Fix typo in taylor series

Mathematik-V-ZF.tex

@@ -155,7 +155,7 @@ $$H(t) = (H_0 - v_0\tau)^{\frac{-t}{\tau}} + v_0 \tau$$
 
 \section{Taylor-Reihe}
 An der stelle $a$ einer Funtkion $f(x)$
-$$f(a) + \frac{f'(a)}{1!}(x-a) + \frac{f''(a)}{2!}(x-a)^2 + \frac{f''(a)}{3!}(x-a)^3 + ...$$
+$$f(a) + \frac{f'(a)}{1!}(x-a) + \frac{f''(a)}{2!}(x-a)^2 + \frac{f'''(a)}{3!}(x-a)^3 + ...$$
 
 \section{Operators}
 $$\mathrm{rot} \ u = \nabla \times \vec{u}$$