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Jul
26
reviewed Approve suggested edit on the use of Cartesian product
Jul
14
reviewed Approve suggested edit on How do I solve $y' = \sin(x - y)$?
Jul
14
reviewed Reject suggested edit on Find the equation of a line which is perpendicular to a given vector and passing through a known point
Jul
2
reviewed Approve suggested edit on What techniques are there to search for first order sentence equivalence?
Jun
30
reviewed Approve suggested edit on fair-division tag wiki
Jun
27
comment How does this proof of the Cauchy-Schwarz Inequality work?
The same question: math.stackexchange.com/questions/182808/…
Jun
23
reviewed Reject suggested edit on Sphere homeomorphic to plane?
Jun
22
comment My son's Sum of Some is beautiful! But what is the proof or explanation?
Now it is more than 128. The next number is 1024.
Jun
22
comment Computing the spherical mean and showing it satisfies PDE
@epimorphic: I think I misunderstood the question. Please see the update.
Jun
22
revised Computing the spherical mean and showing it satisfies PDE
added 1143 characters in body
Jun
22
comment Computing the spherical mean and showing it satisfies PDE
@epimorphic: It is understood that the spherical mean $u$ is a function of $r=r(x,y,z)$, i.e., given $r>0$, you first compute the average of $h$ over the sphere of radius $r$, and then assign this value to $u$, whose value is constant on the said sphere.
Jun
22
reviewed Approve suggested edit on Topology: Interior
Jun
22
comment Why can't we define more elementary functions?
@user7530: If you add $\frac12$ to the integers then all integer multiples of $\frac12$ must also be added. The result is the same as we have done nothing.
Jun
22
comment Showing that a sequence of Picard iterates converges
I don't understand the issue here. Wouldn't it be even better if you have proved convergence in a larger interval?
Jun
22
answered Computing the spherical mean and showing it satisfies PDE
Jun
21
reviewed Approve suggested edit on Prove that $D _n= \{x, d(x,B) \ge 1/N\text{ and }d(x,0) \le N \} $ is a closed set in $\mathbb R^n $
Jun
16
reviewed Approve suggested edit on $\int_{0}^{+\infty}\dfrac{e^{-ax^p} - e^{-bx^p}}{x}dx$
Jun
16
comment How do i show that $\{m/2^n:m,n\in\mathbb{R}\}$ is dense in $\mathbb{R}$?
The question is basically asking if you know what "dense" means, and what $\mathbb{R}$ is. In other words, if you understand the question, then you can answer it.
Jun
16
reviewed Approve suggested edit on Why are higher-degree polynomial equations more difficult to solve?
Jun
15
reviewed Approve suggested edit on indeterminate-forms tag wiki