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gustaffIR

 Mathematics

Associated with Math.SE; for both general discussion & math qu...
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gustaffIR
Jan 28, 2020 12:16
@sevdaicmis Hi, yeah I got it. Its differentiable. In fact max(0,f)^2 is differentiable (only points to worry about are when f=0 but taking one side of derivative and limits work out). Thanks.
gustaffIR
Jan 27, 2020 15:16
@sevdaicmis Its differentiable everywhere but derivative is discontinuous?
gustaffIR
Jan 27, 2020 14:56
Can someone please help with the following: Is [max(0,x^2 sin(1/x))]^2 differentiable at all points?
gustaffIR
Sep 4, 2019 09:14
@LeakyNun Thanks
gustaffIR
Sep 4, 2019 01:06
Can someone explain how to show e_i<f_i here math.stackexchange.com/a/2853462/428700
rationalpi
Jan 16, 2019 18:00
Let K be a subfield of C not contained in R then if Char(K)=0 then K is dense is easy to see as it will have Q as a subfield. Is this true when char(K)=!0?
rationalpi
Jan 7, 2019 02:35
Hi, can someone point out some good set of lecture notes on Modular Forms available online?
mathjack51
Jul 23, 2018 09:58
@mercio No I am not integrating f(0)
mathjack51
Jul 23, 2018 09:26
I had a confusion while exchanging summation and integral. If f is a number-theoretic function then $$\int_1^x \sum_{n\le y} f(n) dy = \sum_{n\le x} \int_n^x f(n) dy$$ how did the change of limit in integral take place? I am a bit confused. Please help.
Vulthuryol
Jun 9, 2018 19:57
Can someone elaborate how to apply inverse function theorem to conclude that A(V) is open?
Vulthuryol
Jun 9, 2018 19:56
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Q: Question about statement of Rank Theorem in Rudin

mez Theorem Suppose $m,n,r$ are nonnegative integers, $m\ge r, n\ge r$, $F$ is a $C^1$ mapping of an open set $E\subset \mathbb{R}^n$ into $\mathbb{R}^m$, and $F'(x)$ has rank $r$ for every $x\in E$. Fix $a\in E$, put $A = F'(a)$, let $Y_1$ be the range of $A$, and let $P$ be a projection in $\mat...

analysis differential-geometry manifolds intuition
Vulthuryol
Jun 5, 2018 16:45
@loch Thanks a lot
Vulthuryol
Jun 4, 2018 19:38
I am interested in learning representation theory, I was browsing the wiki on it. There are so many areas to read in. Can anyone suggest where should an undergraduate begin?
Vulthuryol
Jun 4, 2018 19:34
@Eulb try Janich(Topology) or Simmons(Topology and modern analysis)
Vulthuryol
Jun 1, 2018 03:53
Can anyone suggest some good exposition on Selberg's Trace Formula?
Glasgow39
Jun 23, 2017 21:08
Can someone give some link/resources recommendation to practice curve sketching? Thank You.
DarthVader1056
May 9, 2017 19:05
@Fargle Oh thanks a lot, the paper seems elementary enough to be read. Thanks again man.
DarthVader1056
May 9, 2017 19:03
@Fargle By no string you mean product? Can you give a link
DarthVader1056
May 9, 2017 18:58
@Fargle Yes any product with a prime such that p<=n+24<2p will not be so.
DarthVader1056
May 9, 2017 18:53
Does someone knows product of 25 positive consecutive integers which is a perfect square?
dovakin123
Apr 27, 2017 16:53
@Secret Thanks a lot.
dovakin123
Apr 27, 2017 16:49
Hi everyone please help. Is continued fraction expansion (Simple) of any irrational unique? Can someone direct me to a proof?
dovakin123
Apr 27, 2017 13:01
Can someone tell about some resources to learn "smoothing" an inequality?