Early-years teachers’ concept images and concept definitions: triangles, circles, and cylinders

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Geometry in early years: sowing seeds for a mathematical definition of squares and rectangles (2014, background): “Rectangles and squares represent a paradigmatic example of the conflict between the perceptual experience and the theoretical needs of a mathematical definition (on this delicate issue also see Kaur 2015; Tsamir et al. 2015), where”