<p>The present article represents a step forward in the study of the following problem: If <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\mathbb {A}=(A_{1},A_{2})\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(\mathbb {H}=(H_{1},H_{2})\)</EquationSource> </InlineEquation> are Hopf braces in a symmetric monoidal category <Emphasis FontCategory="SansSerif">C</Emphasis> such that <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\((A_{1},H_{1})\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\((A_{2},H_{2})\)</EquationSource> </InlineEquation> are matched pairs of Hopf algebras, then we want to know under what conditions the pair <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\((A_{1}\bowtie H_{1},A_{2}\bowtie H_{2})\)</EquationSource> </InlineEquation> constitutes a new Hopf brace. We find such conditions for the pairs <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\((A_{1}\otimes H_{1},A_{2}\bowtie H_{2})\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\((A_{1}\bowtie H_{1},A_{2}\sharp H_{2})\)</EquationSource> </InlineEquation> to be Hopf braces, which are particular situations of the general problem described above, analyzing when these are cocommutative, leading to solutions to the Quantum Yang-Baxter equation. These results are applied to study when the Drinfeld’s Double gives rise to a Hopf brace.</p>

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About Hopf braces and crossed products

  • Ramón González Rodríguez,
  • Brais Ramos Pérez

摘要

The present article represents a step forward in the study of the following problem: If \(\mathbb {A}=(A_{1},A_{2})\) and \(\mathbb {H}=(H_{1},H_{2})\) are Hopf braces in a symmetric monoidal category C such that \((A_{1},H_{1})\) and \((A_{2},H_{2})\) are matched pairs of Hopf algebras, then we want to know under what conditions the pair \((A_{1}\bowtie H_{1},A_{2}\bowtie H_{2})\) constitutes a new Hopf brace. We find such conditions for the pairs \((A_{1}\otimes H_{1},A_{2}\bowtie H_{2})\) and \((A_{1}\bowtie H_{1},A_{2}\sharp H_{2})\) to be Hopf braces, which are particular situations of the general problem described above, analyzing when these are cocommutative, leading to solutions to the Quantum Yang-Baxter equation. These results are applied to study when the Drinfeld’s Double gives rise to a Hopf brace.