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Birational solutions to the set-theoretical 4-simplex equation. (English) Zbl 1518.39007

Summary: The 4-simplex equation is a higher-dimensional analogue of Zamolodchikov’s tetrahedron equation and the Yang-Baxter equation which are two of the most fundamental equations of mathematical physics. In this paper, we introduce a method for constructing 4-simplex maps, namely solutions to the set-theoretical 4-simplex equation, using Lax matrix refactorisation problems. Employing this method, we construct 4-simplex maps which at a certain limit give tetrahedron maps classified by R. M. Kashaev et al. [Theor. Math. Phys. 117, No. 3, 1402–1413 (1998; Zbl 0941.82018); translation from Teor. Mat. Fiz. 117, No. 3, 370–384 (1998)]. Moreover, we construct a Kadomtsev-Petviashvili type of 4-simplex map. Finally, we introduce a method for constructing 4-simplex maps which can be restricted on level sets to parametric 4-simplex maps using Darboux transformations of integrable PDEs. We construct a nonlinear Schrödinger type parametric 4-simplex map which is the first parametric 4-simplex map in the literature.

MSC:

39A36 Integrable difference and lattice equations; integrability tests
16T25 Yang-Baxter equations
35Q55 NLS equations (nonlinear Schrödinger equations)
37K35 Lie-Bäcklund and other transformations for infinite-dimensional Hamiltonian and Lagrangian systems

Citations:

Zbl 0941.82018

References:

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