Does anyone have a reference for the elementary divisor theorem which states that for any $2\times2$ integer matrix $A$, there exist matrices $P$ and $Q$ in $SL(2,Z)$ such that $PAQ$ is a diagonal matrix ?
Thanks.
2026-04-06 21:08:05.1775509685
Elementary divisor theorem for integer matrices
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I personally like the treatment Jacobson gives in his
Perhaps you might want to search for it.