Definition(Integral closure): Let $R$ be a ring and $I$ an ideal of $R$. An element $x$ is said to be integral over $I$ if $x$ satisfies a monic equation $x^n + i_1x^{n−1} + ··· + i_n = 0$ such that $i_j ∈ I^j$

Let $ R $ be a ring and $ I $ ideals of $ R $ and $ I $ be a finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.

Definition(Integral closure): Let $R$ be a ring and $I$ an ideal of $R$. An element $x$ is said to be integral over $I$ if $x$ satisfies a monic equation $x^n + i_1x^{n−1} + ··· + i_n = 0$ such that $i_j ∈ I^j$ .

Let $ R $ be a ring and $ I $ ideals of $ R $ and $ I $ be a finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.

Let $ R $ be a ring and $ I $ ideals of $ R $ and $ I $ be a finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.

Definition(Integral closure): Let $R$ be a ring and $I$ an ideal of $R$. An element $x$ is said to be integral over $I$ if $x$ satisfies a monic equation $x^n + i_1x^{n−1} + ··· + i_n = 0$ such that $i_j ∈ I^j$

Let $ R $ be a ring and $ I $ ideals of $ R $ and $ I $ be a finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.

Definition (Reduction Ideal). Let $ I $ and $ J $ be ideals of $ R $. Then $ J $ is called a reduction of $ I $ iff $ J \subseteq I $ and there exists an $ n \in \mathbb{N} $ such that $ I^{n} = J I^{n - 1} $.

Let $ R $ be a ring and $ I,J $ ideals of $ R $ with $ J \subseteq I $ and $ I $ finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.

Let $ R $ be a ring and $ I $ ideals of $ R $ and $ I $ be a finitely generated.

Questions:

1. The integral closure of $ \text{rad}(I) $ is equal to the radical of the integral closure of $ I $.

2. The integral closure of a homogeneous ideal is homogeneous.