Reputation
21,195
Top tag
Next privilege 25,000 Rep.
Access to site analytics
Badges
1 17 46
Newest
 Enlightened
Impact
~248k people reached

Apr
17
comment How many elements are in the set $ \{ \left( \frac{2+i}{2-i} \right) ^n : n \in \mathbb N\}$
@mathguy If you stress text with double asterisks (**text**), it won't look like SCREAMING
Mar
28
revised Does the integral of $\int_0^2 (\ln x)^{-2}$ exist?
edited title
Mar
20
revised Minimum and maximum on the closed disk $\,D(0,1)-f(z)=z^2-z$
added 5 characters in body
Mar
20
answered Binomial Normal Stats
Mar
20
comment Binomial Normal Stats
Your "probabiliteis" aren't even in $[0,1]$. That cannot possibly correct.
Mar
16
comment When derivative of a function is its inverse function and vice-versa
Please use a more clear notation. Is $fi$ the inverse function ($f^{-1}$), as it says in the title, or the derivative of the inverse ($\frac{\mathrm d}{\mathrm dx}f^{-1}$), as it says in the body?
Mar
14
comment What is a mathematical expression for the sequence $\{1,1,-1,-1,1,1,-1,-1,\dots\}$?
+1 for showing a general approach to this class of problems
Mar
11
awarded  Enlightened
Mar
11
awarded  Nice Answer
Feb
20
awarded  Good Answer
Feb
19
awarded  Enlightened
Feb
19
awarded  Nice Answer
Feb
19
answered How to write a function from graph?
Feb
19
comment Show that the area of the face of the coin is $\frac{a^2}{2}(\pi-7\tan\frac{\pi}{14})$
What have you tried so far? A small hint: Start with the $7$ sectors and work out the area you counted multiple times.
Feb
19
revised Show that the area of the face of the coin is $\frac{a^2}{2}(\pi-7\tan\frac{\pi}{14})$
added 1 character in body; edited title
Feb
19
comment Why is derivative of $x$ with respect to $x$ equal to $1$?
@Masacroso It doesn't seem like a good idea to start learning about derivatives with nonstandard analysis if standard analysis was not even learned ;-)
Feb
19
comment Why is derivative of $x$ with respect to $x$ equal to $1$?
@KimPeek The first class of derivatives I learned about was in fact that of (affine) linear functions of the form $f(x) = cx+b$. Indeed more people in my class had trouble seeing that the derivative of a constant was $0$ than seeing that the derivative of $cx$ was $c$.
Feb
19
answered Why is derivative of $x$ with respect to $x$ equal to $1$?
Feb
7
revised Why *all* $\epsilon > 0$, in the $\varepsilon-\delta$ limit definition?
edited body
Feb
5
revised How did the rule of addition come to be and why does it give the correct answer when compared empirically?
Grammar fix