# KP or mKP : noncommutative mathematics of Lagrangian, by Boris A. Kupershmidt

By Boris A. Kupershmidt

This booklet develops a thought that may be considered as a noncommutative counterpart of the subsequent themes: dynamical platforms usually and integrable structures particularly; Hamiltonian formalism; variational calculus, either in non-stop house and discrete. The textual content is self-contained and contains a huge variety of routines. many alternative particular versions are analyzed commonly and motivations for the recent notions are supplied.

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Extra resources for KP or mKP : noncommutative mathematics of Lagrangian, Hamiltonian, and integrable systems

Example text

30. 12) becomes dtn(u) = Qonstnnuxun~l. 33. 28) becomes in the zero-dispersion limit dtn(u) = constnnun~1ux. 35. 22)): dtn{u) = const n <9(u n+1 ). 36) 2. 36))? 37. 38) where 00 7^0, 0 1 7 ^O , 0o^0i. 39) Let Y e Dev(C) be given the formula n Y{u) = J2^sUsu^un-s, 9seR, s=0 neN, n > 1. 40) Show that if [X, Y] = 0 then Y = 0. 41. 13) was discovered in 1915 by Bateman [Bat 1915]. History would be an excellent thing if only it were true. 6. T H E KORTEWEG-DE VRIES HIERARCHY The Universe is like a safe to which there is a combination, but the combination is locked up in the safe.

28) becomes in the zero-dispersion limit dtn(u) = constnnun~1ux. 35. 22)): dtn{u) = const n <9(u n+1 ). 36) 2. 36))? 37. 38) where 00 7^0, 0 1 7 ^O , 0o^0i. 39) Let Y e Dev(C) be given the formula n Y{u) = J2^sUsu^un-s, 9seR, s=0 neN, n > 1. 40) Show that if [X, Y] = 0 then Y = 0. 41. 13) was discovered in 1915 by Bateman [Bat 1915]. History would be an excellent thing if only it were true. 6. T H E KORTEWEG-DE VRIES HIERARCHY The Universe is like a safe to which there is a combination, but the combination is locked up in the safe.

2) is understood as the I x / matrix £1~. 10), dTrRes(Cn) ~ nTrRes ({dC)^'1). 1, that the W n 's are common conserved densities of all the mKP flows. 6) for the n t h flow of the mKP hierarchy in terms of the variational derivatives of W n +i. ^)) whence p , (n) = ? 7a) 2. 10) « G Z+. 6) of the n t h mKP flow. 12). In the first summand, since s < fc + 1, we must have j > i + 1; hence, j + l > i + 2>2. fc>n j,fc>o £ lz+2 + * z=_ -i-2 B. A. 15) constitute the desired pre-Hamiltonian form of the mKP hierarchy.