1. The problem statement, all variables and given/known data Hi I'm in second year of study in Math, Physic and Informatic and I require some help. I began a work on the brachistochrone problem. It's really interesting and I already found lot of things (the equation of the cycloid by the Bernoulli's method, I wrote some programs which draw the curve between two point,... ) But after this first researchs and results I don't know how to continue... Could you help me, give me some indication to go further ? 2. Relevant equations Parametric equation of the cycloid 3. The attempt at a solution Further in math : curves generate by other geometric figures ? Further in physic : friction actions ? Speed font ion of the time ? Further in Informatic : No idea... Thank's for your help :) PS : excuse me for my English.... I'm French and I'm still learning !