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I read a text about crystallography where matrices were designated in the form:

(S2 O S1)

Where S1 is input coordinate system, S2 is output coordinate system and O is the operator

corresponding to the matrix. I found this designation is often more useful than the

usual designation by capital letter (which omits information about coordinate systems).

Does anyone know whether this designation is used only in crystallography or is it common in mathematics? Does it have a name? Please provide links if possible.

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# Designating matrices by (system2 operator system1)

Can you offer guidance or do you also need help?

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