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+ `hamiltonian`: evaluate the Hamiltonian of the system. Given a sequence
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of representations for the generators of the symmetry group of the
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Hamiltonian, returns either a sparse matrix in COO format, or a dense
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matrix. The representations may be passed as a sequence of
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matrix. It would also be nice if we could simply pass the "momenta",
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for the abelian case, and have `exp[ i k R]` calculated.
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## `Symmetry` API
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