arXiv2026
Control systems with tensor-valued state transitions require a product that specifies both how coefficients act on each frontal slice and how different slices interact. This paper develops a t-semi-tensor product (t-STP) on cubic matrices that retains the circular coupling of the t-product while allowing rectangular coefficient slices to act on a fixed state space. The construction combines the dimension-keeping semi-tensor product (DK-STP) bridge with circular convolution, overcoming the absence of cross-slice coupling in a slice-wise DK-STP. It provides a compact coefficient description of a structured class of dynamical operators, with fewer stored entries when the coefficient slices have fewer columns than rows. For a fixed number of frontal slices, we establish associative algebra and module structures and describe the associated Lie algebra and Lie groups. These structures make coefficient composition and exponential evolution consistent, while equivalent classical matrix realizations connect the tensor formulation to control analysis of cubic matrix-based dynamics. A specified supply-network game illustrates how the construction organizes interacting chain flows, reproduces the classical trajectories, and supports a globally convergent payoff-gradient adjustment law with explicit damping. The example quantifies coefficient storage while clarifying that the state dimension is unchanged and that the same economy is available to a classical implementation retaining the factorization.