# ppyang

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## Registered User

 Name ppyang Member for 1 year Seen Mar 30 at 1:58 Website Location Age
 Feb27 revised Derivative of the regularized upper incomplete gamma functionedited body Feb25 comment Derivative of the regularized upper incomplete gamma function@Suvrit Sorry to have made confusion by using different variables in the definition of $Q$. Thank you for your attention, but I cannot understand your last sentense clearly. Can you explain how to use this formula to solve my question in more detail? Thank you very much! Feb23 revised Derivative of the regularized upper incomplete gamma functionUse the notation "regularized upper incomplete gamma function" Feb23 comment Derivative of the regularized upper incomplete gamma function@Suvrit Thank you for your attention! Do you mean there is a formula for $\frac{\partial Q(x,λ)}{\partial x}$ in wikipedia? I am sorry that I did not find such a formula but only the formula $\frac{\partial\Gamma(x,λ)}{\partial x}=\ln\lambda\Gamma(x,\lambda)+\lambda T(3,x,\lambda)$ instead. If you found the formula for the derivative of $Q(x,\lambda)$ w.r.t. $x$, could you please show me the url of the wikipedia? Thank you very much! Feb22 revised Derivative of the regularized upper incomplete gamma functionedited body Feb22 asked Derivative of the regularized upper incomplete gamma function Feb18 asked Are there a group of mappings from (n-1)-dim space to an (n-1)-sphere guaranteeing the orthogonality of images? Feb18 comment Is it possible to obtain the vectors orthogonal to a given one by orthogonal transformations?It's helpful of your answer. However there are some points in your answer that I cannot understand clearly since I do not major in mathematics. Could you please recommend some references or papers to explain your answer in more detail, please? Thank you very much! Feb18 comment Is it possible to obtain the vectors orthogonal to a given one by orthogonal transformations?I think both of your answers are very helpful. However, since I cannot accept both of your answers in the system and the answer given by Charles Rezk is in more detail, I choose to set his answer as the accepted answer. Anyway, it's very kind of you and thank you very much! Feb18 comment Is it possible to obtain the vectors orthogonal to a given one by orthogonal transformations?It's very kind of you for your help! Could you tell me the title of Adams's paper mentioned in your answer, please? I would like to understand how the result is obtained. Thank you! Feb17 asked Is it possible to obtain the vectors orthogonal to a given one by orthogonal transformations? Dec19 revised How to solve this optimization with the orthogonal constraint?edited title Dec13 comment How to solve this optimization with the orthogonal constraint?@Robert Bryant, I am sorry to trouble you all with this simple question and I have solved it. However, I have to say that this is indeed not my homework or exam problem. I will think more by myself before posting the question next time. Thank you very much! Dec13 answered How to solve this optimization with the orthogonal constraint? Dec12 asked How to solve this optimization with the orthogonal constraint? Nov29 comment What is the geometry of the intersection of some cones defined by generalized inequalities?I am reading the papers you suggested and they indeed provide an interesting standpoint for this question. Thank you very much!