M. Alaggan
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 Dec21 awarded Caucus Jul2 awarded Curious Oct1 accepted Can the measurement matrix used for compressive sensing be a sparse matrix? Sep30 accepted Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ Sep30 asked Can the measurement matrix used for compressive sensing be a sparse matrix? Sep12 accepted Handshaking with no crossovers in minimum number of rounds: has this problem been studied? Aug10 comment Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ But in this example, $e$, the base of the natural logarithm, is positive: $e^{z} \overset{!}{=} (e^{2\pi i})^{z/2\pi i} = 1^{z/2\pi i} = 1$ for all $z$. Is this an exception to the rule? Aug8 comment Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ So is it always safe to distribute the root over products and quotients if ["the number insider the root is positive" $\vee$ "the root is odd"]? Is that the rule? Aug7 comment Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ @ZevChonoles : The first question yes. But not the second question. Aug7 comment Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ Can you elaborate on why is this a problem? Aug7 comment Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ Aug7 asked Starting with $\frac{-1}{1}=\frac{1}{-1}$ and taking square root: proves $1=-1$ Jun30 accepted Proving that $\Pr[|X| > T\sqrt{n}/2] \geq \Pr[|X-\mathbb EX| < T\sqrt{n}/2]$ Jun30 comment Proving that $\Pr[|X| > T\sqrt{n}/2] \geq \Pr[|X-\mathbb EX| < T\sqrt{n}/2]$ Yes. But isn't by using the triangle inequality we have: $|X-\mathbb EX+\mathbb EX|\leqslant|X-\mathbb EX|+|\mathbb EX|$? Where did the minus sign in $-|X-\mathbb EX|$ come from? Jun30 comment Proving that $\Pr[|X| > T\sqrt{n}/2] \geq \Pr[|X-\mathbb EX| < T\sqrt{n}/2]$ Could you kindly elaborate the first inequality? I don't seem to be able to know how it was deduced. Jun30 asked Proving that $\Pr[|X| > T\sqrt{n}/2] \geq \Pr[|X-\mathbb EX| < T\sqrt{n}/2]$ Jun26 comment Does this probability distribution have a name? Hey, thanks for the answer. Would you kindly provide some explanation of how you reached this conclusion? Mar5 accepted The smallest normal set containing a subset $X$, what is a “normal set”? Feb22 awarded Announcer Jun8 awarded Constituent