Hi!

You can say like finding the eventual points of inflection of a curve given in implicit form f (x, y)=0 and that not it can or is difficult to explicit in form y=y (x) or x=x (y),

how for example

x^5 + y^5 + x^2*y - x*y^2 = 0 ?

P.S. I hope it is the correct subforum ...