Integrally closed domain

An **integrally closed domain** is a type of integral domain in which every element that is integral over the domain is already an element of the domain itself. To understand this concept, let's break it down: 1. **Integral Domain**: An integral domain is a commutative ring with no zero divisors and a multiplicative identity (usually denoted as 1). It also has the property that it is non-trivial (the ring is not the zero ring).