Best known for his collection of piano studies, Gradus ad Parnassum, to which Debussy's piece Doctor Gradus ad Parnassum makes playful allusion.
... the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} ...