Ring
Consider set
where addition and multiplication are defined, satisfying the following conditions:
- Commutative group with respect to addition
- Associative with respect to multiplication
- Multiplication is distributive over addition
- Existence of the unit element for multiplication
Commutative ring
:Additive group
:Endomorphism setConsidering
,If the sum
is defined as 
and the product 
is defined as 
,
then 
is a ring.[0]Top