Ziqian Xie
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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’.