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Ageometresia or ageometria is a word describing a defect in a work of geometry.[1]

An early usage of the word was in writings of François Viète on Copernicus.[2] As another instance, Johannes Kepler, having no direct and geometrical method of finding certain matters in his elliptical theory, namely how to calculate the true anomaly from the mean anomaly, has been charged by others with ageometresia.[3][4]

Although Viète wrote in Latin, the word "ageometresia" is Greek,[2] and the same Greek word has also subsequently been used by writers in English.[1] As well as its usage to indicate faults in the works of professional mathematicians, "ageometria" has also been used to describe a form of dyscalculia, a disability that prevents students from understanding geometry.[5][6]


  1. ^ a b Encyclopaedia Perthensis; or Universal dictionary of the arts, sciences, literature, &c. intended to supersede the use of other books of reference, 1, John Brown, 1816, p. 308 .
  2. ^ a b Rosen, Edward (1992), On the revolutions: Foundations of natural history, Complete Works of Nicolas Copernicus, 1, Johns Hopkins University Press, p. 334, ISBN 978-0-8018-4515-4 .
  3. ^ Dharampal (1971), Indian science and technology in the eighteenth century: some contemporary European accounts, Impex India, p. 58 .
  4. ^ Chambers, Ephraim (1728), Cyclopaedia, or an Universal Dictionary of Arts and Sciences, p. 45 .
  5. ^ Schiefelbusch, Richard L.; Barket, Marilyn (1978), Bases of Language Intervention, Language intervention series, 1, University Park Press, p. 23, ISBN 978-0-8391-1197-9 .
  6. ^ Berg, Bruce O. (1996), Principles of Child Neurology, McGraw-Hill, p. 362, ISBN 978-0-07-005193-5 .