I am looking for examples of how "old" math that was (likely) developed without any applications in mind has found a new life in unexpected settings. Particular theorems would be best. Some examples are Euler's Theorem and its role in cryptography, Perron-Frobenius Theorem and its application to Google PageRank algorithm, and Steiner's Isoparametric Inequality and its use in detecting gerrymandering.
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1This question has been asked in numerous places, including here. See the page https://math.stackexchange.com/questions/486855/what-are-some-examples-of-mathematics-that-had-unintended-useful-applications-mu – KCd Dec 19 '24 at 02:56