D.E. Wronskian Method: Stuck trying to show L.I. and L.D. intervals

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SUMMARY

The discussion centers on the D.E. Wronskian method, specifically how to determine intervals of linear independence (L.I.) and linear dependence (L.D.) of functions. Participants clarify that functions are linearly independent on an interval if the Wronskian is nonzero anywhere within that interval. The Wronskian vanishes at specific points, namely 0 and 2/7, indicating that there are no positive length intervals where the functions are linearly dependent. The conversation emphasizes the importance of understanding the relationship between the Wronskian and linear independence in the context of solving differential equations.

PREREQUISITES
  • Understanding of the Wronskian determinant in differential equations
  • Knowledge of linear independence and dependence of functions
  • Familiarity with second-order and higher-order differential equations
  • Basic skills in solving algebraic equations
NEXT STEPS
  • Study the properties of the Wronskian in detail
  • Learn how to apply the Wronskian test to various functions
  • Explore examples of linear dependence and independence in differential equations
  • Investigate visual representations of the Wronskian and its implications
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Students and educators in mathematics, particularly those focused on differential equations, linear algebra, and anyone seeking to deepen their understanding of the Wronskian method and its applications in determining function relationships.

  • #61
Jeff12341234 said:
Well we got our tests back. The correct answer for part A was (-inf, 0) but he said any of the three intervals could've been used. It was L.I. on the intervals (-inf, 0) U (0, 2/7) U (2/7, inf). I got part A correct on the test.

Part B was really weird. The answer was "any interval that contained the two points" so (-inf, inf) could've been used. I got this part wrong.

Weird stuff..

I don't think the person that composed the questions and answers really understands that "linearly dependent" is different from "wronskian equals zero". The PlanetMath site seemed to have a similar delusion. Hopefully, you do. Someday you might get a test question from someone who does.
 

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