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Reference.org
Viability theory
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<p>Viability theory is an area of mathematics that studies the evolution of <a href="/facts/Dynamical_systems/782gREl5">dynamical systems</a> under constraints on the system <a href="/facts/State_space_(controls)/Jf4EanCP">state</a>. It was developed to formalize problems arising in the study of various natural and social phenomena, and has close ties to the theories of <a href="/facts/Optimal_control/9SmcQHjJ">optimal control</a> and <a href="/facts/Set-valued_analysis/WH5ua6BL">set-valued analysis</a>. </p>