Start with power 2
Let CMake find those packages

That might make it possible to compile all this on Windows. Not.
Shorten it a bit
Write eigenvalues to file
Use iomanip for neater output
Improve GEVP situation
Only create files that are non-empty
Calculate even and odd eigenvalues
Rename index
Put settings into correlations
Empty line
Try something
Fix debug, calculate different matrices
Print report into correlations
Compute correlations to tau = 4
Put Eigen3 into CMakeLists
Gutachter auf Seite 2
Rename option
Start with extraction of C_11
Different fit, reverse sort