SEARCH Articles Figures Tables Equivalences for Improper Rotation Operations Ethane improper rotation operation Improper Improper Rotation, Sn Improper axis of rotation Improper rotation axes Improper rotation axis Improper rotation axis Sn Improper rotation operation Improper rotation operator Improper rotations definition N-fold improper rotation axis Rotation-reflection axis (improper Rotational axes, improper Symmetry improper rotation Symmetry improper rotation axis Symmetry operations improper rotation