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Dear Forum,

I came across a necessity to convert a mapping defined by

MappingByFunction into a permutation. Is there any GAP-function to do

it?

My particular example arises when I want to define the group

$G=P\Gamma L(n,q)$

in its action on the points of projective space $PG(n,q)$.

It is straightforward to get $PGL(n,q)$ and the extra mapping

f (Frobenius automorphism) needed to generate $G$.

However f is given as MappingByFunction and I don't see a regular

way to convert f into a permutation.

Best regards,

Dima

----------------------------------------------------------------- Dmitrii V. Pasechnik RIACA/CAN 419 Kruislaan 1098 VA Amsterdam The Netherlands phone: +31 20 560 8490 fax: +31 20 560 8448 email: dima@can.nl

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