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Eric earned this badge 76 times |
mar 31 at 0:54
Given that $f(1)= 2013,$ find the value of $f(2013)$?
mar 15 at 16:30
What is $\int\frac{dx}{\sin x}$?
feb 3 at 19:19
When log is written without a base, is the equation normally referring to log base 10 or natural log?
jan 3 at 6:38
If $\sum\limits_{n=1}^{\infty}a_{n}$ diverges, does $\sum\limits_{n=1}^{\infty}\frac{a_{n}}{1+na_{n}}$ diverge?
jan 1 at 2:36
The number of prime years in a lifetime
dec 25 at 8:46
Prove the Wallis formula form $\left(4^{\zeta{(0)}} \cdot e^{-\zeta'{(0)}}\right)^2=\frac{\pi}{2}$
dec 25 at 4:16
Prove that for any nonnegative integer n the number $5^{5^{n+1}} + 5^{5 ^n} + 1$ is not prime
dec 21 at 11:09
Prove every odd integer is the difference of two squares
jul 17 at 16:39
Which is the easiest way to evaluate $\int \limits_{0}^{\pi/2} (\sqrt{\tan x} +\sqrt{\cot x})$?
may 31 '12 at 15:55
Always a prime between $x$ and $x+cf(x)$
may 1 '12 at 18:18
Importance of rigor
apr 25 '12 at 1:51
What is so interesting about the zeroes of the $\zeta$ function
apr 24 '12 at 13:55
Direct Proof that $1 + 3 + 5 + \cdots+ (2n - 1) = n\cdot n$
apr 17 '12 at 12:27
Trick for roots of symmetric polynomials
mar 20 '12 at 23:21
Solve the integral $S_k = (-1)^k \int_0^1 (\log(\sin \pi x))^k dx$
mar 19 '12 at 14:56
If a matrix is invertible, is its multiplication commutative?
mar 14 '12 at 2:44
Prove $\sum\limits_{n\leq x} \frac{n}{\phi(n)} =O(x) $
jan 26 '12 at 18:14
What is special about the numbers 9801, 998001, 99980001 ..?
jan 26 '12 at 16:24
$\frac {n}{5} < \phi (n) < n$ for all $n > 1$?
jan 26 '12 at 15:29
100 Soldiers riddle
jan 24 '12 at 16:43
lim (a + b) when lim(b) does not exist?
jan 23 '12 at 13:46
How many solutions are there to $F(n,m)=n^2+nm+m^2 = Q$?
jan 23 '12 at 3:25
Chebyshev: Proof $\prod \limits_{p \leq 2k}{\;} p > 2^k$
jan 16 '12 at 19:59
if $m^2 = a^3 - b^3$, then $m$ is the sum of two squares.
jan 4 '12 at 19:26
Mean Value of a Multiplicative Function close to $n$ in Terms of the Zeta Function.
dec 15 '11 at 19:57
Prove $2^{1/3}$ is irrational.
dec 13 '11 at 21:01
Proof: If $n=ab$ then $2^a-1 \mid 2^n-1$
nov 24 '11 at 19:34
Why is this series of square root of twos equal $\pi$?
nov 17 '11 at 21:13
Evaluate $\sum\limits_{n=0}^\infty \frac{1}{4n^2+1}$ by using complex contour integration
nov 16 '11 at 9:07
Why does volume go to zero?
nov 1 '11 at 16:29
How to sum this series for $\pi/2$ directly?
oct 31 '11 at 16:21
Integral involving $\coth (x)$: Maple and Mathematica disagree
oct 25 '11 at 16:29
How to prove that $\sum\limits_{n=1}^\infty\frac{(n-1)!}{n\prod\limits_{i=1}^n(a+i)}=\sum\limits_{k=1}^\infty \frac{1}{(a+k)^2}$ for $a>-1$?
oct 22 '11 at 0:30
A pencil approach to find $\sum \limits_{i=1}^{69} \sqrt{\left( 1+\frac{1}{i^2}+\frac{1}{(i+1)^2}\right)}$
oct 19 '11 at 15:29
Logarithmic derivative of Riemann Zeta function
oct 15 '11 at 13:00
How does $ \sum_{p<x} p^{-s} $ grow asymptotically for $ \text{Re}(s) < 1 $?
oct 10 '11 at 16:12
What's the lower bound of the sum $S(n) = \sum_{k=1}^n \prod_{j=1}^k(1-\frac j n)$?
oct 5 '11 at 10:59
Sequence of numbers with prime factorization $pq^2$
oct 4 '11 at 18:52
How can I evaluate $\sum_{n=0}^\infty (n+1)x^n$
sep 21 '11 at 19:18
Is it possible $n(n+1)(n+2)…(n+k)$ is a square?
sep 16 '11 at 1:19
If G is not commutative, then is there always a subgroup that is not a normal subgroup?
sep 14 '11 at 17:56
Probability that two random numbers are coprime
sep 14 '11 at 0:41
Which of these courses to take if one intends to go to grad school in pure math (rank please)
aug 26 '11 at 2:35
Proof of 1=0 by mathematical induction?
aug 25 '11 at 4:29
Show that $A_n=\sum\limits_{k=1}^n \sin k $ is bounded?
jul 27 '11 at 19:28
What is the difference between max and sup?
jul 26 '11 at 1:37
What is the last digit of $\pi$?
jul 24 '11 at 7:49
Limits: How to evaluate $\lim\limits_{x\rightarrow \infty}\sqrt[n]{x^{n}+a_{n-1}x^{n-1}+\cdots+a_{0}}-x$
jul 22 '11 at 17:40
Sum of coefficients of an orthogonal matrix
jul 19 '11 at 14:52
Asymptotic estimate for Riemann-Lebesgue Lemma
jul 19 '11 at 6:37
Solving inequalities with “x” in the denominator
