Hi, 
i ran into a bug while trying to compute the molien series of a permutation 
group. 

SageMath version 9.3, Release Date: 2021-05-09,  Using Python 3.7.10. 
Operating system: Windows 11, 64-bit

It works fine for most permutation groups but calling: 

PermutationGroup(["(1,2,3,4,5,6,7)","(5,6,7)"]).molien_series()

gives an GAP Error which doesn't make sense to me in the given context. 

GAPError: Error, ^ cannot be used here to compute roots (use `RootInt' 
instead?)

Similar examples which also produce the same bug are:

PermutationGroup(["(1,2,3,4,5,7)","(5,6,7)"]).molien_series()
PermutationGroup(["(1,2,3,4,7)","(5,6,7)"]).molien_series()
PermutationGroup(["(1,2,3,4,7)","(5,7,8)"]).molien_series()
  
Thanks for looking into it. 
Kind regards, 
Jonas


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