Euclidean geometry is attributed to a mathematician.
  He is credited with the first use of deductive reasoning applied to geometry, by deriving four corollaries to Thales's theorem
 A broad vision of the subject of geometry was then expressed  by Riemann in his 1867 inauguration lecture ber die Hypothesen, welche der Geometrie zu Grunde liegen (On the hypotheses on which geometry is based), published only after his death

