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  1. First list item
    • First nested list item
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Here is a simple footnote1.

A footnote can also have multiple lines2.

This is a second line.

这是一个行内公式: $E = mc^2$ 和 $a^2+b^2=c^2$.

这是一个行间公式:

\[\nabla \cdot \mathbf{E} = \frac{\rho}{\epsilon_0}\]

The Cauchy-Schwarz Inequality

\[\left(\sum_{k=1}^n a_k b_k \right)^2 \leq \left(\sum_{k=1}^n a_k^2 \right) \left( \sum_{k=1}^n b_k^2 \right)\]

  1. My reference. ↩

  2. To add line breaks within a footnote, prefix new lines with 2 spaces. ↩