I edited Multiplying divergent integrals using Hardy fields approach to put equations clearly meant to be displayed in display mode. Once I did so, one of the equations exhibited very strange spacing, which I cannot account for from the source:

```
$$\int_0^\infty e^x dx\cdot\int_0^\infty e^x dx=\int_0^\infty (2 e^{2 x}-2 e^x)dx=2\int_0^\infty e^{2 x}dx-2\int_0^\infty e^x dx.$$
```

As you can see, all integrals are coded the same way, and the integrals on the first line appear as expected, but the limits on the second integral are too far away from the $\int$ sign. (It is explicitly something about multi-line display, because increasing my window size and refreshing shows the limits in the last integral spaced as the others as soon as they are all on the same line.)

Thanks to @MartinSleziak for reminding me to include the renderer I am using. It is HTML-CSS with Fast Preview. Here is the equation as MathJax, not an image: $$\int_0^\infty e^x dx\cdot\int_0^\infty e^x dx=\int_0^\infty (2 e^{2 x}-2 e^x)dx=2\int_0^\infty e^{2 x}dx-2\int_0^\infty e^x dx.$$

`\limits`

: it looks often better $$\int\limits_0^\infty e^x dx\cdot\int\limits_0^\infty e^x dx=\int\limits_0^\infty (2 e^{2 x}-2 e^x)dx=2\int\limits_0^\infty e^{2 x}dx-2\int\limits_0^\infty e^x dx.$$ $\endgroup$