Projectors #6
Description
Projectors are non-trivial in non-orthogonal spaces, cf
- Soriano, M., & Palacios, J. J. (2014). Theory of projections with
nonorthogonal basis sets: partitioning techniques and effective
hamiltonians. Physical Review B, 90(7),
075128. http://dx.doi.org/10.1103/physrevb.90.075128
It could be useful to implement them in CompactBases.jl.