Figure Eight Curve - MacTutor History of Mathematics

Watt's Curve - MacTutor History of Mathematics

Wassenaar J.) 2D Curves, PDF, Circle

Eight Curve -- from Wolfram MathWorld

Figure Eight Curve - MacTutor History of Mathematics

Eight Curve -- from Wolfram MathWorld

Deltoid

Superellipse - Wikiwand

La goma elàstica i la lemniscata de Gerono – GeoGebra

Imaging maths - Inside the Klein bottle

The Educational Times Database: History of the Educational Times and Mathematical Questions, 1847–1918

Graph Labelings: A Prime Area to Explore

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