Hi,
Is this a bug or is it expected behavior?
sage: M1 = matrix(ZZ,2,[[-1,0],[0,1]])
sage: M2 = matrix(ZZ,2,[[1,0],[0,-1]])
sage: M3 = matrix(ZZ,2,[[-1,0],[0,-1]])
sage: MG = MatrixGroup([M1, M2, M3])
sage: MG.order()
4
sage: MG.list()
Traceback (click to the left for traceback)
...
AttributeError: 'sage.rings.integer_ring.IntegerRing_class' object
has
no attribute 'prime_subfield'
thanks
john perry
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