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 Z-basis for the space of matrices with gtrAg = 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 skew-symmetric 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 Z-basis of the Q-span 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
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