## Section

- inline formula: $x^2=-1$.
- displayed formula: $$a^2+b^2=c^2.$$
- numbered formula: \begin{align} \int_{0}^{1}2x \mathop{}\!\mathrm{d} x &=x^2\Big|_{x=0}^1\label{eq:sample}\\ &=1. \end{align}
- equation reference: \eqref{eq:sample}.
- citation: (Einstein, 1905).

## Another section

**Theorem 1**.

*This is a theorem environment.*

Theorem reference: Theorem 1.

## References

Einstein, A. (1905). Zur Elektrodynamik bewegter Körper. (German) [On the electrodynamics of moving bodies].

*Annalen Der Physik*,*322*(10), 891–921.