In this case, we have Frac(R) = Prin(R) = formula_49, since two principal fractional ideals formula_46 and formula_51 are equal iff formula_52 is a unit in "R".
В этом случае Frac(R) = Prin(R) = formula_33, поскольку formula_30 и formula_35 совпадают тогда и только тогда, когда formula_36 — обратимый элемент "R".