ANSWER
Taleb doesn’t ground his claim in a single formal theory but builds an interdisciplinary heuristic framework drawing from fields such as evolutionary biology, complexity theory, and toxicology. For example, he parallels the idea of hormesis from toxicology—where small doses of stressors can trigger beneficial adaptive responses—with evolutionary processes in which organisms become fitter through selective challenges. Similarly, complexity theory shows how nonlinear systems can evolve and improve when exposed to variable stress levels. Rather than offering a unified mathematical model for antifragility, Taleb’s approach synthesizes these insights to argue that certain systems not only withstand disorder but harness it for growth, provided that the stress remains within a beneficial range.