Program Invar_space
Usage
Invar_space 'file' [a] [s] [e=n] [d=n]
file: bravais_TYP containing a finite unimodular group G.
Description
Calculates a Zbasis for the space of matrices with g^{tr}Ag = A for all
g in G by a quick seminumerical algorithm with some random features. By
default all symmetric invariant matrices are calculated.
Options
a: All invariant matrices are calculated.
s: All skewsymmetric invariant matrices are calculated.
e=n: Changes the default value of control parameter from 100 to n>100.
d=n: The program will calculate n+1 elements F_0,..., F_n of the
invariant space, then it calculates a Zbasis of the Qspan of
F_0, ..., F_n intersected with Z^nxn.
This option is only usefull if one knows the dimension of the
space of invariant forms. By default this number is calculated
by modular arithmetic.
Remarks
See also for Form_space.
Examples
