This is a section about Mathematics!

Mathematics is a very important subject about which there is a lot to say.

For example, this sentence. And then another one.


Mathematics

This is a section about Natural science!

Natural science is a very important subject about which there is a lot to say.

For example, this sentence. And then another one.


Natural science

Block math: <equation My favorite equation>

$$
\frac{1}{\sqrt{2}}
$$
{title=My favorite equation}

And another: <equation My second favorite equation>

$$
\frac{1}{\sqrt{2}}
$$
{title=My second favorite equation}

Ourbigbook defined LaTeX macro: $\abs{x}$

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Barack Obama @barack-obama 11

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