RECURSION OPERATORS AND HIERARCHIES OF mKdV EQUATIONS RELATED TO THE KAC-MOODY ALGEBRAS D-4((1)), D-4((2)), AND D-4(3)

Gerdjikov, VS; Stefanov, AA; Iliev, ID; Boyadjiev, GP; Smirnov, AO; Matveev, VB; Pavlov, MV

Gerdjikov, VS (corresponding author), Bulgarian Acad Sci, Inst Math & Informat, Sofia, Bulgaria.; Gerdjikov, VS (corresponding author), Natl Res Nucl Univ MEPHI, Moscow, Russia.; Gerdjikov, VS (corresponding author), New Bulgarian Univ, Inst Adv Phys Studies, Sofia, Bulgaria.

THEORETICAL AND MATHEMATICAL PHYSICS, 2020; 204 (3): 1110

Abstract

We construct three nonequivalent gradings in the algebra D-4 similar or equal to so(8). The first is the standard grading obtained with the Coxeter au......

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