TeX Quellcode:

\displaystyle I(U_0 + \delta U) = I(U_0) + \frac{\text{d}I}{\text{d}U} \cdot \delta U + \frac{1}{2} \cdot \frac{\text{d}^2 I}{\text{d} U^2} \cdot (\delta U)^2 + \text{...} = K_0 + K_1 \cdot \delta U + K_2 \cdot (\delta U)^2 + \text{...}