Money is round so it can roll.
—Göran Nordström, on a postcard from Argentina.
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References
E. Clark and R. Ehrenborg. The Frobenius complex. Ann. Comb. 16 (2012), 215–232.
J. J. Sylvester. On subvariants, i.e. semi-invariants to binary quantics of an unlimited order. Amer. J. Math. 5 (1882), 79–136.
Acknowledgments
The author thanks Theodore Ehrenborg for comments on an earlier draft of this note. The author also thanks the Institute for Advanced Study for hosting a research visit in summer 2019, where this work was completed. This work was partially supported by a grant from the Simons Foundation (#429370 to Richard Ehrenborg).
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Ehrenborg, R. The Frobenius Coin Problem—A Cylindrical Approach. Math Intelligencer 42, 78–79 (2020). https://doi.org/10.1007/s00283-019-09948-x
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DOI: https://doi.org/10.1007/s00283-019-09948-x