Expression of the inverse of another expression.
| XprType | the type of the expression we are taking the inverse | 
This class represents an abstract expression of A.inverse() and most of the time this is the only way it is used.
Inherits Eigen::InverseImpl< XprType, internal::traits< XprType >::StorageKind >.
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    https://eigen.tuxfamily.org/dox/classEigen_1_1Inverse.html