Price formula on p.10-11

[xenide]

For the price formula discussion, I suppose this is the instantaneous price (for an infinitesimally small input)? And the code implementation is found here?

Perhaps one suggestion I can give to improve both the notes and the code would be, to take into account the A_PRECISION that was introduced later, e.g. in SwapTemplateBase.vy. How would it change the impl of the code?