$$ f(a) = \frac{1}{2 \mathrm{\pi} i} \oint_\gamma \frac{f(z)}{z-a} \mathrm{d}z $$ (Cauchy's integral formula) Ghost does not have a native way to show equations, but we can add the wonderful MathJax JavaScript library to do it for us. Install MathJax The easiest way to