Geometrical functions: tools in GeoGebra

@article{Sangwin2008GeometricalFT,
  title={Geometrical functions: tools in GeoGebra},
  author={C. Sangwin},
  journal={MSOR connections},
  year={2008},
  volume={8},
  pages={18-20}
}
  • C. Sangwin
  • Published 2008
  • Computer Science
  • MSOR connections
When I read this, I was rather surprised that Hardy took a somewhat more liberal view of the idea of a function than we commonly do today. He gives a number of further examples, some of which involve formulae, an equation or algebraic expression in x and y, including an infinite series. Others involve a relationship between x and y which follow from some geometrical construction. In this article, I’d like to give some examples of geometrical functions as illustrated by the software GeoGebra. 
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