Zum Stufenaufbau des Parallelenaxioms

@article{Pambuccian1994ZumSD,
  title={Zum Stufenaufbau des Parallelenaxioms},
  author={Victor Pambuccian},
  journal={Journal of Geometry},
  year={1994},
  volume={51},
  pages={79-88}
}
Euclid's parallel postulate is shown to be equivalent to the conjunction of the following two weaker postulates: “Any perpendicular to one side of a right angle intersects any perpendicular to the other side” and “For any acute angle Oxy, the segmentPQ — whereP is a point onOx, Q a point onOy andPQ ⊥ Oy — grows indefinitely, i. e. can be made longer than any given segment”. 
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