# André Nicolas

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220 today
 +45 20 mins ago 4 events What are the limits for this joint pdf? +45 1 hour ago 4 events Using trial division in $\mathbb{Z}/2\mathbb{Z}[x]$, factor $x^6+x^4+x$ into a product of irreducible polynomials. +35 3 hours ago 3 events integral roots for $f(x) = 41$ if $f(x) = 37$ has 5 distinct integral roots. +20 28 mins ago 2 events How to find answer to the sum of series $\sum_{n=1}^{\infty}\frac{n}{2^n}$ +15 6 mins ago accept Easy mean-variance problem +15 1 hour ago accept How many equivalence relations on a set with 4 elements. +15 1 hour ago accept Normal Distribution finding values +10 16 mins ago upvote Need help solving exponential equation $2\mathrm{e}^x=5-\mathrm{e}^{-x}$ +10 19 mins ago upvote What is the probability that the most successful out of these twenty will be right at least 9 times out of the next 10 predictions they make? +10 19 mins ago upvote Find the conditional expectation of N given that there were exactly 2 heads in the first 3 tosses. 1 hour ago reversal Serial upvoting reversed
290 yesterday
 +45 13:00 4 events If $n > 2$, prove that the order of the multiplicative group of units modulo n, $U_n$, is even. +40 21:39 4 events How does this series diverge? +35 11:18 3 events For any positive integers $a$ and $b$, the number $(36a+b)(a+36b)$ can never be a power of $2$. +25 22:43 3 events Explanation of recursive function +20 21:57 2 events an intriguing integral $I=\int\limits_{0}^{4} \frac{dx}{4+2^x}$ +15 23:32 6 events Need help solving exponential equation $2\mathrm{e}^x=5-\mathrm{e}^{-x}$ +15 22:10 accept Find the conditional expectation of N given that there were exactly 2 heads in the first 3 tosses. +15 20:04 accept finding the cdf of the max of a joint distribuion +10 21:56 upvote Find the probability that the difference between the sample mean and the true population mean wll not exceed 0.5 inch +10 21:39 upvote Routes to a house +10 19:19 upvote Show that any infinite set $X$ may be endowed by a metric d such that $X$ has a limit point in $(X,d)$ +10 15:33 upvote Probability Question - team draw from field of 32 +10 13:14 upvote Prove that $\sum_{k=0}^n k^2{n \choose k} = {(n+n^2)2^{n-2}}$ +10 11:54 2 events System $a+b+c=4$, $a^2+b^2+c^2=8$. find all possible values for $c$. +10 04:39 upvote Proving limits of complex numbers +10 02:20 upvote Is the following matrix invertible? 12:09 upvote What is the correct value of $\pi$ 12:08 upvote Roots of $x^2 + 2x + 2$ 12:07 upvote Evaluating $\int \frac{1}{x^{7} - x} ~ d{x}$. 12:07 upvote How can I show that $\sqrt{1+\sqrt{2+\sqrt{3+\sqrt\ldots}}}$ exists? 12:06 upvote Fun Integral $\int \frac{dx}{\cos^3 x+2\sin(2x)-5\cos x}$ 12:06 upvote Prove $1 + 2 + 4 + 8 + \dots = -1$ 12:05 upvote 3xy + 14x + 17y + 71 = 0 need some advice 12:05 upvote Are known transcendental numbers countable? 12:04 upvote How to integrate $\int_0^{\pi/2}\frac{\sin^nx}{\sin^nx+\cos^nx}dx$? 12:04 upvote Simplify $\frac{1}{1 + \sqrt{2}} + \frac{1}{\sqrt{2} + \sqrt{3}} + \frac{1}{\sqrt{3} + \sqrt{4}} + \cdots+ \frac{1}{\sqrt{24} + \sqrt{25}}$ 12:03 upvote How can I find $\int\frac1{\sqrt[4]{1+x^4}}\mathrm dx$? 12:02 upvote Accidents of small $n$ 12:02 upvote If 1 boy knows r girls and 1 girl knows r boys ,then number of boys=girls 12:00 upvote Is $83^{27} +1$ a prime number? 12:00 upvote A difficult integral : $\dfrac { \int_0^{\pi/2} (\sin x)^{\sqrt 2 + 1} dx} { \int_0^{\pi/2} (\sin x)^{\sqrt 2 - 1} dx}$ 12:00 upvote What do Algebra and Calculus mean? 12:00 upvote Simplifying $\sqrt{5+2\sqrt{5+2\sqrt{5+2\sqrt {5 +\cdots}}}}$ 11:59 upvote How to integrate $\int\frac{1}{1+\cos{x}}\ dx$? 11:58 upvote If $5x+12y=60$ , what is the minimum of $\sqrt{x^2+y^2}$? 11:57 upvote Prove if $56x = 65y$ then $x + y$ is divisible by $11$ 11:57 upvote A simple way to evaluate $\int_{-a}^a \frac{x^2}{x^4+1} \, \mathrm dx$? 11:57 upvote Are there infinitely many rational outputs for sin(x) and cos(x)? 11:56 upvote are all $n!$ ($n>3$) the difference of two squares? 11:56 upvote Proving that $\frac{1}{\sqrt{1}} + \frac{1}{\sqrt{2}} + \cdots + \frac{1}{\sqrt{100}} < 20$ 11:56 upvote Find the limit $\lim \limits_{n\to \infty }\cos \left(\pi\sqrt{n^{2}-n} \right)$ 11:56 upvote Find the sum of all real solutions for $x$ to the equation $(x^2 + 2x + 3)^{(x^2+2x+3)^{(x^2+2x+3)}} = 2012.$ 11:55 upvote How I can prove that the sequence $\sqrt{2} , \sqrt{2\sqrt{2}}, \sqrt{2\sqrt{2\sqrt{2}}}$ converges to 2? 11:54 upvote “Negative” versus “Minus” 11:54 upvote Why can ALL quadratic equations be solved by the quadratic formula? 00:38 upvote The pointwise limit of increasing functions on $[0,1]$ is increasing.
275 2 days ago
 +40 18:15 4 events Integer solutions Help +35 20:17 3 events Why is the probability of drawing a king and then a heart the same as drawing the king of hearts? +25 01:05 2 events Question on Conditional Probability and dependence +20 17:50 2 events Prove $M$ is a Maximal Ideal in $\Bbb Z\times \Bbb Z$ +20 06:48 2 events Sylvester Gallai Problem +15 20:53 2 events Proving limits of complex numbers +15 04:12 accept Prove that 3 is a primitive root of $7^k$ for all $k \ge 1$ +15 03:20 accept Calculating bounds with multiple random variables. +10 14:44 upvote Proof about boundedness of $\rm Si$ +10 11:53 upvote Is it possible to approximate this series? +10 11:29 upvote Coprimality of $2^n + 3^n$ and $5^n + 7^n$ +10 09:32 upvote population of a city based on another [hw] +10 08:53 upvote Find a closed form from the given power series +10 08:19 upvote Is the following matrix invertible? +10 07:35 upvote Finding correlation coefficient +10 03:17 upvote If $\alpha$ is an irrational real number, why is $\alpha\mathbb{Z}+\mathbb{Z}$ dense in $\mathbb{R}$? +10 00:21 upvote Fun Integral $\int \frac{dx}{\cos^3 x+2\sin(2x)-5\cos x}$ 21:26 upvote Proving discontinuity by epsilon-delta 11:53 upvote “Negative” versus “Minus”
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