Proving the Math, Not Trusting It
How I made an AI’s financial analysis trustworthy enough to act on
I gave the AI’s math a check it can’t influence: the AI builds the analysis as a working Excel model, every number a live formula, and separate Python recomputes each number from the raw inputs. The two have to tie out; they share nothing but the data, so they can’t agree on a wrong answer. Then I planted bad math to prove the check fails exactly when it should.
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