#mathematics #mathsmanuelacasasoli #maths
The equation of a lemon...
The equation x^2 + z^2 = y^3 (1−y)^3 of Citrus appears as simple as the figure itself.

Many ideas for teachers
Imaginary - Open Mathematics
1-https://www.imaginary.org/gallery/herwig-hauser-classic
2-https://www.imaginary.org/