Let *\mathsf{B}_1* be the polynomial ring *\mathbb{C}[a^{\pm1},b]* with the structure of a complex Hopf algebra induced from its interpretation as the algebra of regular functions on the affine linear algebraic group of complex invertible upper triangular 2-by-2 matrices of the form *\left( \begin{smallmatrix} a&b\\0&1 \end{smallmatrix}\right)*. We prove that the universal... Show more

July 21, 2020

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