1,580 reputation
415
bio website
location
age
visits member for 2 years, 4 months
seen Jul 25 at 20:18

Dec
16
comment Prove that $f'$ exists for all $x$ in $R$
Possible duplicate: math.stackexchange.com/questions/64766/…
Dec
16
comment How to find $f'$ from the definition of derivative?
... so what is $f'(0)$?
Dec
16
revised How does one compute estimate of $ \theta$ for this density function?
added 23 characters in body
Dec
16
answered How does one compute estimate of $ \theta$ for this density function?
Dec
15
revised How random is the digits of $\pi$?
added 304 characters in body
Dec
15
comment How random is the digits of $\pi$?
If any of you guys have more requests, I'll be happy to compute/plot more data.
Dec
15
comment How random is the digits of $\pi$?
@PeterSheldrick: mathematica: Histogram[RealDigits[Pi, 10, 10000][[1]], 10]
Dec
15
answered How random is the digits of $\pi$?
Dec
15
comment Find the coordinate matrix of the function $\cos^2x$ relative to the ordered basis $\{1,\cos x,\sin x,\sin 2x\}$.
Since when are sets ordered?
Dec
12
comment In a fraction between integers, what denominators produce a periodic result?
Every ratio has periodic decimals, if that's what you're asking.
Dec
12
revised Defining the Complex numbers
added 296 characters in body
Dec
12
answered Defining the Complex numbers
Dec
11
answered Show that that $|\sqrt{x}-\sqrt{y}| \le \sqrt{|x-y|}$
Dec
11
comment Mind Maps for teaching Mathematics
mind maps are a waste of time in general.
Dec
11
comment Does $\{f_ng_n\}\to fg$ uniformly?
how can a sequence be unbounded and convergent under the natural topology?
Dec
10
comment Relatively compact subset of open set in $\mathbb{R}^n$
Ugh, this is why I secretly hate mathematics.
Dec
10
comment Relatively compact subset of open set in $\mathbb{R}^n$
@Cantor: if something is compact in $\mathbb{R}^n$, it is definitely compact in $U$. edit: ah yes, $\overline{A}$ math is simply not a subset of $U$ if it intersects the boundary.
Dec
10
comment Relatively compact subset of open set in $\mathbb{R}^n$
Isn't $A$ relatively compact because it is bounded? Just apply Heine-Borel, or am I missing something? If the coordinates of elements of $A$ are bounded by $M$, then $\overline{A}$ is bounded by $2M$.
Dec
8
comment Is $x^4+4$ an irreducible polynomial?
@Sigur: no general one, because that would probably give you an efficient algorithm for prime factorization.
Dec
8
comment Is $x^4+4$ an irreducible polynomial?
@Sigur: sometimes you can use Eisenstein's criterion, but it is generally a hard problem.