Abstract
We study the stationary Focker-Planck equation Δu − div(u f) = 0 with a given vector field f of the class C ∞0 (R n) on the basis of a fixed point principle that generalizes the contraction mapping method. Next, we introduce a parameter in the equation and prove the unique solvability of the equation Δu − div(uγ f) = 0 with the parameter in the class of positive slowly increasing functions. We reveal the analytic dependence of the positive solution u on the parameter γ. Pointwise estimates for positive solutions are proved.
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Original Russian Text © A.I. Noarov, 2009, published in Differentsial’nye Uravneniya, 2009, Vol. 45, No. 2, pp. 191–202.
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Noarov, A.I. Unique solvability of the stationary Fokker-Planck equation in a class of positive functions. Diff Equat 45, 197–208 (2009). https://doi.org/10.1134/S0012266109020062
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DOI: https://doi.org/10.1134/S0012266109020062