Jorge
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 Jan 8 awarded Popular Question Jun 25 awarded Popular Question Jul 2 awarded Curious Dec 14 comment can an arbitrary set be.always embedded in other set? It clearly says no specified, not don't asume any model. Dec 14 revised can an arbitrary set be.always embedded in other set? added 63 characters in body Dec 14 asked can an arbitrary set be.always embedded in other set? Sep 28 comment Incomplete gamma function Thanks. Actually I was interested in an analytic formula, we're not going to do numerical work as fas as I know. I found that $$y^{8}\sum_{n=0}^{\infty}\frac{y^{n}}{(n+8)!}=e^{y}-\sum_{n=0}^{7}\frac{y^{n}}{‌​n!}$$ Sep 27 revised Incomplete gamma function added 75 characters in body Sep 27 asked Incomplete gamma function Sep 25 awarded Yearling Jul 17 answered “Fixed $k$” in Mathematical Induction Jul 11 revised How to simplify a sum with factorial? k^2 instead of 2^k typo Jul 11 suggested approved edit on How to simplify a sum with factorial? Jul 10 comment Infinite composition of functions Thank you, that made it more clear. I accepted Gottfried's answer instead of yours because of the reference recommendations, however I'm very grateful for your answer and comments. Jul 10 comment Infinite composition of functions Thank you for your fast comment. So your question is, if the range of $f_{n}=R_{n}$ then what is $\displaystyle \bigcap_{i \in \mathbb{N}}R_{i}$? I see more or less naively now that it should be the empty set, but I don't see how to formalize it. Jul 10 accepted Infinite composition of functions Jul 10 comment Infinite composition of functions I don't see how the range of $f^{n}(x)$ tends to the empty set as $n \to \infty$ Jul 10 asked Infinite composition of functions Jul 4 revised Determine variable vector compontent so vectors are independent edited LaTeX Jul 4 suggested approved edit on Determine variable vector compontent so vectors are independent