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???


Sep
7
comment Integral over set of measure zero.
I try not to use $\infty \times 0 = 0$
Sep
7
comment Put people into 2 rooms
Welcome to this site! What have you tried so far?
Sep
2
comment What's the correct type of brackets to use in a matrix?
@Vladhagen A waste of time as a comment.
Sep
2
answered What's the correct type of brackets to use in a matrix?
Sep
2
comment Finding the limit of $F(x)=\frac{x^2-4}{|x+2|}$
Note that the top is $(x+2)(x-2)$.
Sep
1
answered What does the Fraktur-R or Re stand for in math?
Sep
1
comment Contour Integral $ \int_{0}^1 \frac{\ln{x}}{\sqrt{1-x^2}} \mathrm dx$
Haven't done the details, but this is how I think it should work for contour. Consider the contour made up of 6 parts. The quarter-circle of radius $\epsilon$ about $0$, the quarter circle of radius $\epsilon$ about $1$, then the rest of the rectangle with large length $R$ connecting them. The parts on the quarter circles should vanish as $\epsilon \rightarrow 0$, and as $R \rightarrow \infty$. Then use Cauchy.
Aug
31
awarded  Custodian
Aug
31
reviewed Reject suggested edit on Laplace transform on a non-standard sort of problem
Aug
31
comment Laplace transform on a non-standard sort of problem
Yeah, but that's 10 more characters I have to type every time!
Aug
31
comment ellipse and focus question
Hello. What have you tried so far?
Aug
31
answered Laplace transform on a non-standard sort of problem
Aug
29
comment For any series that diverges, does there exist a sequence that converges to 0 yet the product diverges
@Nameless It has to work for each $a_n$
Aug
28
comment simple math question from civil service exam
What is a civil service and do they pay well?
Aug
28
comment simple math question from civil service exam
The answer should be $D$, and per foot has nothing to do with the answer.
Aug
26
comment How to show that a delta function solution to a PDE (Fokker-Planck) is really a solution
I'm a little confused here. $\alpha - \alpha(t)$... so one is a constant, one is a function of $t$, but both have the same symbol?
Aug
20
awarded  Yearling
Aug
12
accepted Getting a “straight” in dice rolls
Aug
12
answered A GRE Geometry Question
Aug
10
comment Holder Gradient Estimate for Linear Equation
Thank you. The rest of the thread is indeed interesting.