Confirming Wronskian Determinants with Basic Functions

In summary, a Wronskian determinant is a mathematical tool used to determine the linear independence of a set of functions in linear algebra. It is calculated by taking the determinant of a matrix formed by the first derivatives of the functions and can be used to find solutions to systems of differential equations. The value of a Wronskian determinant indicates whether the functions are linearly dependent or independent. It is also used in various fields of science, such as physics, engineering, and economics, and is particularly useful in the study of quantum mechanics.
  • #1
sapiental
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Homework Statement



Hi, could someone please confirm my results. I just put my answers because the procedure is so long. let me know if you get the same results.

1) Wronskian(e^x, e^-x, sinh(x)) = 0

2) Wronskian(cos(ln(x)), sin(ln(x)) = 1/x * [cos^2(ln(x)) + sin^2(ln(x))] = 1/x

thanks in advance:smile:
 
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  • #2
The one is super easy. sinh(x) is a linear combination of e^x and e^(-x). So 0. You don't even have to compute anything. And you are right on the second one as well.
 

1. What is a Wronskian determinant?

A Wronskian determinant is a mathematical tool used in linear algebra to determine the linear independence of a set of functions. It takes the form of a square matrix and is often used in the study of differential equations.

2. How is a Wronskian determinant calculated?

The Wronskian determinant is calculated by taking the determinant of a matrix formed by the first derivatives of the functions in question. This can be done using the cofactor expansion method or by using row operations to reduce the matrix to upper triangular form.

3. What does the value of a Wronskian determinant indicate?

If the Wronskian determinant is equal to zero, it indicates that the functions are linearly dependent. If it is non-zero, it indicates that the functions are linearly independent. This is useful in solving systems of differential equations.

4. Can a Wronskian determinant be used to find solutions to differential equations?

Yes, the Wronskian determinant can be used to find a fundamental set of solutions to a system of differential equations. By solving for the Wronskian determinant and its corresponding functions, one can then use these solutions as a basis to find the general solution to the system.

5. In what other fields of science is the Wronskian determinant used?

The Wronskian determinant is used in many fields of science, including physics, engineering, and economics. It is particularly useful in the study of quantum mechanics, where it is used to determine the energy states of particles in a potential well.

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