I understand basic multivariate calculus (almost every STEM degree teaches it, and I paid attention), which is enough to understand the problem if not every detail about the solution, so I can partially follow what Fable is doing and guess whether it gets too sidetracked.

But the main loop was to show Fable the solution, ask it for a prompt that would get a clean context Fable to find a solution, run it, if it works ask the first Fable to remove details, if it doesn't quote a status report and ask it where the clean Fable went askew and to edit the prompt to prevent that.