Dear GAP-Forum,

Nicola Sottocornola wrote:

> I have 2 matrix A and S defined in this way
 [...]
> 
> and 2 groups H and K
> 
> 
> H:=Group(A^2,S*A^2*S);
> K:=Group(A^3*S,S);
 [...]
> 
> SemidirectProduct(K,alpha,h);
> 
> I obtain an error message. Where is the error?

The error message is (I suppose) `No method found'. This means that GAP
(4.2) is not able to construct semidirect products of matrix groups in
characteristic zero.

This functionality will be updated in the coming release 4.3.

(If you need, I can send you a description how to construct a group
isomorphic to this semidirect product in 4.2.)

Best regards,

Alexander Hulpke

-- Colorado State University, Department of Mathematics,
Weber Building, Fort Collins, CO 80523, USA
email: hulpke@math.colostate.edu, Phone: ++1-970-4914288

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