Dear Fernando Fantino,
I do the following, and the program give me an error.
What happens?
gap> Z:=Centralizer(S10,pi);
Subgroup( Group( ( 1,10), ( 2,10), ( 3,10), ( 4,10), ( 5,10), ( 6,10),
( 7,10), ( 8,10), ( 9,10) ), [ ( 1, 2), ( 1, 3)( 2, 4), ( 3, 4),
( 5, 6, 7),
( 5, 8)( 6, 9)( 7,10), ( 8, 9,10) ] )
In GAP 3 (which you're using) defining a variable Z will destroy the
finite field functionality and lead to weird error messages as you're
observing. simply call the center differently (e.g. call it Y or ZZ
or z) and things will be fine.
The same problem will arise when overwriting X or E.
In GAP4 these variables are protected against overwriting, so the
problem cannot arise.
Best,
Alexander Hulpke
-- Colorado State University, Department of Mathematics,
Weber Building, 1874 Campus Delivery, Fort Collins, CO 80523-1874, USA
email: [EMAIL PROTECTED], Phone: ++1-970-4914288
http://www.math.colostate.edu/~hulpke
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