Semi-classical twists for sl(3) and sl(4) boundary r-matrices of Cremmer-Gervais type
M. Samsonov
Abstract
We obtain explicit formulas for the semi-classical twists deforming the coalgebraic structure of U(sl(3)) and U(sl(4)). In rank 2 and 3 the corresponding universal R-matrices quantize the boundary r-matrices of Cremmer-Gervais type defining Lie Frobenius structures on the maximal parabolic subalgebras in sl(n).
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