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Boundary from bulk integrability in three dimensions: 3D reflection maps from tetrahedron maps

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arxiv 2103.01105 v2 pith:NKPDWWJW submitted 2021-03-01 math-ph math.MPmath.QAnlin.SI

Boundary from bulk integrability in three dimensions: 3D reflection maps from tetrahedron maps

classification math-ph math.MPmath.QAnlin.SI
keywords equationmapsreflectionboundarymethodsolutionsolutionstetrahedron
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We established a method for obtaining set-theoretical solutions to the 3D reflection equation by using known ones to the Zamolodchikov tetrahedron equation, where the former equation was proposed by Isaev and Kulish as a boundary analog of the latter. By applying our method to Sergeev's electrical solution and a two-component solution associated with the discrete modified KP equation, we obtain new solutions to the 3D reflection equation. Our approach is closely related to a relation between the transition maps of Lusztig's parametrizations of the totally positive part of $SL_3$ and $SO_5$, which is obtained via folding the Dynkin diagram of $A_3$ into one of $B_2$.

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