Barranka
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 Sep21 comment What is $dx$ in integration? Quite a good explanation Sep20 comment What are imaginary numbers? @CliveN. Man! This is one of the greatest, clearest, coolest and simplest answers I've ever seen for this question (and funniest, I had a lot of fun reading it). I will quote it every time I get the chance! +1 (If I could vote more than one time, I would) Aug21 awarded Citizen Patrol Aug21 awarded Critic Aug21 comment Which symbol should be used for an empty set? This is not a constructive question... It's just about "what symbol is better"... it's a matter of preference! Jun20 comment Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$? Notice that $\sqrt{x^2}=|x|$, so it can be said that $\sqrt{x^2}=\pm x$ Jun20 answered Sanity check, is $\{(-9,-3),(2,-1),(7,7),(-1,-1)\}$ a function? Jun17 revised Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$? Corrected: $x\geq0$ instead of $x>0$ Jun17 comment Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$? @Théophile ook... $x\geq0$ Jun17 answered Is it wrong to say $\sqrt{x} \times \sqrt{x} =\pm x,\forall x \in \mathbb{R}$? Jun7 comment What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? @MarkAdler Thank you Mark... I will soon correct my answer to include this calculation for the value of $\lambda$. And yes, Math is beautiful! :-) Jun6 awarded Supporter Jun5 revised What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? deleted 6 characters in body Jun5 revised What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? Corrected my answer by calculating 1-Pr{N=0} Jun5 comment What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? That said, I'm correcting my answer, because I calculated the probability of "being spotted" once per interval, which is not what we are looking for. The probability we're looking for is "what is the probability of 'being spotted' at least one time", which is 1 - Pr{"Not 'being spotted'"}. Jun5 comment What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? With no further information, the expected value of the tickets per hour is 0.8 (is a Bernoulli experiment). I think the Poisson Process hypothesis holds because all you know is that you may "get caught" with a given probability in a unit of time. Of course you can't be caught more than once a day, but that doesn't implies that you can't be "spotted" n times a day. Jun4 awarded Teacher Jun4 awarded Editor Jun4 revised What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour? Just added the coment about the memoryless property of the Poisson process, and the reference Jun4 answered What is the chance to get a parking ticket in half an hour if the chance to get a ticket is 80% in 1 hour?