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 Jan 21 awarded Yearling Jan 12 answered Is $a_n=\frac{1}{n}\sum_{k=1}^n\frac{\varphi(k)}{k}$ convergent? Jan 12 revised Paper of Paul Erdös Made question mostly self contained Jan 12 comment Paper of Paul Erdös I've attempted to make your question self contained by including quotes from relevant portions of Erdös' paper, as well as including the title of the paper. (This staves off link rot.) Might I suggest turning the congruence part of the post into a separate question, given that it's somewhat different than the components related to bounds on prime numbers? Jan 12 revised Paper of Paul Erdös Made question mostly self contained Nov 26 comment What is the popular approaches for optimizing boolean function Generally speaking, discrete optimization is a hard topic and has entirely different approaches from continuous optimization. Nov 12 comment Length of diagonal compared to the limit of lengths of stair-shaped curves converging to it In-spirit duplicate of math.stackexchange.com/q/12906/23353 Nov 9 answered Proof by induction $\sum_{k=1}^{2^n} \frac1k \ge 1 + \frac{n}2$ Sep 16 comment 2D rotation of point about origin @EthanBierlein Link is fixed. :) Sep 16 revised 2D rotation of point about origin Fix broken link Sep 4 comment Function or relation: y^4 = 8x^2 You are correct; I have no idea what your friend is attempting to say, but his conclusion is certainly wrong. Sep 4 answered The sequence $x_{n+1}=ax_{n}+b$ converges to where? Sep 3 awarded Revival Sep 3 comment Is my work correct? (Easy problem, confidence intervals) Crossposted on stats: stats.stackexchange.com/q/169900/56303 Sep 3 comment What does the notation $11\mid a^2$ mean? @SilviaGhinassi It would actually be considered bad form and most likely ineffective to comment on that post. For one thing, the answer in question was written years ago and by a user who has not returned. No one will read the comment. Secondly, this is a disjoint question from before and is unrelated to the original topic of proving the irrationality of $\sqrt {11}$. Thus, it should be a separate question. While this might be a duplicate (but I'm on my phone right now so it's hard to check), it should not have been a comment. That's not what comments are for. Sep 1 comment 1, 5, 9, 13, 17, 21,… @Joshua You're confusing modular congruence with the binary modulus operation. The usage above is designating modular congruence. Aug 25 revised Find the least positive residue of $10^{515}\pmod 7$. Changed title to get this off the hot questions list. Aug 20 revised Double integral problem: $\int_0^\pi\int_x^\pi \frac{\sin y}{y} dy\, dx$ Title edit Aug 20 comment Proving that all integers are even or odd @JoeBlow It one of the Peano Axioms. As such, in Peano arithmetic, it cannot be false by assertion. For alternative arithmetic definitions and impact on induction, consider this question. Aug 20 comment Which one of the following versions of Bayes' theorem is correct? They're equivalent, based on the law of total probability.