Or just
sage: A.smith_form()
(
[1 0] [ 0 1] [-3 -4]
[0 5], [ 1 -3], [-2 -3]
)
here the 1st entry is the Smith Normal Form of A, and the 2nd and 3rd
ones are what
one uses to conjugate A to get it.
(Yes, in English "present a group" means generators and relations, as
opposed to "represent", which
means a linear representation. Non-native Englsh speakers sometimes
flip the meaning of these, e.g. in Russian
the "представление" means "represenation", and ''копредставление''
means "presentation'')
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