Improve check of the Biharmonic matrix

davidkleiven / APAL

Alloy Phasefield Abstraction Layer

MIT License

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Open davidkleiven opened 5 years ago

davidkleiven commented 5 years ago

Improve the check to check for exact match of the biharmonic matrix and the one obtained by allying the Laplacian matrix twice.

davidkleiven commented 5 years ago

Check positive definiteness.

davidkleiven commented 5 years ago

Don't think it is positive definite in the periodic form. Think it is only positive definite when Dirichlet boundary conditions are imposed.