Proof: By Euclid

(related to Proposition: Prop. 11.01: Straight Line cannot be in Two Planes)

1

fig01e


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References

Adapted from (subject to copyright, with kind permission)

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

Footnotes


  1. The proofs of the first three propositions in this book are not at all rigorous. Hence, these three propositions should properly be regarded as additional axioms (translator's note) 

  2. This assumption essentially presupposes the validity of the proposition under discussion (translator's note).