An Auto-Generated Cartography of Mathematical Theories: Has it been done already?

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While looking for a way to visualize the logical structure of mathematical theories a graph-like depiction came to my mind, where propositions are represented by vertices. An edge goes from proposition A to proposition B if A has been used in the proof for B. I know there are formal systems which represent mathematical knowledge and proof, so it should even be possible to automatically generate such a graph. Has something like this been done already?