2nd Order Diff Eqn. (complex roots)

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Homework Help Overview

The discussion revolves around a second-order differential equation, specifically focusing on the implications of having two solutions, y1 and y2, that exhibit maxima or minima at the same point within a given interval. Participants are exploring the relationship between the Wronskian and the linear independence of these solutions.

Discussion Character

  • Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to understand the role of the Wronskian in determining the linear independence of the solutions. Questions are raised about the significance of the Wronskian in the context of maxima and minima, and how it relates to the properties of the functions involved.

Discussion Status

The discussion is active, with participants seeking clarification on the Wronskian and its implications for the solutions of the differential equation. There is an exploration of the conditions under which y1 and y2 can be considered a fundamental set of solutions, particularly in relation to their behavior at critical points.

Contextual Notes

Participants are examining the implications of the solutions having maxima or minima at the same point, questioning how this affects their linear independence as indicated by the Wronskian. The discussion is framed within the constraints of the homework prompt, which requires a proof rather than a straightforward solution.

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Homework Statement


Prove that if y1 and y2 have maxima or minima at the same point in I, then they cannot be a fundamental set of solutions on that interval.


Homework Equations



Do I take the wronskian (determinant of y1, y1', y2, y2')? What would that tell me?

The Attempt at a Solution

 
Physics news on Phys.org
1) What is the Wronskian?

2) Why do you mention it here? What does the Wronskian have to do with differential equations?
 
The wronskian is a determinant that tells us whether a set of functions is linearly independent or not right? How does that relate to maxima/minima?
 
If y1 and y2 have maxima or minima at the same point, what are y1' and y2' there? What is the Wronskian at that point?
 

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