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 May25 comment Application of weak $L^p$ estimate besides for proving boundedness of some linear operator Thank you for your reference. May24 comment Application of weak $L^p$ estimate besides for proving boundedness of some linear operator May I get the references for your argument (especially about Hardy-Littlewood Maximal operator)? In addition, can the density be applied for fractional integral operator? May23 asked Relation between fractional integral operator and solution of poisson equation May23 asked Application of weak $L^p$ estimate besides for proving boundedness of some linear operator May21 accepted existence of the solution of Neumann problem in $\mathbb{R}^3$ May11 asked existence of the solution of Neumann problem in $\mathbb{R}^3$ May11 accepted A function $f:\mathbb{R} \to \mathbb{R}$ with infinite norm but finite weak seminorm Apr18 answered Is there a difference between limit and “two-sided limit”? Apr18 accepted Two variable function with four different stationary points Apr17 comment Two variable function with four different stationary points effective diet pill, Thank you for your example. I hope that I can find simpler example. I think that we can ask, what happen the stationary point if $D=0$ just like $(0,0)$ is the saddle point of $f(x,y)=x^3-y^3$? Apr12 comment Determine the number of zeros in the first quadrant Just using the quadratic formula and $z=\frac{1}{2}-\sqrt{3}i$ is on the second quadrant Apr12 answered Determine the number of zeros in the first quadrant Apr12 comment Two variable function with four different stationary points Thanks @Ian Coley Apr12 comment Two variable function with four different stationary points Sorry, it is my typo Apr12 asked Two variable function with four different stationary points Mar18 comment A function $f:\mathbb{R} \to \mathbb{R}$ with infinite norm but finite weak seminorm @127.0.9.6. Well, after checking again, we have to restrict $q\geq 1$. Mar18 comment A function $f:\mathbb{R} \to \mathbb{R}$ with infinite norm but finite weak seminorm I really thank you for your help. Could you give the references related to this subject? If it is possible, how do I contact you? This problem related to my thesis. I have added the Dirac delta function that I mentioned as my example. May I modify your example and add it if you give your permission? If I do so, how do I give your credit as personal communication? Mar14 asked A function $f:\mathbb{R} \to \mathbb{R}$ with infinite norm but finite weak seminorm Feb9 revised Solution set of inequalities in $\mathbb{R}^6$ Edit the title Feb9 asked Solution set of inequalities in $\mathbb{R}^6$