Hi everyone,
in dolfinx is there a function or library able to find the eigenvalues and eigenfunction of linear operator?
I was thinking of solving the eigenvalue problem for the discretised version of the operator, coming from the weak formulation.

You need to define your weak form in DOLFINx as usual, then you need to assemble your matrices with PETSc, and then you can finally find the solutions of your problem with SLEPc (slepc4py).