> < ^ Date: Tue, 08 Feb 1994 20:06:00 +0100
> < ^ From: Steve Linton <sal@dcs.st-and.ac.uk >
^ Subject: Backtrack.

A slight but significant speed up of the backtrack functions in
permbckt.g is possible:

replace Subgroup by G.operations.Subgroup (or similar) wherever it
is called inside the recursion.

I am doing some backtracking in a rather large degree (306936)
permutation group, and it is spending an irritatingly large amount
of time checking that elements passed to Subgroup are actually in
the parent group.

Actually I think this check should be disablable anyway, as it can
force construction of a Stabiliser chain where none is really needed.


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