Pseudo expression representing a solving operation.
| Decomposition | the type of the matrix or decomposition object | 
| Rhstype | the type of the right-hand side | 
This class represents an expression of A.solve(B) and most of the time this is the only way it is used.
Inherits Eigen::SolveImpl< Decomposition, RhsType, internal::traits< RhsType >::StorageKind >.
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