# How do you find the Wronskian of y1 and y2?

## How do you find the Wronskian of y1 and y2?

W[y1, y2](x) = y1(x)y2(x) − y2(x)y1(x) is called the Wronskian of y1, y2. We use the notation W[y1, y2](x) to emphasize that the Wronskian is a function of x that is determined by two solutions y1, y2 of equation (H).

### Why is the Wronskian important?

One of the greatest advantages of the wronskian is that it can be used with higher order differential equations, and so, for any nth order differential equation, as long as you know n-1 solutions, the wronskian aids in solving for the last general solution while adding information on the rest of them, such as linear …

#### Why do we need Wronskian?

The reason that the Wronskian can be used to determine linear dependence is because if a group of functions are linearly dependent then so are their nth derivatives.

What do you mean by Wronskian?

Definition of Wronskian : a mathematical determinant whose first row consists of n functions of x and whose following rows consist of the successive derivatives of these same functions with respect to x.

What is the Wronskian of XX 2?

Wikipedia says wronskian of x|x| and x2 is identically zero.

## Is it possible to have a zero Wronskian?

It DOES NOT say that if W (f,g)(x) = 0 W ( f, g) ( x) = 0 then f (x) f ( x) and g(x) g ( x) are linearly dependent! In fact, it is possible for two linearly independent functions to have a zero Wronskian! This fact is used to quickly identify linearly independent functions and functions that are liable to be linearly dependent.

### Is the Wronskian linearly dependent?

Now compute the Wronskian. Now, this does not say that the two functions are linearly dependent! However, we can guess that they probably are linearly dependent. To prove that they are in fact linearly dependent we’ll need to write down (1) (1) and see if we can find non-zero c c and k k that will make it true for all x x.

#### What is the Wronskian used for?

In the previous section we introduced the Wronskian to help us determine whether two solutions were a fundamental set of solutions. In this section we will look at another application of the Wronskian as well as an alternate method of computing the Wronskian.

How do you use the Wronskian to prove differentiability?

This is where the Wronskian can help. Given two functions f (x) f ( x) and g(x) g ( x) that are differentiable on some interval I. If W (f,g)(x0) ≠ 0 W ( f, g) ( x 0) ≠ 0 for some x0 x 0 in I, then f (x) f ( x) and g(x) g ( x) are linearly independent on the interval I.