Mean Value Theorem for Nonlinear Equations in R^n

In summary, the conversation discusses a problem of finding a root for a system of two nonlinear equations. The person asking for help suggests using the mean value theorem, but is unsure if it applies in this situation. Another person points out that the mean value theorem is not true in multiple dimensions and clarifies that there is no real solution for the given equation. The original person then gives an example of a potential root and asks for help in showing that there exists at least one root. They also provide equations and potential roots as attachments.
  • #1
steffka
2
0
Can someone help me... i need to show, that a system of 2 nonlinear equations
has a root. I think it is possible to use something like "mean value theorem". But i can not find any mean value theorem for R^n -> R^n.
 
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  • #2
the mean value theorem is not true in multiple dimensions, and unless you can be more specific your problem as stated is false, there is no real solution to

x^2+y^2=1

irrespective of the second equation over R, so are you talking about C?
 
  • #3
matt grime said:
the mean value theorem is not true in multiple dimensions, and unless you can be more specific your problem as stated is false, there is no real solution to

x^2+y^2=1
Hmmm, ... Yes, it does... x = 0, y = 1 is one example.
The one does not have real root is x^2 + y^2 = -1.
Viet Dao,
 
  • #4
sorry, meant it to be -1 not 1.
 
  • #5
correction resp. specification

I have two equations (nonlinear) with two variles. With some aproximative methods I get some potential roots (but not exact), so i know (or hope) there are some.
I need to show, that there exists at least one root.
I thought that somethinq like mena value theorem could help.

In attachment are equations and also the potential roots.
(the root x=0 and y=0 is trivial, but i need some other)
 

Attachments

  • equations.pdf
    12.7 KB · Views: 262

What is the Mean Value Theorem for Nonlinear Equations in R^n?

The Mean Value Theorem for Nonlinear Equations in R^n is a mathematical concept that states that if a function is continuous on a closed interval [a,b] and differentiable on the open interval (a,b), then there exists a point c in (a,b) where the function's derivative is equal to the average rate of change of the function over the interval [a,b]. This theorem is an extension of the Mean Value Theorem for one-dimensional functions to higher dimensions.

What is the significance of the Mean Value Theorem for Nonlinear Equations in R^n?

The Mean Value Theorem for Nonlinear Equations in R^n is important because it allows us to prove the existence of critical points (points where the function's derivative is equal to 0) for nonlinear functions in multiple dimensions. It also provides a useful tool for finding optimal solutions in optimization problems.

How is the Mean Value Theorem for Nonlinear Equations in R^n different from the Mean Value Theorem for one-dimensional functions?

The main difference between the two theorems is that the Mean Value Theorem for Nonlinear Equations in R^n applies to functions in multiple dimensions, while the Mean Value Theorem for one-dimensional functions only applies to functions in one dimension. Additionally, the Mean Value Theorem for Nonlinear Equations in R^n requires the function to be continuous and differentiable on a closed interval, while the Mean Value Theorem for one-dimensional functions only requires differentiability on an open interval.

Can the Mean Value Theorem for Nonlinear Equations in R^n be extended to complex-valued functions?

Yes, the Mean Value Theorem for Nonlinear Equations in R^n can be extended to complex-valued functions. However, the theorem requires the function to be differentiable on a closed interval in the complex plane. This extension is useful in complex analysis, where the concept of differentiability is more general than in real analysis.

What are the applications of the Mean Value Theorem for Nonlinear Equations in R^n?

The Mean Value Theorem for Nonlinear Equations in R^n has various applications in mathematics and physics. It is used to prove the existence of critical points in optimization problems, to prove the convergence of certain numerical methods, and to study the behavior of nonlinear functions in multiple dimensions. This theorem also has applications in the study of fluid dynamics, where it is used to analyze the flow of fluids in different directions.

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