Quantum current operators (III): Commutative quantum current operators, semi-infinite construction and functional models

We construct a commutative current operator $\bar x^+(z)$ inside $U_q(\hat{\frak sl}(2))$. With this operator and the condition of quantum integrability on the quantum current of $U_q(\hat{\frak sl}(2))$, we derive the quantization of the semi-infinite construction of integrable modules of $\hat{\frak sl}(2)$ with the current operator $e(z)$ of $\hat{\frak sl}(2)$. The quantization of the functional models for $\hat{\frak sl}(2)$ are also given.

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