mathjax-test

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From demo

When $a \ne 0$, there are two solutions to \(ax^2 + bx + c = 0\) and they are $x = {-b \pm \sqrt{b^2-4ac} \over 2a}.$

Line starts from $$

$$N = \sum_{n=1}^r x_n$$

$$N = \sum_{n=1}^r x_n$$

(Converted to <script type="math/tex"> by Jekyll)

Line does not start from $$

test: $$N = \sum_{n=1}^r x_n$$

test: $N = \sum_{n=1}^r x_n$

(Converted to <script type="math/tex; mode=display"> by Jekyll)

Use script type math/tex

$ax+by+c=0$

$$\sum_{i=1}^n x_i$$