Reduced ring

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This article is about a standard (though not very rudimentary) definition in commutative algebra. The article text may, however, contain more than just the basic definition
View a complete list of semi-basic definitions on this wiki
This article defines a property of commutative unital rings; a property that can be evaluated for a commutative unital ring
View all properties of commutative unital rings
VIEW RELATED: Commutative unital ring property implications | Commutative unital ring property non-implications |Commutative unital ring metaproperty satisfactions | Commutative unital ring metaproperty dissatisfactions | Commutative unital ring property satisfactions | Commutative unital ring property dissatisfactions
The property of being an ideal for which the quotient ring has this property is: radical ideal


Symbol-free definition

A commutative unital ring is said to be reduced if it satisfies the following equivalent conditions:

  • The nilradical of the ring is the zero ideal
  • There are no nilpotents other than the zero element
  • The zero ideal is a radical ideal

Definition with symbols

A commutative unital ring R is said to be reduced if it satisfies the following condition:

x^n = 0 \implies x = 0 for any x \in R

Relation with other properties

Stronger properties


Closure under taking subrings

Any subring of a commutative unital ring with this property, also has this property
View other subring-closed properties of commutative unital rings

Any subring of a reduced ring is reduced. That's because an element in the subring that is nilpotent, is also nilpotent in the whole ring.