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:**

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

The integral closure of a homogeneous ideal is homogeneous.