complete the steps of the fisher equation by showing that if we:

1+z' B ' ' h = 1 . (a) egm Wit 1 + We + 7" 1 (b) Replace 1 + with the Taylorseries expansion We 1 = 17r''+(7re)2(We)3+(7re)4... 1 + 71's in the expression in part 3(a) above. (0) Assume that we can ignore (i.e., set to zero) any terms involving if or (1%)\" for n 2 2 because are is small. 8 that we are left with the Fisher equation 7" = i 7r