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\documentclass[../ising_model.tex]{subfiles}
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\begin{document}
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\appendix
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\section{Ising model system states}\label{sec:system_states}
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To avoid counting duplicates, we used
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\begin{figure}\label{fig:tikz_counting}
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\centering
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\begin{tikzpicture}
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\draw (0, 0) grid (2, 2);
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% \node[inner] (s1) at (0.5, 0.5) {s};
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\node (s1) at (0.5, 1.5) {$s_1$};
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\node (s2) at (1.5, 1.5) {$s_2$};
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\node (s3) at (0.5, 0.5) {$s_3$};
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\node (s4) at (1.5, 0.5) {$s_4$};
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\node[gray] (s12) at (2.5, 1.5) {$s_1$};
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\node[gray] (s34) at (2.5, 0.5) {$s_3$};
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\node[gray] (s13) at (0.5, -0.5) {$s_1$};
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\node[gray] (s24) at (1.5, -0.5) {$s_2$};
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\draw[red, ->] (s1.east) -- (s2.west);
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\draw[red, ->] (s2.east) -- (s12.west);
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\draw[red, ->] (s1.south) -- (s3.north);
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\draw[red, ->] (s2.south) -- (s4.north);
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\draw[red, ->] (s3.east) -- (s4.west);
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\draw[red, ->] (s4.east) -- (s34.west);
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\draw[red, ->] (s3.south) -- (s13.north);
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\draw[red, ->] (s4.south) -- (s24.north);
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\end{tikzpicture}
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\caption{Rules for multiplying spin pairs.}
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\end{figure}
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\section{Analytical expressions}\label{sec:analytical_expressions}
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The Boltzmann distribution is normalized using a partition function $Z$ given by
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\begin{align*}
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Z &= \sum_{\text{all possible } s_{i}}^{N} e^{-\beta E(\mathbf{s})} \\
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&= \dots \\
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&= 4 \cosh (8 \beta J) + 12 \\
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\end{align*}
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\end{document}
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