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Source — Euclid's Elements, encoded as an rrxiv paper — rrxiv

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Source — Euclid's Elements, encoded as an rrxiv paper

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IX.4 Proposition IX.4

If a cube number by multiplying a cube number make some number, the product will be cube.

Proof

a^{3} \cdot b^{3} = (ab)^{3}

by commutativity (VII.16).

lines 74–74 in main.tex