miracle173
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 1d comment Find all functions $f(f(f(…(f(x_1,x_2),x_3),…),x_{2016}))=x_1+x_2+…+x_{2016}$ I cant see that it is ovious (from the outer most iteration) that f(x,y)=g(x)+y. How can you proof this? 1d revised How to calculate P(A∩B), P(A∩C), P(B∩C) and P(A∪C), P(B∪C)? typo 1d answered Find all functions $f(f(f(…(f(x_1,x_2),x_3),…),x_{2016}))=x_1+x_2+…+x_{2016}$ 1d comment Find all functions $f(f(f(…(f(x_1,x_2),x_3),…),x_{2016}))=x_1+x_2+…+x_{2016}$ Your picture of the text contains 17 lines, 14 are unrelated to the problem. You should change this. Also you didn't add a reference for your problem, e.g., which contest. You "work so far" shows not much effort. It maybe important that n=2007 and not n=2016. But you can start with n=3. This makes the structure of the problem simpler. Maybe this brings some insight after some work. 1d revised Find all functions $f(f(f(…(f(x_1,x_2),x_3),…),x_{2016}))=x_1+x_2+…+x_{2016}$ a typo and some latex 2d comment Supposed p is a prime Number such that (p-1)/4 and (p+1)/2 are also primes. Show that p=13 Please make your post more readable and ude $LaTeX$ 2d revised Bronstein Integral 21.42 typo in title 2d revised Need a book on Algebra but having these properties for self study and beginner format 2d comment The probability distribution @AndyK I don't think that this is a $LaTeX$ specific term. It is about programs in general and describes a chunk of code that "will allow readers to copy-and-paste-and-compile your code and see exactly what problems you might be experiencing". I can't see how this is useful in this context. 2d comment The probability distribution Please show us your efforts. 2d revised The probability distribution inlining image 2d revised What degree should my hermite polynomial be deleted 2 characters in body 2d revised What degree should my hermite polynomial be deleted 2 characters in body 2d revised What degree should my hermite polynomial be format latex 2d comment I want to show that $x^2 - x + C\epsilon\ge 0$ under some assumption. if $x=5$ what is your sufficiently small $\varepsilon$? 2d comment I want to show that $x^2 - x + C\epsilon\ge 0$ under some assumption. That sentence make no sense. If yo want to assume that $x \le 1/2 \sqrt\epsilon$ then assume it. But again, your formulation does not make no sense. 2d comment I want to show that $x^2 - x + C\epsilon\ge 0$ under some assumption. "Let $x\ge 0$. For sufficiently small $\epsilon>0$, assume that $x\le \sqrt\epsilon$." That does not make sense. Given $x$ you have to make $\epsilon$ sufficiently large, to make $\sqrt\epsilon$ greater than $x$, not to make it sufficiently small. Or maybe you want to say only "Assume that $x\le \sqrt\epsilon$" May 2 reviewed Approve Problem on this Geometry question Apr 30 reviewed Approve Problem involving subspaces and linear transformations Apr 29 comment Why is The Following equality true? (limit of a sum and integrals) en.wikipedia.org/wiki/Riemann_sum#/media/…