# Wichmann Columns

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Much of the following explanation comes from the Demonstrations Wichmann-like Rulers [1] and Sparse Rulers [2].

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Contributed by: Ed Pegg Jr (January 2020)

Open content licensed under CC BY-NC-SA

## Details

References

[1] E. Pegg Jr. "Wichmann-like Rulers" from the Wolfram Demonstrations Project—A Wolfram Web Resource. demonstrations.wolfram.com/WichmannLikeRulers.

[2] E. Pegg Jr. "Sparse Rulers" from the Wolfram Demonstrations Project—A Wolfram Web Resource. demonstrations.wolfram.com/SparseRulers.

[3] B. Wichmann, "A Note on Restricted Difference Bases," *Journal of the London Mathematical Society*, s1–38(1), 1963 pp. 465–466. doi:10.1112/jlms/s1-38.1.465.

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