Per Manne
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 Apr 10 comment Can we say that; $\frac{{\partial f}}{{\partial x}}$ and $\frac{{\partial f}}{{\partial y}}$ don't have a common factor? What if $f(x,y)=x^2y^2$? Apr 7 comment "Problems worthy of attack prove their worth by fighting back.” A more literal translation might be "Strike undauntedly at the problems, but be prepared for them striking back." Mar 5 awarded Enlightened Mar 5 awarded Nice Answer Mar 1 answered Behind which door is the princess? Jan 5 comment Please explain $4z + 2 = 2z + 1$ Exactly where is your problem? Any equality, such as $4z+2=2z+1$, says that two things or expressions are equal. When you do the same operation on both sides of the equality sign, the results will be equal to each other. By choosing the operations wisely, you end up with an equality saying that $z$ is equal to some number. Dec 19 revised How to compute this integral Edited tags Dec 19 revised How to compute the Laurent series Edited tags Dec 14 answered complex series expansion for $f(z)=\frac{1}{z-1}$ Nov 24 revised Matrix equation: solving $AB(A^{-1})(D^T)(C-1 )= E$ for $D$ Corrected tags. Nov 24 revised Calculating $\sum_{n=1}^\infty {\frac{nx^n}{4n^2-1}}$ rolled back to a previous revision Nov 20 comment Moscow State Oral Exam In order to get feedback, you should pose this as a new question, and not as an answer to another question. Nov 20 answered How to deal with misapplying mathematical rules? Nov 15 comment How to see symbol manipulation from an intuitive perspective in math? The link goes to a page where one can buy access to the text. It would be better if you gave the example directly, instead of this link. Nov 15 comment Why isn't the derivative of $|2x^2-3x|$ equal to $|4x-3|$? Look at a simpler example. Why isn't the derivative of $|x|$ equal to $|1|$? Nov 12 awarded Enlightened Nov 12 awarded Nice Answer Nov 6 answered Question about Weierstrass approximation theorem Sep 26 answered How do I differentiate $({\log n})^{\log n}$? Sep 20 comment A simple(ish) proof for the lagrangian with one inequality constraint? You should add these conditions to the statement of the theorem. For the proof, you can divide into two cases, according to whether $g(a,b)=m$, or \$g(a,b)