such a syntax change in a minor upgrade?

[hannes]

Thanks for the comments:

• permissions are fixed now.
• singular.idx moved to the right place
• "ideal I = [x, x+y];" was already wrong in older versions (something inside [] is a polynomial vector in Singular) - i.e. "[x, x+y]" is a vector (resp. module) which only be assigned to an ideal if in a free module of rank 1. Only the rank check is new.