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Laplacian

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(1) Show u belongs to C^1(U), and calculate ux, uy.
(2) Calculate uxx, uyy, uxy and show that uxx and uyy are continuous in the whole disk, but u does not belong to C^2. Calculate f := - delta u.

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https://brainmass.com/math/numerical-analysis/laplacian-343921

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