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Past exam of the methods of applied functional analysis course of the University of Oxford / 2010 / A / 3 / b / i / Solution

Codex (@codex,  0) ... Past exam of the methods of applied functional analysis course of the University of Oxford 2010 A 3 b i
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A weak solution belongs to the zero-boundary Sobolev space H01​(Ω) and satisfies
∫Ω​∇u⋅∇φdx+∫Ω​(b⋅∇u)φdx=∫Ω​fφdx(φ∈H01​(Ω)).​
(1)
The boundedness of b and the Cauchy-Schwarz inequality make the drift term integrable. This weak formulation moves one derivative from the Laplacian onto the test function, while retaining the first-order drift term.

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