Add example which demonstrates finding an eigenfunction and eigenvalue.

[jsilter]

Modulus Pull Request

Description

Implement Schrodingers equation for a 1D particle-in-a-box. Include a loss term for the inner product with another function (sine in this case), as a method of finding new eigenfunctions once existing ones have been found. Default configuration includes modes 1 & 2 as orthogonality functions, so should learn 3rd mode (sin 3 pi x).

Implement IntegralInteriorConstraint; very similar to IntegralBoundaryConstraint but for the interior region of geometries. Used for normalization constraint of wavefunction.

Checklist

• [X] I am familiar with the Contributing Guidelines.
• [ ] New or existing tests cover these changes.
• [X] The documentation is up to date with these changes.
• [X] The CHANGELOG.md is up to date with these changes.
• [ ] An issue is linked to this pull request.

Dependencies

No additional dependencies