Can Zero Be Considered an Eigenfunction?

  • Thread starter Thread starter pivoxa15
  • Start date Start date
  • Tags Tags
    Eigenfunction
Click For Summary
SUMMARY

The discussion confirms that the zero function, denoted as y(x)=0, does not qualify as an eigenfunction in the context of linear operators and ordinary differential equations (ODEs). It fails to satisfy the orthogonality relation, as the integral of zero over any interval results in zero, which does not fulfill the requirements for eigenfunctions. Furthermore, the zero vector cannot be considered an eigenvector since it implies a non-zero determinant of the associated matrix, contradicting the definition of eigenvalues and eigenvectors.

PREREQUISITES
  • Understanding of linear operators in functional analysis
  • Familiarity with eigenvalues and eigenvectors in linear algebra
  • Knowledge of ordinary differential equations (ODEs)
  • Concept of orthogonality in vector spaces
NEXT STEPS
  • Study the properties of linear operators in functional analysis
  • Explore the definitions and implications of eigenvalues and eigenvectors
  • Review the concept of orthogonality in the context of Hilbert spaces
  • Investigate the role of boundary conditions in ODE solutions
USEFUL FOR

Students and professionals in mathematics, particularly those studying linear algebra, functional analysis, and differential equations, will benefit from this discussion.

pivoxa15
Messages
2,250
Reaction score
1

Homework Statement


If y(x)=0 satisfies the ode and all the boundary conditions than does it count as the first eigenfunction?

The Attempt at a Solution


It wouldn't satisfy the orthogonality relation though? In that the integral of 0 and 0 is 0 even though the integral is over two eigenfunctions that are the same.
 
Physics news on Phys.org
A linear operator acting on the zero vector is always the zero vector. This doesn't count as 'eigen' behavior. Otherwise every linear operator would have zero eigenvalue. Read a carefully stated definition of eigenfunction.
 
Good point. I should always relate to linear algebra. The 0 vector is never an eigenvector as it would imply the determinant of the matrix is nonzero.

So the 0 function is never the eigenfunction.
 

Similar threads

  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
Replies
1
Views
2K
Replies
3
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 5 ·
Replies
5
Views
3K
Replies
3
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
Replies
1
Views
2K