Validity of the fractional Leibniz rule on a coarse-grained medium   yields a modified fractional chain rule
  In this short communication, we show that the validity of the Leibniz rule for a fractional derivative on a coarse-grained medium brings about a modified chain rule, in agreement with alternative versions of fractional calculus. We compare our results to those of a recent article on this matter. 
Jos\'e Weberszpil
math.CA math-ph math.MP