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seen Dec 15 at 9:30

Dec
4
revised What is general relationship between Lebesgue-Stieltjes measurability and Lebesgue measurability?
added 476 characters in body
Dec
4
asked What is general relationship between Lebesgue-Stieltjes measurability and Lebesgue measurability?
Nov
21
revised If $x$ is a Lebesgue point of $f$, $f \in L^p$ and $f(x)=0$, then it is a Lebesgue point of $f^p$ where $p>1$ (finite)?
added 88 characters in body
Nov
21
asked If $x$ is a Lebesgue point of $f$, $f \in L^p$ and $f(x)=0$, then it is a Lebesgue point of $f^p$ where $p>1$ (finite)?
Nov
11
awarded  Popular Question
Nov
7
revised How does perturbation method guarantee its solution for the perturbed pde $\Delta u + \epsilon u^2 =0$
added 164 characters in body
Nov
7
comment How does perturbation method guarantee its solution for the perturbed pde $\Delta u + \epsilon u^2 =0$
I really thank for you answer. If you don't mind one further question: In 2, you said I need several theorems (especially ones in Nonlinear PDE). So where can I get those? Could you name some papers or textbooks where I can learn these theorems from?
Nov
6
revised How does perturbation method guarantee its solution for the perturbed pde $\Delta u + \epsilon u^2 =0$
deleted 456 characters in body
Nov
6
revised How does perturbation method guarantee its solution for the perturbed pde $\Delta u + \epsilon u^2 =0$
added 77 characters in body
Nov
6
asked How does perturbation method guarantee its solution for the perturbed pde $\Delta u + \epsilon u^2 =0$
Oct
20
asked Where to learn perturbation theory for pde (in introductory level)? [Reference Request]
Sep
20
awarded  Yearling
Aug
4
comment If $f(x,y,z)$ takes a maximum $f(x_0,y_0,z_0)$ under $g(x,y,z)=1$ then $\nabla f$ is parallel to $\nabla g$ at the point under any condition?
Thank you. If you don't mind, could you name me references for KKT and Lagrange multiplier methods? Since all the textbooks I have does not have sections on these topics, not even Lagrange one. Thanks. I'd prefer if the textbooks are rigorous in manner.
Aug
4
asked If $f(x,y,z)$ takes a maximum $f(x_0,y_0,z_0)$ under $g(x,y,z)=1$ then $\nabla f$ is parallel to $\nabla g$ at the point under any condition?
Jul
2
awarded  Curious
Jul
2
awarded  Inquisitive
Jun
18
accepted In a normed space $X$ with field $\mathbb{R}$, is $\{ x \in X \mid \|x\| =1\}$ compact in general?
Jun
18
asked In a normed space $X$ with field $\mathbb{R}$, is $\{ x \in X \mid \|x\| =1\}$ compact in general?
Jun
17
asked A bounded sequence in $C[a,b]$ (normed by maximum norm) that has no convergent subsequence
Jun
17
asked Prove the derivative of $x^2 \sin (1/x^2)$ is not (Lebesgue) integrable on $[0,1]$