Hi to all,

Let us say that "reg" is a permutation group. I want to find the
elements of reg that send 12 to 1. Is there a better way to do that (in
one step, say) than:

sage: def f(x): return x(12)==1
....: 
sage: filter(f,reg.list())
[(1,12)(2,5)(3,4)(6,7)(8,11)(9,10)]

?

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