Proposition: Prop. 11.01: Straight Line cannot be in Two Planes
(Proposition 1 from Book 1 of Euclid's “Elements”)^{1}
Some part of a straight line cannot be in a reference plane, and some part in a more elevated (plane).
Modern Formulation
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Table of Contents
Proofs: 1
Mentioned in:
Proofs: 1 2 3 4
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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
Footnotes