JimmyK4542's user avatar
JimmyK4542's user avatar
JimmyK4542's user avatar
JimmyK4542
  • Member for 9 years, 9 months
  • Last seen this week
  • East Lansing, MI
114 votes

Problems that become easier in a more general form

65 votes
Accepted

When does L' Hopital's rule fail?

57 votes

Showing that Y has a uniform distribution if Y=F(X) where F is the cdf of continuous X

44 votes
Accepted

What does the antiderivative of a continuous-but-nowhere-differentiable function "look like"?

34 votes

Produce unique number given two integers

34 votes
Accepted

$xf(y)+yf(x)\leq 1$ for all $x,y\in[0,1]$ implies $\int_0^1 f(x) \,dx\leq\frac{\pi}{4}$

31 votes
Accepted

Are these square matrices always diagonalisable?

31 votes
Accepted

Does this algorithm find prime numbers only?

28 votes
Accepted

A riddle with a witch and some gnomes (guessing numbers on hats)

28 votes
Accepted

If $x$ is a rational number, then $1/x$ is a rational number

27 votes
Accepted

Sum of consecutive numbers

22 votes

Finding $\binom{n}{0} + \binom{n}{3} + \binom{n}{6} + \ldots $

21 votes

Is some thing wrong with the epsilon-delta definition of limit??

21 votes

Has anyone developed a 'theoretical minimum' for mathematics?

20 votes

Can any real number be expressed as an integral combination of $e$ and $\pi$?

19 votes
Accepted

Fermat's Last Theorem for Negative $n$

19 votes
Accepted

Matrix exponential of a skew-symmetric matrix without series expansion

19 votes

$\sum \tan ( 1/n)$ diverges

19 votes
Accepted

$\operatorname{rank}(AB-BA)=1$ implies $AB-BA$ is nilpotent

18 votes
Accepted

Does the series $\sum\limits_n(2^{1/n} - 1)$ converge?

18 votes
Accepted

How is that a rotation by an angle θ about the origin can be represented by this transformation matrix?

18 votes

How to prove that $\frac{(12!)!}{12!^{11!}}$ is integer?

17 votes

How to find the exponential of a nilpotent matrix?

16 votes
Accepted

proving $t^6-t^5+t^4-t^3+t^2-t+0.4>0$ for all real $t$

15 votes

Adding digits to make a number prime or composite

15 votes

Sigma notation for sum of $\ln(x)^2$ from $2$ to $20$ with non-integer steps

15 votes

Does the recursive sequence $a_1 = 1, a_n = a_{n-1}+\frac{1}{a_{n-1}}$ converge?

15 votes

What's the intuition behind the 2D rotation matrix?

14 votes
Accepted

Tossing a coin with at least $k$ consecutive heads

14 votes
Accepted

$2^x + 3^x - 4^x + 6^x - 9^x ≤ 1$ $\forall x \in R$

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