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May 3, 2015 at 23:17 comment added Geoff Robinson @ToddLeason : I don't myself, but others may.
May 3, 2015 at 22:25 comment added Todd Leason But there are only finitely many of $\mathbb{Z}$-rank $\le n$ for fixed $n$. Do you know a result on their number ?
May 3, 2015 at 21:29 history edited Geoff Robinson CC BY-SA 3.0
clarification
May 3, 2015 at 21:24 history answered Geoff Robinson CC BY-SA 3.0