What are the rules for initial value problems?

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SUMMARY

The discussion centers on the nature of initial value problems (IVPs) in ordinary differential equations (ODEs). It is established that an IVP typically has either a unique solution or infinitely many solutions, aligning with the "Fredholm alternative." The conversation also clarifies that it is possible to have two distinct initial value problems yielding the same solution, contradicting the notion that two IVPs cannot share a single solution.

PREREQUISITES
  • Understanding of ordinary differential equations (ODEs)
  • Familiarity with initial value problems (IVPs)
  • Knowledge of the Fredholm alternative theorem
  • Basic concepts of uniqueness and existence of solutions in differential equations
NEXT STEPS
  • Study the Fredholm alternative theorem in detail
  • Explore the uniqueness and existence theorems for ODEs
  • Investigate examples of initial value problems with multiple solutions
  • Learn about the implications of having multiple IVPs with a common solution
USEFUL FOR

Mathematicians, students of differential equations, and educators seeking to deepen their understanding of initial value problems and their solutions.

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Why is it that you are able to have 1 initial value problem with 2 solutions, but not 2 initial value problems with 1 solution for an ODE?

Is there a theorem that states this?
 
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I have no idea what you are asking. What do you mean by "1 initial value problem with two solutions"? I was under the impression that an initial value problem either had a unique solution or had an infinite number of solutions. (That's basically a statement of the "Fredholm alternative"). On the other hand, as to "not 2 initial value problems with 1 solution for an ODE?", it's easy to make up two distinct intial value problems having the same solution. Is that not what you meant?
 

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