Question: here are the notes : In particular, every integral domain contains as a subring either Z = Z/(0) (if char R = 0) or Z/(p)

here are the notes : In particular, every integral domain contains as a subring either Z = Z/(0) (if char R = 0) or Z/(p) if p = char R > 0 is a non-zero prime. This subring is sometimes called the characteristic subring of R

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