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 Jun 3 awarded Supporter Jun 3 comment Newbie: determine if line *segment* intersects circle Good ! Mark this answer as solution. You can also add your final code, if you want to help someone with the same issue. And try to learn basic vectorial math ;) Jun 1 revised Every continuous function $f: \mathbb{R} \to \mathbb{R}$ is uniformly continuous on every bounded set. added 9 characters in body Jun 1 answered Every continuous function $f: \mathbb{R} \to \mathbb{R}$ is uniformly continuous on every bounded set. May 31 awarded Teacher May 31 answered Convergence in distribution and taking sqrt of random variables May 31 comment What if the cauchy product of two series in $\mathbf{Z}$ is null It is not possible to do that, the sum $c_n=\sum_{i \in\mathbf Z}{a_i b_{n-1}}$ are on an infinite number of items. May 31 comment Newbie: determine if line *segment* intersects circle My mistake, there were a typo in the formula for alpha. By the way, you should use a pastebin or gist.github.com and keep you question clean. May 31 revised Newbie: determine if line *segment* intersects circle wrong formula for alpha May 31 comment What if the cauchy product of two series in $\mathbf{Z}$ is null The last term is of course c_1 = 0 + \sum_{i \neq -1,1}{\frac{1}{(2i+1)(2i-1)}\frac{1}{-\pi}}\neq 0. Too late to edit. May 31 comment What if the cauchy product of two series in $\mathbf{Z}$ is null I am not sure to understand. $c_0 = \sum_j{a_j b_{-j}} = 1/4 + \sum_{j \neq 0}{\frac{1}{-(2j+1)^2}\frac{1}{-\pi}} = 0$, but $c_1 = 0 + \sum_{i \neq -1,1}{\frac{1}{(i+1)(i-1)}\frac{1}{-\pi}}\neq 0$. May 31 comment Newbie: determine if line *segment* intersects circle Yes $|MC|$ is the distance between M and C. It is also commonly writen just $MC$. R is the radius of the circle. R$is a mispelling ;) May 31 revised Newbie: determine if line *segment* intersects circle added 206 characters in body May 31 answered Newbie: determine if line *segment* intersects circle May 31 revised What if the cauchy product of two series in$\mathbf{Z}$is null deleted 5 characters in body May 31 comment What if the cauchy product of two series in$\mathbf{Z}$is null It is a good idea, but$\sum{\left|a_i b_{n-i}\right|}$does not converge. May 31 awarded Editor May 31 revised What if the cauchy product of two series in$\mathbf{Z}$is null added 29 characters in body May 31 comment What if the cauchy product of two series in$\mathbf{Z}$is null I supposed implicitely that$\forall n, \sum_{i\in\mathbf{Z}}{\left|a_ib_{n-i}\right|}\$ is defined. I add it to the question. May 31 awarded Student