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Apr
23
accepted Why is chi-square distribution with 2 degrees of freedom an exponential distribution?
Apr
22
awarded  Notable Question
Apr
19
revised Why is chi-square distribution with 2 degrees of freedom an exponential distribution?
added 3 characters in body; edited tags
Apr
19
asked Why is chi-square distribution with 2 degrees of freedom an exponential distribution?
Mar
27
comment Generating Numbers Proof
Your idea is correct, you can do induction on number of digits. Base cases are 1 through 9.
Mar
27
comment Rational or Irrational number
Any irrational number of form $\sqrt n - \frac{1}{2}$, where $n$ is an integer.
Feb
15
awarded  Organizer
Feb
15
revised State space for 8-queen problem
add the combinatorics tag
Feb
15
suggested approved edit on State space for 8-queen problem
Feb
15
comment How many cube roots does an $n\times n$ identity matrix have over $\mathbb C$?
So if $A$ is a solution, then $PAQ$ is a solution, as long as $PQ = QP = I$. Here $P=\begin{bmatrix} 1 & 0 \\ 0 & 1/t \end{bmatrix}$ and $Q=\begin{bmatrix} 1 & 0 \\ 0 & t \end{bmatrix}$.
Feb
15
comment How many cube roots does an $n\times n$ identity matrix have over $\mathbb C$?
Thanks! glad to know that MATLAB is wrong..
Feb
15
accepted How many cube roots does an $n\times n$ identity matrix have over $\mathbb C$?
Feb
15
revised How many cube roots does an $n\times n$ identity matrix have over $\mathbb C$?
edited title
Feb
15
asked How many cube roots does an $n\times n$ identity matrix have over $\mathbb C$?
Feb
13
comment Subspace topology and order topology
I was also puzzled by this before, note that $I\times I$ is not convex in the order topology.
Feb
12
accepted Why is the map $f(x)=e^{i2\pi x}$ from $[0, 1)$ to the unit circle continuous?
Feb
12
revised Why is the map $f(x)=e^{i2\pi x}$ from $[0, 1)$ to the unit circle continuous?
grammer
Feb
12
asked Why is the map $f(x)=e^{i2\pi x}$ from $[0, 1)$ to the unit circle continuous?
Apr
17
suggested rejected edit on Derive an exact formula (solve the recurrence definition) for the following recursive sequence:
Apr
16
comment Question about parallel displacement on a surface
Sorry, but I think you misunderstood, I am asking whether the calculation in my question (which is quoted from a problem in the book I mentioned) is right or not, and presumably it is not right because the author explicitly said ‘what's wrong with the following argument’.