Talk:Biharmonic equation

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Mathematics rating:	Stub Class	Low Priority	Field: Algebra
Please update this rating as the article progresses, or if the rating is inaccurate. Click to show/hide comments. Please add to or update the comments to suggest improvements to the article. Geometry guy 19:06, 21 May 2007 (UTC)

Isn't the biharmonic the Laplacian of the Laplacian? In particular... shouldn't there be crossterms???

Fixed it. -Ryan

Shouldn't it be "Any harmonic function is biharmonic..." rather than "Any biharmonic function is harmonic..."? Consider f(x) = x^3. But then don't harmonic functions only need to be twice differentiable? I guess there's a regularity theorem that says that harmonic functions are automatically infinitely differentiable, so harmonic implies biharmonic.