Uniqueness of Solution for y' = y(siny) + x with Initial Value of f(0) = -1

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In summary, the given differential equation has a unique solution with the initial value of f(0) = -1. The partial derivative with respect to y is continuous on the given rectangle, ensuring uniqueness. It is also implied that f(x,y) is "Lischitz" in y, making it sufficient for uniqueness.
  • #1
cragar
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Homework Statement


y' = y(siny) + x does this have a unique solution ,
with the intial value of f(0)= -1

The Attempt at a Solution



the partial dervative with respect to y is
del(x)/del(y) = siny + cosy(y) this is continuous on the rectangle including
(0 , -1 ) so this is unique.

is this right
 
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  • #2
Yes, that is correct. Strictly speaking, for uniqueness you only requrire that f(x,y), in dy/dx= f(x,y), be "Lischitz" in y but that is implied by continuous derivative so that is sufficient.
 
  • #3
im just curious do you have your ph.d. in math
 

1. What is the "Uniqueness of dx equation"?

The "Uniqueness of dx equation" refers to the concept that for any given function, there is only one value of dx (the independent variable) that can be assigned to any given value of the function's derivative. This means that the dx equation is unique and cannot have multiple solutions.

2. Why is the "Uniqueness of dx equation" important in mathematics?

The "Uniqueness of dx equation" is important because it ensures that there is only one correct solution to a mathematical problem. This helps to avoid confusion and ensures the accuracy of mathematical calculations and equations.

3. How does the "Uniqueness of dx equation" relate to the concept of limits?

The "Uniqueness of dx equation" is closely related to the concept of limits because it helps to determine the behavior of a function as the value of dx approaches a certain point. The uniqueness of the dx equation ensures that there is a well-defined limit for a function, which is essential in many mathematical calculations and proofs.

4. Can the "Uniqueness of dx equation" be violated?

No, the "Uniqueness of dx equation" cannot be violated. This concept is a fundamental property of mathematical functions and equations, and it is always true. If a solution is found that violates the uniqueness of the dx equation, then it is not a valid solution.

5. How is the "Uniqueness of dx equation" applied in real-life situations?

The "Uniqueness of dx equation" is applied in various real-life situations, such as in engineering, physics, and economics. It is used to solve problems and make predictions based on mathematical models. For example, it can be used to determine the optimal production level for a manufacturing process or to calculate the trajectory of a projectile.

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