Difference between "I have got to study on weekends" and "I have to study on weekends"? What is the difference between "I have got to study on weekends" and "I have to study on weekends"?
Confused! Are there any differences between "I have to go", "I had to go", "I've had to go", "I get to go", "I got to go", "I've got to go"? I am Confused!   Are there any differences between "I have to go", "I had to go", "I've had to go", "I get to go", "I got to go", "I've got to go"?  In which situation is each term used?  I checked this dictionary , &amp; found that      get to do something:  to have the opportunity to do something   Seem like if you have a opportunity to do something, then use "get".  The expression is in present but why we use present perfect tense (Ex: I've got to go) here?
How to show every field is a Euclidean Domain. I'm having trouble proving this. This is what I have so far:  Let $F$ be a field. Let $v(x) \rightarrow 1$ for all $x$ not equal to $0$.  So if we let $x$ be in $F$ where $x$ not zero then we can write $x$ as: $x=qy+r$ for some $y$ in $F$. If $r$ not zero then $V(r)=1$.  Not sure what to do from here. I know eventually I'm supposed to get no remainder $(r=0)$ but I'm stuck at applying the definition and valuation map. How to pick a specific symbol from a specific font? Difference between wouldn't and didn't What is the difference between would not and did not?  For example:     I called my girlfriend but she wouldn't stop.   I called my girlfriend but she didn't stop. A very basic question concerning the $R^2$ of OLS regressions   run OLS regression y ~ x1, we have an $R^2$, say 0.3 run OLS regression y ~ x2, we have another $R^2$, say 0.4 now we run a regression y ~ x1 + x2, what value can this regression's R squared be?   I think it's clear the $R^2$ for the multiple regression should be no less than 0.4, but is it possible for it to be more than 0.7? How does Delta baryon decay conserve angular momentum? ALERT! /dev/disk/by-uuid/xxxxxxxxx does not exist. Dropping to a shell I am using Ubuntu 14.04.  I ran in terminal sudo apt-get update. Then I rebooted the system. And now I see:   ALERT! /dev/disk/by-uuid/xxxxxxxxx does not exist. Dropping to a shell initramfs:_   I can't boot up LIVE Ubuntu from USB flash drive. Yes, I double checked BIOS setup and the USB flash drive is OK and runs on another machine. Right now I am going to buy a  DVD and burn a Live DVD from another laptop.  sudo blkid gives me:   /dev/loop0: TYPE="squashfs"   /dev/sda1: UUID="xxxx" TYPE="ext4"    /dev/sr0: LABEL="Ubuntu 14.04.1 LTS i386" TYPE="iso960"      /etc/fstab has the same UUID="xxxx" and there is a line with:   errors=remount-ro 0      I tried using boot-repair but I still can't log in to Ubuntu.  I don't want to reinstall Ubuntu, because I have a lot of data there.  Do you have any advice how this can be solved? Truncate a string to first n characters of a string and add three dots if any characters are removed From question . You have to use \r when replacing text for a newline, like this  :%s/%/\r/g   But when replacing end of lines and newlines for a character, you can do it like:  :%s/\n/%/g    What section of the manual documents these behaviors, and what's the reasoning behind them? Confidence interval for the p-value estimate when doing Monte Carlo testing The second paragraph of the  section of the Wikipedia article on resampling statistics, the values of a confidence interval for a p-value from a MC sampling is given:     After $N$ random permutations, it is possible to obtain a confidence interval for the p-value based on the Binomial distribution. For example, if after $N = 10000$ random permutations the p-value is estimated to be $\hat{p}=0.05$, then a 99% confidence interval for the true $p$ (the one that would result from trying all possible permutations) is $[0.044, 0.056]$.   What's the formula to calculate it? When using the ssh or ftp commands from the Bash shell, does the server that I am connecting to learn of the domain name used? I understand that the domain name is locally translated into an IP address via DNS. In HTTP, after that happens, the server is told the original domain name as well in order to serve the correct page, or to present the correct TLS cert (SNI).  host serverfault.com GET /   Does a similar phenomenon happen when connecting to ssh or ftp?  I ask because I am  trying to ssh into a server (GoDaddy webhosting) which expects a domain name, but is not letting me in when I try to connect via user@IPaddress as the DNS is not yet moved to the GoDaddy IP address. How to protect SHTML pages from crawlers/spiders/scrapers? I have A LOT of SHTML pages I want to protect from crawlers, spiders &amp; scrapers.   I understand the limitations of SSIs. An implementation of the following can be suggested in conjunction with any technology/technologies you wish:     The idea is that if you request too many pages too fast you're added to a blacklist for 24 hrs and shown a captcha instead of content, upon every page you request. If you enter the captcha correctly you've removed from the blacklist.   There is a whitelist so GoogleBot, etc. will never get blocked.   Which is the best/easiest way to implement this idea?  Server = IIS    Cleaning out the old tuples from a DB every 24 hrs is easily done so no need to explain that. Understanding backtick (`) Why didn't Isildur's Heir come forward sooner? Comprehensive list of activation functions in neural networks with pros/cons Are there any reference document(s) that give a comprehensive list of activation functions in neural networks along with their pros/cons (and ideally some pointers to publications where they were successful or not so successful)? Help ID this plant, quite possibly a weed I found this plant near my South Indian home in , India. Most probably it could be some sort of weed. Anyhoo, is this plant of any medical or commercial value? Is it a remedy for something?   It has a white tap root with little veins off the main root It has a really small yellow flower It's leaves are similar to that of a clover, except for that it has three to five leaves        Merci d'avance!  (P.S. Forgive me if this is some very common plant that I should know about, I'm in 7th grade.) Filter dict to contain only certain keys? I am a little bit confused about the Area Under Curve (AUC) of ROC and the overall accuracy.  Will the AUC be proportional to the overall accuracy? In other words, when we have a larger overall accuracy will we definitely a get larger AUC? Or are they by definition positively correlated?  If they are positively correlated, why do we bother reporting both of them in some publications?  In real case, I performed some classification task and got the results as follows: classifier A got an accuracy 85% and AUC of 0.98 and classifier B got an accuracy of 93% and AUC of 0.92. Question is, which classifier is better? Is it possible to get results similar to these (or do my results indicate a bug in my implementation)? Sometimes it’s possible to use either a noun adjunct or the possessive case.     the shop door   the shop’s door   However, in certain phrases it’s not OK to do so.     the ship’s crew (the ship crew is wrong)   The questions are:   How can one find out what to use in such cases as “the shop(’s) door” when a noun adjunct option and the possessive case option are available?  How can one know which option is wrong in order to avoid the construction “ship crew”? Is there a difference in meaning between (a) the shop door (b) the shop’s door? Prove that subsequence converges to limsup Given a sequence of real numbers, $\{ x_n \}_{n=1}^{\infty}$, let $\alpha =$ limsup$x_n$ and $\beta = $ liminf$x_n$.   Prove that there exists a subsequence $\{ x_{n_k}\}$ that converges to $\alpha$ as $k \rightarrow \infty$.   Not sure how to start this without since I'm not given that the subsequence is bounded.. What's the difference between TRUNCATE and DELETE in SQL What's the difference between TRUNCATE and DELETE in SQL?  If your answer is platform specific, please indicate that.