[Pw_forum] symmetry notation in phonon calculations

[Uri Argaman]

Dear QE users and developers
When I do a phonon calculations I see symmetry notations like this:

Representation     1      1 modes -A_1  D_1  S_1  To be done

What is the meaning of: A_1,D_1 and  S_1 ?

Thank you very much
Uri Argaman
Ben-Gurion University
Israel
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