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Source — Euclid's Elements, encoded as an rrxiv paper — rrxiv
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Euclid's Elements, encoded as an rrxiv paper
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VII.13
Proposition VII.13
If four numbers be proportional, they will also be proportional alternately.
Proof
Discrete analogue of V.16, deduced from VII.9 / VII.10 (the parts versions of alternation).
lines 74–74 in
main.tex
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