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that has the given symmetry group element, and forms either a dense
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matrix, or a sparse matrix in COO format.
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## `Symmetry` API
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This is a proposed API to low-level symmetries.
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### Data members
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+ `num_directions`: an integer -- the number of generators of the symmetry
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### Methods
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+ `representation`: create a `U(N)` representation of a symmetry group element.
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Returns either a dense `NxN` matrix or a sparse matrix in COO format
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### Discussion
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##### More general class of systems
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