458 reputation
512
bio website sigurdhsson.org
location Gothenburg, Sweden
age 24
visits member for 3 years, 11 months
seen Jul 15 at 18:10
Student at Chalmers University of Technology.

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
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
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
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 $(\Delta u)[\phi]=u[\Delta\phi]$?
Jan
5
comment Minimum for this function
For the "in" operator, use \in, not \epsilon. (Also what's up with the ugly sans-serif math font, did I miss something?)
Dec
29
comment Different notations for roots?
There are simpler, less error-prone and more intuitive ways to find roots than $p,q$-formulas. I suggest that you learn those instead.
Nov
11
comment How do I explain 2 to the power of zero equals 1 to a child
@J. M. and addition.
Oct
27
comment How safe is it to ignore low probability events?
Risk analysis may be appropriate here.
Oct
6
comment Evaluating $\int_{0}^{\infty }(2e^{-3x}+4e^{-7x})^2dx$
That's the approach I would use.
Oct
4
comment The Expectation and the Variance of the runs
Good point, although OP doesn't specify this.
Oct
4
comment The Expectation and the Variance of the runs
Whoever downvoted me is welcome to enlighten me as to why, so I may improve this and/or any future answers.
Sep
9
comment Trying to derive two dimensional version of Parseval's theorem (for real valued functions)
There is no such thing as the "Dirac function" — the Dirac delta is a distribution (i.e. generalized function, not probability distribution).