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Oct
12
comment Another math contest problem: $\int_0^{\frac{\ln^22}4}\,\frac{\arccos\frac{\exp\sqrt x}{\sqrt2}}{1-\exp\sqrt{4\,x}}dx$
Is that $\ln(2)^ 2/4$ in the upper bound?
Oct
12
reviewed Approve real analysis functions and interval
Oct
11
reviewed Looks OK How to prove this assertion in $S_n$ for $n \geq 3$?
Oct
11
reviewed No Action Needed How to find area of triangle from its medians
Oct
11
reviewed Approve Find a plane that passes through a point and is parallel to a given plane
Oct
11
reviewed Approve Why is the area under a curve the integral?
Oct
10
comment Is a rational-valued continuous function $f\colon[0,1]\to\mathbb{R}$ constant?
@copper.hat I meant the intermediate value theorem. I somehow always confuse the name of these
Oct
10
comment Is a rational-valued continuous function $f\colon[0,1]\to\mathbb{R}$ constant?
@DanielFischer True enough!
Oct
10
comment Is a rational-valued continuous function $f\colon[0,1]\to\mathbb{R}$ constant?
@DanielFischer with the mean value theorem, one could use density to prove it must pass through some irrational
Oct
10
reviewed Approve About $e^{\pi}\gt {\pi}^e, \ e^{e^{\pi}}\lt {\pi}^{{\pi}^{e}},e^{{\pi}^{{\pi}^e}}\gt {\pi}^{e^{e^{\pi}}}$ and their generalization
Oct
10
comment Finding the value of ${\mathop{\sum\sum\sum\sum}_{0\le i\lt j\lt k\lt l\le n }} \,n$
Since $0$ is included, that would be ${n+1}\choose 4$.
Oct
7
comment Can you help me with a limit?
I formatted your question. Make sure I've done it correctly
Oct
7
revised Can you help me with a limit?
Format, grammar and retagged
Oct
6
comment How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$?
@IanMateus I've changed it quite a bit, I think the problem in my last one was that I forgot to consider the walks that were made of say more NS than EW.
Oct
6
revised How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$?
added 220 characters in body
Oct
5
answered How can we directly see that the number of random walks starting and ending at the origin is ${n\choose n/2}^2$?
Oct
5
reviewed Approve General Exponential modular equation
Oct
5
reviewed Approve Sampling Distribution/Probability
Oct
5
reviewed No Action Needed Clarification regarding the monotone convergence theorem
Oct
5
reviewed No Action Needed Probability of voting in a group of four