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| class   | GenEigsSolver< Scalar, SelectionRule, OpType > | 
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| class   | GenEigsRealShiftSolver< Scalar, SelectionRule, OpType > | 
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| class   | GenEigsComplexShiftSolver< Scalar, SelectionRule, OpType > | 
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| class   | SymEigsSolver< Scalar, SelectionRule, OpType > | 
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| class   | SymEigsShiftSolver< Scalar, SelectionRule, OpType > | 
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Eigen solvers for different types of problems.