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## Main Question or Discussion Point

Dear All,

I would like to know what type of solver packages can be used for solving the Large scale eigen problems, implemented in the Fortran language. Especially the simultaneous, subspace, ritz vectors, Lanczos etc.. methods is a must in the package. Does any of you aware of such packages ?

Your entry point will be appreciated?

Regards,

I would like to know what type of solver packages can be used for solving the Large scale eigen problems, implemented in the Fortran language. Especially the simultaneous, subspace, ritz vectors, Lanczos etc.. methods is a must in the package. Does any of you aware of such packages ?

Your entry point will be appreciated?

Regards,