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Mathematics
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Algebraic Number Theory
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Definitions
Definitions
Definitions regarding ideals in rings.
📜
The statement of the theorem
An ideal
I
I
I
of a ring
R
R
R
is a subring such that for all
r
∈
R
r \in R
r
∈
R
and
x
∈
I
x \in I
x
∈
I
,
r
x
∈
I
rx \in I
r
x
∈
I
and
x
r
∈
I
xr \in I
x
r
∈
I
.