I need a reference for the proof of the bordered Hessian test. I know how to use it, but I kinda learned it "in the wild" and need a standard good reference for its proof to add to my references section. I tried to google for it, but I only found tons and tons of manuscripts teaching how to use it via computation examples, with no proofs/books.
2026-03-29 14:54:34.1774796074
Reference for the bordered Hessian method
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