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[stilmant]

The equation given by $y = mx + c$.

The integral from $a$ to $b$ of $x^2$ is:
$$
\int_{a}^{b} x^2 \, dx
$$

Here is a matrix:
$$
\begin{pmatrix}
a & b \\
c & d
\end{pmatrix}
$$

The sum of the first $n$ natural numbers is:
$$
\sum_{i=1}^{n} i = \frac{n(n+1)}{2}
$$

The product of the first $n$ natural numbers is:
$$
\prod_{i=1}^{n} i = n!
$$