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When I use MathJax, sometimes the fraction lines got a different thickness (below imgage). Why?

Another question is how to increase the vertical space between the lines, because in \begin{align} ... \end{align} the lines are so close to each other and it's hard to read them (as you can see on the below sample image).

enter image description here

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closed as off topic by Loop Space, yo', lockstep, diabonas, Stefan Kottwitz Oct 4 '12 at 21:19

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MathJaX doesn't use the same program as TeX so questions about MathJaX aren't really on topic here. You will probably have more luck at the MathJaX Help Forums – Loop Space Oct 4 '12 at 18:59
See my response here for details of why this happens in MathJax. – Davide Cervone Oct 5 '12 at 15:43
Ps, you can use \\[dimen] to add extra space between lines of an alignment. So \\[5pt] would add an extra 5 points of space between the lines at that breakpoint. – Davide Cervone Oct 10 '12 at 17:15
For everybody who encounters this issue. Say you have a presentation tomorrow and really want all fractions to appear at all costs, you can use your own definition of fractions (with thicker lines): \begin{align}\genfrac{}{}{1pt}{0}{a+b}{c+d}\frac{a+b}{c+d} – Lukas Nov 11 at 21:43

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