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 May 30 revised Tables of Hypergeometric Functions stupid and embarrassing typo May 29 answered Tables of Hypergeometric Functions Mar 10 revised How does the method of Lagrange multipliers fail (in classical field theories with local constraints)? Emphasized the field theory / functional case Mar 7 comment How does the method of Lagrange multipliers fail (in classical field theories with local constraints)? PS sorry it took me so long to reply - you forgot to address your comment to me, so I wasn't notified of it. Mar 7 comment How does the method of Lagrange multipliers fail (in classical field theories with local constraints)? I was actually looking at a pointwise constraint $g(\phi(x))=0$ - so it's codimension is infinite (I guess). Why is the variational/functional derivative is not a good analog of the partial derivative in the finite dimensional case? Mar 6 awarded Organizer Mar 6 revised Derivative of $(a\,x)^{b\,x}$ Added brackets... Mar 6 comment Derivative of $(a\,x)^{b\,x}$ The link for the first example is wolframalpha.com/input/?i=D[(ax)^(bx),x]. Does anyone know how to get Wolfram|Alpha links working properly in the markup? Mar 6 revised Derivative of $(a\,x)^{b\,x}$ fixed image Mar 6 suggested approved edit on Derivative of $(a\,x)^{b\,x}$ Mar 6 answered Derivative of $(a\,x)^{b\,x}$ Feb 28 comment Div, curl and linear algebra There's something not quite right about this.... Feb 28 revised Div, curl and linear algebra added 18 characters in body Feb 28 revised Div, curl and linear algebra added 30 characters in body; added 12 characters in body Feb 28 answered Div, curl and linear algebra Feb 27 awarded Commentator Feb 27 awarded Autobiographer Feb 27 comment How does the method of Lagrange multipliers fail (in classical field theories with local constraints)? Thanks Christian. I never found this explanation completely satisfying - but I think that I'm coming around to liking it now. How does this understanding generalize to functionals - eg optimizing $\int f(x,\phi(x),\phi'(x)) dx$ wrt some constraint $g(\phi(x))=0$? Feb 27 comment Integration by parts @SMH: I don't know why, it works fine for me. This is the imgur link: i.imgur.com/2IrTU.gif Feb 27 awarded Student