Program Zass_main
Usage
Zass_main 'file1' 'file2' ['file3'] ['file4'] [s] [c] [d] [t]
file1: matrix_TYP containing a presentation for G.
file2: bravais_TYP containing the unimodular group G.
Description
Determines isomorphism type of the cohomology group H^1(G,Q^n/Z^n), or
in slight abuse of notation (since for finite G they are isomorphic)
the group of extensions H^{2}(G,Q^{n}/Z^{n}).
Options
s : writes the system of equations nessecary to
: determine the H^1(G,**) to file3
c : writes the cocycles to file3.co or (or file4.co if
: used together with s) and the denomiantors to
: file3.de (or file4.de respectively)
d : writes a different output format, which is meant for
: developing other programs, so do not us this option.
t : give transformation matrix.
Remarks
See also for Extensions/Vector_systems and Presentation.
Examples
