Proposition: Prop. 9.26: Odd Number minus Odd Number is Even
Euclid's Formulation
If an odd (number) is subtracted from an odd number then the remainder will be even.
* For let the odd (number) $BC$ have been subtracted from the odd (number) $AB$.
* I say that the remainder $CA$ is even.
Modern Formulation
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Table of Contents
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References
Adapted from (subject to copyright, with kind permission)
 Fitzpatrick, Richard: Euclid's "Elements of Geometry"
Adapted from CC BYSA 3.0 Sources:
 Prime.mover and others: "Pr∞fWiki", https://proofwiki.org/wiki/Main_Page, 2016