Sarymsakov-Type Semigroups With Support Dominance and Nested Mixing Cores

Shun-Pin Hsu

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arXiv · 2609.05050

Sarymsakov-Type Semigroups With Support Dominance and Nested Mixing Cores

Shun-Pin Hsu

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Abstract

This note develops three multiplication-closed families of stochastic matrices for consensus under arbitrary switching. The first is a support-dominance enlargement of an earlier power-generated construction, in which exact support-pattern matching is relaxed to a dominance-type condition without losing closure under multiplication. The second is a fixed-core class with an exact uniform scrambling horizon and corresponding convergence-rate guarantees for switching products. The third and main contribution is the almost Sarymsakov class, obtained by allowing variable mixing-core dimensions under suitable structural conditions. This new semigroup class properly contains the classical Sarymsakov class and admits a dimension-only scrambling-horizon bound. Examples illustrate the necessity of the proposed structural assumptions and clarify the sharpness or limitations of the derived bounds.

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Shun-Pin Hsu. 2026-09-04. Sarymsakov-Type Semigroups With Support Dominance and Nested Mixing Cores. https://arxiv.org/abs/2609.05050

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