public interface Field<S> extends Ring<S>, Group.Multiplicative<S>, Operation.Subtraction<S>, Operation.Division<S>
A field is a commutative ring (even the multiplication operation) with notions of addition, subtraction, multiplication, and division. Any field may be used as the scalars for a vector space, which is the standard general context for linear algebra.
A division ring is a ring in which division is possible. Division rings differ from fields only in that their multiplication is not required to be commutative. In terms of a Java interface/class there is no need to differentiate between a field and a division ring.
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