Bert Niehaus

Prefix ${\textstyle f'(x_{0})=\lim _{x\to x_{0}}{\frac {f(x)-f(x_{0})}{x-x_{0}}}}$ postfix

Zentrierter math-Block $\sum _{k=1}^{n}k={\frac {n\cdot (n+1)}{2}}$

\lim _{n\to \infty }s_{n}=\lim _{n\to \infty }\sum _{j=0}^{n}b_{j+1}