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	Nicolas Maurice Arthus	Arthus Reaction	Arthus Charcot Leyden Crystals	Artiguism	José Gervasio Artigas
Emil Artin	Artin Reciprocity Law	Artin Approximation Theorem	Gustav Asboe-Hansen	$Artstein's theorem states that a nonlinear dynamical system in the control-affine form which has a differentiable control-Lyapunov function if and only if it admits a regular stabilizing feedback u(x), that is a locally Lipschitz function on Rn\{0}. The original proof of Zvi Artstein proceeds by a nonconstructive argument. In 1989 Eduardo D. Sontag provided a constructive version of this theorem explicitly exhibiting the feedback.$ Artstein's Circles	Zvi Artstein
Cesare Arzelà	Arzela Ascoli Theorem	Karl Wolfgang Ascher	Selmar Aschheim	Aschheim Zondek Test	Bernhard Zondek
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