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We can also write matrices: \[ \mathbf{A} = \begin{pmatrix} a_{11} & a_{12} \\ a_{21} & a_{22} \end{pmatrix}. \]

\begin{abstract} This document demonstrates the use of the \texttt{sfns} package, which provides access to Apple's San Francisco (SFNS) font family. The abstract, body text, headings, and mathematical expressions all render using the clean, modern sans-serif design of SF Pro Text and SF Pro Display. \end{abstract} sfns font

\section{Introduction}

One key advantage of the \texttt{sfns} package is that it sets both text and math fonts to match. Below is an example of inline mathematics: $E = mc^2$. A displayed equation: \[ \int_{0}^{\infty} e^{-x^2} dx = \frac{\sqrt{\pi}}{2}. \] We can also write matrices: \[ \mathbf{A} =