It is common to use rotation-inversion axes (rather than rotation-reflection axes) to classify the symmetry of crystals. Any Sn axis is equivalent to a rotation-inversion axis (symbolized by p) whose order p may differ from n. A rotation-inversion operation consists of rotation by 2Ï€/p radians followed by inversion. Show that

Thus we have the following correspondence:

Give the next three pairs of entries in this table.

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3 1