pub fn add<I: Index, E: ComplexField, LhsE: Conjugate<Canonical = E>, RhsE: Conjugate<Canonical = E>>(
lhs: SparseColMatRef<'_, I, LhsE>,
rhs: SparseColMatRef<'_, I, RhsE>,
) -> Result<SparseColMat<I, E>, FaerError>
pub fn add<I: Index, E: ComplexField, LhsE: Conjugate<Canonical = E>, RhsE: Conjugate<Canonical = E>>(
lhs: SparseColMatRef<'_, I, LhsE>,
rhs: SparseColMatRef<'_, I, RhsE>,
) -> Result<SparseColMat<I, E>, FaerError>