And that, if a straight line falling on two straight lines make the interior angles on the same side less than two right angles, the two straight lines, if produced indefinitely, meet on that side on which are the angles less than the two right angles.
Father of geometry
Postulate 5 (Parallel Postulate), from 'Elements'
c. 300 BCE
Found in 1 providers: grok
Cross Reference
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"The postulates are not self-evident, but they are necessary for the development of geometry."
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Strange & Unusual