In other words, is it the case that for every abelian group $G$, there exists a graph $H$ such that the sandpile group of $H$ is isomorphic to $G$? If not, is the truth of falsity of this still an open question?
2026-03-30 03:03:41.1774839821
Is there an analogue of Frucht's theorem for sandpile groups?
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