Summary Imagine a sphere with its equator inscribed in an equilateral triangle. This Saturn-like figure will help us understand from where Cardano’s formula for finding the roots of a cubic polynomial ...

Ben Blum-Smith, Japheth Wood, Chords of an Ellipse, Lucas Polynomials, and Cubic Equations, The American Mathematical Monthly, Vol. 127, No. 8 (OCTOBER 2020), pp. 688-705 ...