The comultiplication of modified quantum affine ${\mathfrak{sl}}_n$

Qiang Fu

Let $\dot{\mathbf{U}}({\widehat{\mathfrak{sl}}}_n)$ be the modified quantum affine ${\mathfrak{sl}}_n$ and let $\mathbf{U}({\widehat{\mathfrak{sl}}}_N{)}^{+}$ be the positive part of quantum affine $\frak{…