460 reputation
512
bio website sigurdhsson.org
location Gothenburg, Sweden
age 24
visits member for 4 years, 2 months
seen Oct 19 at 16:54
Student at Chalmers University of Technology.

Oct
18
revised If $(a + ib)^3 = 8$, prove that $a^2 + b^2 = 4$
Format the tag properly
Oct
18
suggested suggested edit on If $(a + ib)^3 = 8$, prove that $a^2 + b^2 = 4$
May
19
awarded  Citizen Patrol
May
4
awarded  Good Answer
Feb
5
awarded  Yearling
Dec
12
suggested suggested edit on If p is an odd prime, prove $1^p + 2^p + 3^p +\cdots+(p-1)^p$ is congruent to $0\pmod p$
Dec
9
comment 7 Drinks - 7 Flavors - Infinite variety?
Well, no. For the same reason that the Banach-Tarski paradox doesn't apply to reality (you can't have an infinitesimal part of a ball/amount of a liquid).
Sep
19
comment Solving Normal Distribution Probability
Bayes' theorem?
Aug
25
comment I need a function with the following behavior
i.e. $\frac{a}{\ln(b+1)}\ln(x+1)$
Aug
19
comment Create a C++ program to evaluate the following series: $\sin x \approx x - \frac{x^3}{3! }+\frac{x^5}{5!}-\frac{x^7}{7!}\cdots\pm\frac{x^n}{n!}$
Since we're talking C++, some template metaprogramming could speed up the calculation as well.
Aug
8
accepted The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
Aug
6
comment The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
I guess I was using it as a definition without realizing. I have removed that sentence from the question to avoid more confusion.
Aug
6
revised The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
deleted 97 characters in body
Aug
6
comment The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
There's no explicit definition in the exercise, but just expanding $\Delta$ and applying the known relation $\partial u[\phi] = -u[\partial \phi]$ means it has to be that way.
Aug
6
awarded  Commentator
Aug
6
comment The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
@joriki: I added the missing $\sin\theta$ factor. Are you saying that I should apply Green's identity to the two integrals instead of using it to show $(\Delta u)[\phi]=u[\Delta\phi]$?
Aug
6
revised The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
added 10 characters in body
Aug
6
asked The distribution $\Delta u$ (where $u = \ln|\vec{x}|$)
Jun
8
awarded  Constituent
Jun
8
awarded  Caucus