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Rikard Bögvad

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Rum 211, hus 6, Kräftriket, S-106 91 Stockholm.                                                                                Tel +46(0)8164542 ,
                                                                       
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Arxiv




 Postulate 5: "If a line segment intersects two straight lines,
 forming two interior angles on the same side that sums to less than two right angles,
then the two lines,
if extended indefinitely,
meet on that side on which the angles sum to less than two right angles






Postulate 1: "To draw a line from any point to any point"

(From my forthcoming book"Travels with Euclid on a roughly spherical world"... )

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Rikard Bögvad rikardmath.su.se

Uppdaterad: 2010-11-29