Why Do Mathematicians Re-prove Theorems?

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Proofs as bearers of mathematical knowledge (2008, background): “... of different methodologies”; (4) “To provide a rational reconstruction (or justification) of historical practices”; (5) “To extend a result, or to generalize it to other contexts”; (6) “To discover a new route”; (7) “Concern for methodological purity”; and (8) “The existence of multiple proofs o”
Cognitive Development of Proof (2011, background): “An ordinary mathematical proof consists of an argument to convince an audience of peer experts that a certain mathematical claim is true and, ideally, to explain why it is true (cf. Dawson, 2006).”