I have to render equations in a webpage, and my choice was MathJAX (for several reasons which are beyond the scope of this question). The problem is that inline sums are rendered differently than not inline sums :
The inline sum $\sum_{i=1}^n\frac{\sqrt{i^2+1}}{5}$ is rendered as
The not-inline sum $$\sum_{i=1}^n\frac{\sqrt{i^2+1}}{5}$$ is rendered as
I would like the inline sum to be rendered with the i=1 and n like the real math notation.