# Calculating Integrals with Hermite Polynomials

• alejandrito29
In summary, Hermite polynomials are a sequence of orthogonal polynomials named after the French mathematician Charles Hermite. They have many useful properties, including their ability to simplify the process of integration. The general formula for calculating integrals with Hermite polynomials involves expressing a function as a linear combination of the polynomials. Hermite polynomials are closely related to Gaussian functions, as they are the basis functions for the Gaussian probability distribution. They can also be used in multidimensional integration, known as multidimensional Hermite polynomials.

#### alejandrito29

Hello , i need to calculate the following integral

$$\int_{-\infty}^{\infty} x^4 H(x)^2 e^{-x^2} dx$$

i tried using the recurrence relation, but i don't go the answer

What's $H$? The Hermite polynomials have an index, i.e., $H_n$ with $n \in \mathbb{N}_0$.

## 1. What are Hermite polynomials?

Hermite polynomials are a sequence of orthogonal polynomials that are often used in mathematical analysis and physics. They are named after the French mathematician Charles Hermite and can be defined by the recurrence relation:

## 2. How are Hermite polynomials used in calculating integrals?

Hermite polynomials have many useful properties, one of which is their ability to be used in the process of integration. By expressing a function as a linear combination of Hermite polynomials, we can use their orthogonality and recurrence relations to simplify the process of integration.

## 3. What is the general formula for calculating integrals with Hermite polynomials?

The general formula for calculating integrals with Hermite polynomials is:
∫ f(x)e-x2/2Hn(x)dx = ∑ ckHk(x)
where ck is the kth coefficient of the function f(x) and Hk(x) is the kth Hermite polynomial.

## 4. What is the relationship between Hermite polynomials and Gaussian functions?

Hermite polynomials and Gaussian functions are closely related, as the Hermite polynomials are the basis functions for the Gaussian probability distribution. This means that any Gaussian function can be expressed as a linear combination of Hermite polynomials.

## 5. Can Hermite polynomials be used in multidimensional integration?

Yes, Hermite polynomials can be used in multidimensional integration. In this case, they are known as multidimensional Hermite polynomials and are defined by multiple recurrence relations. They are commonly used in the field of quantum mechanics to solve integrals in multiple dimensions.