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3+1D to 3D group transformation for commensurate modulation
Modulation vector q=(D1/N1, D2/N2, D3/N3), or D/N if there is only one non-zero component.
3D derivatives inherit basis of parental (3+1)D group.
To obtain
specific group orientation
and symbol a basis transformation
might be necessary.
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Constraints of t level. Variable n stands for any integer.
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