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Proposition: Prop. 10.068: Straight Line Commensurable with Major Straight Line is Major

(Proposition 68 from Book 10 of Euclid's “Elements”)

A (straight line) commensurable (in length) with a major (straight line) is itself also major. * Let $AB$ be a major (straight line), and let $CD$ be commensurable (in length) with $AB$. * I say that $CD$ is a major (straight line).

Modern Formulation

(not yet contributed)

Table of Contents

Proofs: 1

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References

Adapted from (subject to copyright, with kind permission)

1. Fitzpatrick, Richard: Euclid's "Elements of Geometry"

Adapted from CC BY-SA 3.0 Sources:

1. Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016