Maximizing the Isoperimetric Problem with Integral Constraints | MathWorld

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In summary, the isoperimetric problem involves finding an object with the largest area and equal perimeter, and the integral constrained by the arc length must be maximized. This is related to the Calculus of Variations, and the brachistochrone problem shows that the shortest path is not always a straight line. The Euler Lagrangian is equal to -u"/(1+(u')^2)^(3/2) on page 1163, which may differ from what was calculated due to a possible typo.
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HACR
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Homework Statement


The isoperimetric problem is of the finding the object that has the largest area with the equal amount of perimeters; however, how does the integral constrained by the arc length get maximized? http://mathworld.wolfram.com/IsoperimetricProblem.html


Homework Equations





The Attempt at a Solution


...finding a point at which the integral is like finding the max and min of a function of two variables...
 
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  • #2
HACR said:

Homework Statement


The isoperimetric problem is of the finding the object that has the largest area with the equal amount of perimeters; however, how does the integral constrained by the arc length get maximized? http://mathworld.wolfram.com/IsoperimetricProblem.html

The Attempt at a Solution


...finding a point at which the integral is like finding the max and min of a function of two variables...

The general subject is Calculus of Variations. One place to read about it is here:

http://www.google.com/url?sa=t&rct=...sg=AFQjCNGZoq3YfZweM8ZFKBWuB062RSvkZQ&cad=rja
 
  • #3
It says the shortest path is the straight line; however, the brachistochrone problem proves that it is actually a curved line on which a stone could accelerate more. OK, brachistochrone problem is discussed. But why is on page 1163, the Euler Lagrangian equal to [tex] -\frac{u"}{(1+(u')^2)^{\frac{3}{2}}}[/tex]? I got -u"+(u')^{2}u" for numerator.
 
Last edited:

1. What is the isoperimetric problem?

The isoperimetric problem is a mathematical optimization problem that involves finding the shape with the maximum area for a given perimeter. In other words, it seeks to find the most efficient way to enclose a given area.

2. What are integral constraints in the isoperimetric problem?

Integral constraints refer to restrictions on the shape or size of the enclosed area in the isoperimetric problem. These constraints can take the form of equations or inequalities involving integrals.

3. Why is it important to maximize the isoperimetric problem with integral constraints?

Maximizing the isoperimetric problem with integral constraints has practical applications in various fields such as physics, engineering, and biology. It can help determine the most efficient shape for a given perimeter, which can have significant implications for design and optimization.

4. What is the approach to solving the isoperimetric problem with integral constraints?

The approach to solving the isoperimetric problem with integral constraints involves using the calculus of variations. This involves finding the critical points of a functional that represents the isoperimetric problem, and then using these points to determine the optimal solution.

5. What are some examples of integral constraints in the isoperimetric problem?

Some examples of integral constraints in the isoperimetric problem include fixing the enclosed area to a specific value, constraining the perimeter to be a certain length, or imposing a restriction on the shape of the enclosed area, such as requiring it to be convex or smooth.

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