# Rahul Narain

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bio website location age 28 member for 3 years, 4 months seen 3 hours ago profile views 3,940

Almost all of the questions on the front page these days are homework questions or textbook exercises. I think I'll be spending a lot less time here.

# 264 Reviews

 Dec10 reviewed Approve suggested edit on Probability of Bernoulli Trials. Dec10 reviewed Approve suggested edit on Prove that the $\lim_{x \rightarrow 0}\frac1x$ does not exist Dec10 reviewed Approve suggested edit on $a=-a$ ? How does it save properly? Dec10 reviewed Approve suggested edit on Ultraproducts by countably complete ultrafilter Dec10 reviewed No Action Needed How many outcomes of a coin being flipped 12 times have exactly 4 heads? Dec10 reviewed No Action Needed Why if the rank of matrix $M=\begin{pmatrix}2x&2y&0\\1&0&1\\ \end{pmatrix}$ is less than $2$,then $x=y=0$? Dec10 reviewed Close How to factor $x^3-x^2+x+3$ Dec10 reviewed Close Numerical solution of ordinary differential equation Dec10 reviewed Close Finding the first four nonzero terms of the maclaurin series of $f(x)=\frac{1}{-5+x^2}$ Dec9 reviewed Leave Closed Cardinality of some set of functions. Dec9 reviewed Leave Open Pattern of (1201, 2121, 3142, 4253, 5342) Dec9 reviewed Reject suggested edit on In plain English, why does conversion from hexadecimal to binary work so cleanly? Dec9 reviewed Approve suggested edit on I want to be able to write proof's for each of these but I don't know where to start. Dec9 reviewed Reject suggested edit on Linear algebra and combinatorics. For a family with even size sets and even intersections prove that $|F| \le 2^{n/2}$ Dec9 reviewed Reject suggested edit on Find $x$ such that $\sqrt{x+\sqrt{x+7}}\in \mathbb{N}$ Dec9 reviewed Reject suggested edit on A theorem about oscillation in Arnold's mathematical methods of classical mechanics Dec6 reviewed Looks Good Two parts I cannot understanding on simple proof about Hilbert Space Dec6 reviewed Close Show that each of the following is a tautology. Dec6 reviewed Reject suggested edit on Rationalizing the denominator with 3 roots Dec6 reviewed Approve suggested edit on Prove that either $(2^{10500} + 15)$ or $(2^{10500} + 16)$ is not a perfect square.