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Which number systems constitute a group ring domain?
Integer, rational number, real number, complex number

The concept of group can be understood as follows: a set and binary operations defined on this set satisfy the four axioms of group, namely, closure, associativity, identity and anti-element. Ring is just another operation based on addition of commutative law and group, and the condition of field is stronger (except 0 yuan invertibility). The common ones are generally number fields, that is, integers, rational numbers, real numbers and complex numbers.