Variational methods conjugate points

In summary, to prove that two points are conjugate, you need to show that the ratio of the derivatives of y with respect to the parameters a and b is the same at both points. This can be done by taking derivatives and finding the ratio between them.
  • #1
braindead101
162
0
(a will be alpha and b will be beta)
Let y=y(x,a,b) be a general solution of Euler's equation, depending on two parameters a and b. Prove that if the ratio (subdifferential y/subdifferential a)/(subdifferential y/subdifferential b) is the same at the points, the points are conjugate.

I cannot find the theorem to use for this. i am suppose to take the derivative with respect to a and b and find the ratio. but i am looking for that something to take the derivative of.

As well, the definition of conjugate points is as follow:
The point a tilda (does not equal a) is said to be conjugate to the point a if the equation -d/dx(Ph')+Qh = 0 has a solution which vanishes for x=a and x=a tilda, but is not identically 0.

I have been looking over and over on the internet for this, I cannot show any work as I really do not know how to do it without the proper theorem.
 
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  • #2
Any help would be appreciated. To prove that the points are conjugate, you need to show that the equation -d/dx(Ph')+Qh = 0 has a solution which vanishes for both x=a and x=a tilda (where a tilda is not equal to a). You can do this by taking derivatives of y with respect to a and b and finding the ratio between them as you mentioned. Let's denote the derivatives of y with respect to a and b as y'a and y'b respectively. Then the ratio between them is given by: R = (y'a/y'b)If the ratio R is the same for both points x=a and x=a tilda, then this suggests that the equation -d/dx(Ph')+Qh = 0 has a solution which vanishes at both points. Therefore these points are conjugate.
 

Related to Variational methods conjugate points

1. What are variational methods conjugate points?

Variational methods conjugate points are a set of mathematical techniques used in optimization and calculus of variations. They are used to find the optimal path or trajectory for a given system by minimizing a functional.

2. How do variational methods conjugate points differ from other optimization techniques?

Variational methods conjugate points differ from other optimization techniques in that they use a functional approach, where the optimal path is found by minimizing a functional instead of a set of equations. This approach is particularly useful for problems with complex constraints or multiple variables.

3. What is the significance of conjugate points in variational methods?

Conjugate points play a crucial role in variational methods as they correspond to stationary points of the functional. These points are important as they are used to determine the optimal path or trajectory for the system being studied.

4. How are conjugate points calculated in variational methods?

Conjugate points are typically calculated using a set of differential equations known as the Euler-Lagrange equations. These equations are derived from the functional and can be solved to find the locations of the conjugate points.

5. What are some real-world applications of variational methods conjugate points?

Variational methods conjugate points have a wide range of applications in various fields such as physics, engineering, and economics. They are used to optimize trajectories for spacecraft, minimize energy consumption in power systems, and find the most efficient routes for transportation networks.

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