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Let $\Omega\subset R^d$ be a bounded, smooth domain. Consider $A=-\Delta$ subject to homogeneous Neumann boundary conditions in $L^p$-spaces. Does anybody know a good reference book on basic results like closedness and semigroup properties etc.?

Thanks for your help!

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There are many books about the $L^p$-theory of elliptic and parabolic equations covering, in particular the case of the Neumann Laplacian. See, for example,

D. D. Haroske and H. Triebel, Distributions, Sobolev spaces, elliptic equations, Zürich: European Mathematical Society, 2008;

N. V. Krylov, Lectures on elliptic and parabolic equations in Sobolev spaces, AMS, Providence, 2008.

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Have a look at Lunardi's book, it is more on the functional analytic questions you have:

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