For tridiagonal pairs, the raising and lowering maps defined by the eigenspaces of A* and by the split decomposition are intertwined by a single bijection, with explicit formulas and rank consequences.
The algebra $U_q({\mathfrak{sl}_2})$ in disguise
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abstract
We discuss a connection between the algebra $U_q({\mathfrak{sl}_2})$ and the tridiagonal pairs of $q$-Racah type. To describe the connection, let $x,y^{\pm 1},z$ denote the equitable generators for $U_q({\mathfrak{sl}_2})$. Let $U^\vee_q$ denote the subalgebra of $U_q({\mathfrak{sl}_2})$ generated by $x,y^{-1},z$. Using a tridiagonal pair of $q$-Racah type we construct two finite-dimensional $U^\vee_q$-modules. The constructions yield two nonstandard presentations of $U^\vee_q$ by generators and relations. These presentations are investigated in detail.
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Raising and lowering maps for tridiagonal pairs
For tridiagonal pairs, the raising and lowering maps defined by the eigenspaces of A* and by the split decomposition are intertwined by a single bijection, with explicit formulas and rank consequences.