Develops a systematic relaxation of ensemble N-representability for 1RDMs with partial information, solved via generalized Horn constraints plus weighted ensemble conditions, yielding a convex polytope for excited-state DFT.
Klyachko, Quantum marginal problem and represen- tations of the symmetric group, arXiv:0409113 (2004)
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Refining ensemble $N$-representability of one-body density matrices from partial information
Develops a systematic relaxation of ensemble N-representability for 1RDMs with partial information, solved via generalized Horn constraints plus weighted ensemble conditions, yielding a convex polytope for excited-state DFT.