Study of Rota-Baxter Operators in Matrix $C^{\ast }$-Algebras Motivated by Toeplitz Structures, and Applications to Sliding Mode Control

Abstract

This paper studies Rota-Baxter operators on the matrix $C^{\ast }$-algebra $M_n(\mathbb{C})$, motivated by the discrete Toeplitz algebra (whose role is purely heuristic; see Remark~\ref{rem:toeplitz_scope}). We provide a structural classification of such operators compatible with the $C^{\ast }$-norm, analyze their induced Lie brackets, and apply them to deform system matrices in discrete-time delayed systems under sliding mode control. Lyapunov-based Bilinear Matrix Inequality conditions, together with a tractable linear reformulation via $Q=X^{-1}$, guarantee asymptotic stability on the sliding manifold and ${\mathcal{L}}_2$-gain stability. The effective gain from uncertainty $\delta$ to state $x$ is $\gamma /\sqrt{\mu }$ with $\mu ={\lambda }_{\min }(-\mathcal{M})>0$ determined \emph{a posteriori}; minimizing $\gamma$ alone does not minimize this bound, which holds under zero extended initial conditions ($V_0=0$). We work under the standing assumption $m=n$ (square actuation); a supplementary non-degenerate example with $m=1$, $n=2$ illustrates LMI feasibility with $\Pi \ne 0$. All algebraic results are proved directly in $M_n(\mathbb{C})$; no infinite-dimensional reduction is used.