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This paper shows that every finite non-degenerate involutive set theoretic solution (X,r) of the Yang–Baxter equation whose permutation group G(X,r) has cardinality which is a cube-free number is a multipermutation solution. Some properties of finite braces are also investigated. It is also shown that if A is a left brace whose cardinality is an odd number and (−a)⋅b=−(a⋅b) for all a,b∈A, then A is a two-sided brace and hence a Jacobson radical ring. It is also observed that the semidirect product and the wreath product of braces of a finite multipermutation level is a brace of a finite multipermutation level.
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- 1 Finished
1/06/13 → 31/05/18