The only precise statement (coming from a reliable source) of the "arithmetic Nullstellensatz" I can find is in Gowers's bookGowers's book, stating that two polynomials with integral coefficients have the same roots mod every $m$ iff they differ by a sign. I would like to know the general form of this result, and see some reference where I can read about it and some applications (perhaps). All help is appreciated.
Fixed the link: now it goes directly to the definition (before it linked to a search with multiple items)
Jose Brox
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