Abstract
In one of the oldest Chinese books I-Ching (Book of Changes), which dates approximately from the 8th century bc, there is a picture (so-called hexagram) containing \(8\times 8\) boxes. Each box contains 6 broken or full horizontal lines (see Fig. 1.1).
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Křížek, M., Somer, L., Šolcová, A. (2021). Divisibility and Congruence. In: From Great Discoveries in Number Theory to Applications. Springer, Cham. https://doi.org/10.1007/978-3-030-83899-7_1
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DOI: https://doi.org/10.1007/978-3-030-83899-7_1
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