equation
===============================================================================
%% Equations express mathematical notation in LaTeX syntax as block or inline elements.
1. Block equations
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Block equations start with `$$` and continue as an equation block.
```
$$ c = \pm\sqrt{a^2 + b^2}
```
Rendered
$$ c = \pm\sqrt{a^2 + b^2}
2. Inline equations
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Inline equations are enclosed by `$$...$$` within paragraph text.
Example: `The identity $$a^2+b^2=c^2$$ is well known.`
(i)> Equation rendering is performed by a math typesetting library, so use valid LaTeX syntax for reliable output.