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|Photo credit: Patrick Kik|
Mice have only 13 pairs of ribs. [Post]
"Remarkably, it turns out that for N = 13 the set of operators of 'exceptional' type (4) is empty, i.e., any Hamiltonian operator of order N = 13 can be taken by a contact transformation to an operator of type (1), (2) or (3)! We conjecture that the same holds for all N > 13." Reference: On Classification of Poisson Vertex Algebras by Alberto De Sole, Victor Kac, and Minoru Wakimoto. [Post]