Whenever I do a question and it receives a large number of downvotes, I usually tend to delete them instead of editing, as I am nervous about losing my reputation. From my past experience with Stack Exchange, I always knew that deleting questions can get your reputation back.   Oddly enough, when you delete a question in hopes of earning your reputation back, it will take a long period of time to earn it back. Earning your reputation can take about several minutes to half an hour.  Should this issue with having to wait a long amount of time be fixed?
Update (March, 2012): This has been rolled out to all sites in the network.    Behind the scenes we've been hard at work making some changes to how we track reputation.  Here are some of the issues we're aiming to address with these changes:   Reputation Skew (your actual reputation doesn't match what's shown) Up/Down votes oddities (mostly with the daily rep cap, the magical +2) Historical Deletes (not impacting rep immediately, contributing to skew) Unaccepts (display issues in the profile) User Deletion (magically missing rep, another skew contributor)   To be clear: reputation values are not changing, every action in the system is still worth the same amount.   Here’s what will be different:   Your reputation will be correct at all times Deletions will have a much more immediate effect on reputation, not waiting on a recalc  (but reputation sync takes up to 5 minutes on a delete/undelete action; as to not block the user's response thread, it's offloaded to a background queue) Recalcs will no longer be necessary Up/Down vote reversals will restore the correct reputation amount Up/Down vote reversals will correctly adjust to the reputation cap The reputation history in your profile will be more detailed and accurate (e.g. when a post is deleted, you'll see that in the reputation tab of your profile)   This means your reputation will go up and down more than it has previously, but it will be in sync.  To think of it more easily: imagine that a recalc will be done after every action in the system.  Probably the biggest impact many will be concerned with is that you may see your reputation drop in cases where it didn't seem like it did before  This was effectively happening before, but the results of that change were not applied immediately, but on the next rep recalc.  Post deletion is the biggest factor here, previously it didn't (immediately) account for the reputation impact...that will no longer be the case.  Reputation changes from the deletion will now be applied within the hour, and most other changes will be instant.  Now the part that will make everyone throw vegetables our way:  this will require a global recalc to get everything in sync.  We'll be rolling it out first here on meta, then the rest of the network...the enabling of the detailed rep view and global recalc on each individual site will coincide.  During the rollout you will see empty reputation tabs on profiles as we transition to the new storage behind the scenes, they'll be restored as the recalc rolls though each user.  We’ll put up a blog post on  before the network-wide rollout.  If you have any questions about this change or details I may have left out, please do so in answers below so that we can clear up as much as possible before this rolls out.
Java Command line arguments If $A\subseteq\mathbb N$ and $\sum\limits_{a\in A}\frac1a$ converges then $A$ has natural density $0$ In this  to a question about a series, a theorem was stated:     If $A= \{a_i \}$ is a set such that $\sum_{i = 1}^{\infty} \frac{1}{a_i}$ converges, then $d(A) = 0$, where $d(A)$ is the  of the set.   My background in number theory is basically zero and all my attempts to prove this have been utterly unseccessful; would anyone please help me, or at least provide me with a hint to prove it? What does --shell-escape do? I stumbled upon an example, which needed to be compiled with the additional option --shell-escape. Using this option it worked just fine, but I'm curious:     Why or when is this option needed and what does it actually do? Why's &quot;what's up&quot; used as greeting among young people? It sounds like asking &quot;what is up there&quot;?  A: What's up? B: The sky. I used to edit the startup script for the GDM (/etc/gdm/Init/Default) to permanently change my display resolution.   How can I do this with LigthDM in Ubuntu Oneiric? How to programmatically send SMS on the iPhone? Does anybody know if it's possible, and how, to programmatically send a SMS from the iPhone, with the official SDK / Cocoa Touch? I’m able to copy-paste from any application to any application. I’m able to copy from a comment or from a question or from an answer. I’m able to paste to a question or answer. However, if I attempt to paste into a comment, nothing happens. I am able to subsequently paste into another application, confirming that the text is actually on the clipboard.   However, copying SE links will paste them successfully, but all other text - including other links - still fails. This leads me to believe that it’s a SE issue and not an Apple one.   This has been an issue since 11.0 beta and persists through iOS 13 release. How can I '\input' a file without getting the implicit newline? Is it possible to convert virtual machines to physical environments? verb or adjective in "The blue page is *stapled* to the red page"? NULL in MySQL (Performance & Storage) What exactly does null do performance and storage (space) wise in MySQL?  For example:  TINYINT: 1 Byte TINYINT w/NULL 1 byte + somehow stores NULL? Can you overload controller methods in ASP.NET MVC? I'm curious to see if you can overload controller methods in ASP.NET MVC.  Whenever I try, I get the error below.  The two methods accept different arguments.  Is this something that cannot be done?     The current request for action 'MyMethod' on controller type 'MyController' is ambiguous between the following action methods: Unable to get wireless netgear WNDA3100v2 to work From Manila to Canada via France and Italy I intend to apply for a tourist visa to Canada and a tourist Schengen visa. My itinerary will be from Manila to Paris, France to Rome, Italy then Canada where I plan to visit/stay for 2-3 months with an invitation letter from my daughter who is a permanent card holder. I understand I have to buy a return  ticket from Canada to Manila where I reside. Is this a feasible itinerary?  Will this affect my chance of getting a Schengen or even a visa to Canada as this is my first time to apply for a tourist visa to these countries although I have been to several countries in Asia like Japan, Korea, Hongkong, Macau, Singapore, Thailand, Malaysia, Indonesia, Vietnam, Cambodia to name a few. Will the consul in the France Embassy here in Manila look for a return flight from a member country to Manila? The problem is stated as follows:  "Let $R$ be a Noetherian ring and $\theta$ be a ring homomorphism from $R$ to $R$. Show that if $\theta$ is surjective then it is also injective."  Regardless of the right solution, I don't understand why is the following wrong:     We have $\theta: R\to R$. By the isomorphism theorem $R/\ker\theta\cong\operatorname{Im}\theta$. Since $\operatorname{Im}\theta = R$, it follows $\ker\theta =0$, so it's injective.   Harsh criticism will be appreciated. Thanks. Let $A,B$ be real symmetric matrices, and for any $n\in \Bbb N^{+}$, and for all $x,y\in \Bbb R$, we have $$tr(xA+yB)^n=x^ntr(A^n)+y^ntr(B^n).$$  Show that $AB=0$.  My try:since $$(xA+yB)^n=x^nA^n+\binom{n}{1}x^{n-1}A^{n-1}yB+\cdots+\binom{n}{n-1}xA(yB)^{n-1}+y^nB^n$$ so $$tr\left(x^nA^n+\binom{n}{1}x^{n-1}A^{n-1}yB+\cdots+\binom{n}{n-1}xA(yB)^{n-1}+y^nB^n\right)=x^ntr(A^n)+y^ntr(B^n)$$  then  $$tr\left(\binom{n}{1}x^{n-1}A^{n-1}yB+\cdots+\binom{n}{n-1}xA(yB)^{n-1}\right)=0$$ so $$\binom{n}{1}x^{n-1}ytr(A^{n-1}B)+\cdots+\binom{n}{n-1}xy^{n-1}tr(AB^{n-1})=0$$ then I can't  I found this is a nice result, maybe this is an odd problem, and I can't solve it. Thank you. How do I rename a directory via the command line? Unable to Telnet into port 25 on CentOS PostFix Server VirtualBox 5.0.40 crashes the whole host since update to kernel 4.13.0-26-generic How can I get a copy of a Canadian visa refusal letter?