# BookRiff

If you don’t like to read, you haven’t found the right book

## Is F_P algebraically closed?

So first of all, there’s only one algebraically closed field of characteristic p that you should think about for the sake of intuition, the algebraic closure K of F_p. And that’s very easy, it’s just the limit of the finite fields of order p^n as n goes to infinity.

## Are complex numbers algebraically closed?

Equivalently (by definition), the theorem states that the field of complex numbers is algebraically closed. The theorem is also stated as follows: every non-zero, single-variable, degree n polynomial with complex coefficients has, counted with multiplicity, exactly n complex roots.

Are algebraic numbers closed under addition?

The set of algebraic numbers is closed under addition, subtraction, multiplication and division. The set of algebraic integers is closed under addition, subtraction and multi- plication, but not division. 2. The root of a polynomial whose coefficients are algebraic numbers (resp., algebraic integers) is one also.

### Is C an algebraic closure of Q?

C is not an algebraic extension of Q, so by definition of algebraic closure it cannot be an algebraic closure of Q. The fact that this is a transcendental extension can be stated by proving, for instance, that e or π are not algebraic.

### Is an algebraic extension of an algebraic extension algebraic?

In abstract algebra, a field extension L/K is called algebraic if every element of L is algebraic over K, i.e. if every element of L is a root of some non-zero polynomial with coefficients in K. Field extensions that are not algebraic, i.e. which contain transcendental elements, are called transcendental.

How do you check if a number is an algebraic integer?

Start with an initial guess G for O. Compute ΔG. For each prime p whose square devides ΔG, test all numbers of the form (I) to see which are algebraic integers. If any new integers arise, enlarge G to a new G′ by adding a new number.