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arXiv · 2607.26167

Gelation and Positivity of Solutions to the Discrete Oort--Hulst--Safronov Coagulation Equation

Mashkoor Ali
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Abstract

Motivated by the recent deterministic approach of Fournier~\cite{F2025} to gelation for the continuous Smoluchowski coagulation equation, we adapt his method to the discrete Oort--Hulst--Safronov (OHS) coagulation system. We show that under a suitable condition on the coagulation kernel, every solution with finite initial mass loses mass in finite time, and we give an explicit bound on the gelation time. We also prove gelation in the critical logarithmic case and provide a sufficient condition for mass conservation. Finally, we study the positivity of solutions and show that, for any positive time, a cluster size has positive concentration if and only if it is at least as large as the smallest cluster present initially.

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Mashkoor Ali. 2026-07-28. Gelation and Positivity of Solutions to the Discrete Oort--Hulst--Safronov Coagulation Equation. https://arxiv.org/abs/2607.26167

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