4 problems

Let $\bT(z)$ be the transfer matrix and let $\tQ(z,\us)$ be the matrix obtained by removing the factor $\delta(q^n)$ from $\bQ(z,\us)$: … For $n=0$, the factor $\delta(q^n)$ is mea…

The generalized $Q$-operator for the 6-vertex model is defined by the matrix elements described above, which can contain the formal factor … When $s_1=s_2=0$, the factor…

Let $L$ be the level of an eigenvalue, let $ell$ be real, and let $A_{+}(s)$ and $A_{-}(s)$ be the entire functions associated with the eigenvalues of the operators…

Let $\mathcal Q(z)$ be the Q-operator constructed for the open spin chain, with matrix entries acting on the quantum space and depending on the spectral parameter $z$. Polynomialit…