00 Problem 4: Vogel-Fulcher-Tammann (VFT) and Williams-Landel-Ferry (WLF) equations. (15 points) As it was discussed in Class, the VFT equation is given B n = Aexp T-T where A, B, and To are the VFT equation parameters that only depend on the material. On the other hand, the WLF equation shows the ratio of the viscosities obtained at temperatures of T and Tref and is given n C(T-T) Mref C, +1 -Tref Use these two expressions and determine the Ci and C2 in terms of the VFT equation constants B ref log10 and To