i have i minecraft survival world but i want to invite worldwide friends to my world
How can I host my own Minecraft server?
Colors from a computer vs. colors from visible spectrum of sunlight Observation:  So, I know that all computer screens are able to project many different colors by varying how they display the RGB (Red, Green, Blue) pixels.  Question  What's the difference between say, yellow light (575 nm) from sunlight vs. the same yellow light that's displayed on the computer screen? Aren't they different? Is our brains mixing together the RGB lights together and its being interpreted as yellow light or is yellow light the same (575 nm) light that comes from sunlight actually hits our eyes?  Relationship between Fourier Series and light?  1) So I know that in Fourier Series, you have basis functions, sines and cosines that make up any other function depending on the coefficients that are in front of the sines and cosines terms.  2) I know that RGB colors on a screen are the "basis" for all the other colors that a computer screen makes up and the intensity of each of the RGB are like the "coefficients". So, am I making the correct relationship here? What's the best way to take a picture of an LCD or CRT screen? I have seen many bad pictures of LCD and CRT screens. How do I get a good picture of an LCD or CRT screen? How do I install iTunes on Ubuntu? I've tried different ways to install iTunes, but to no avail. I tried with Wine, but it didn't work. Is it possible to have iTunes on Ubuntu? Drawing line less than one pixel thick requires anti-aliasing in Android 4.2 The question asks it all really. When referring to a master's degree, do you use an apostrophe or not? That is, is it "a master's" or "a masters"? Prove that $f'(0)$ exists and $f'(0) = b/(a - 1)$ I have the following diagram:  \documentclass{article} \usepackage{amsmath,amsfonts,graphicx} \usepackage{algpseudocode} \usepackage{tikz, nth} \usetikzlibrary{arrows.meta,decorations,decorations.pathreplacing,calc,bending,positioning, chains}  \begin{document} \begin{tikzpicture}[scale=0.6]         \draw[thick,]  (0,8) -- (0,0) node[left] {0};         \draw[thick,]  (0,0) -- (8,0) node[right] {8};         \draw[thick,]  (8,8) -- (8,0) node[left] {};         \draw[thick,]  (8,8) -- (0,8) node[left] {8};          \draw[thick,]  (4,0) -- (4,8) node[left] {};          \fill (1, 4) circle[radius=2.5pt] node[below]{$A$};         \fill (2, 6) circle[radius=2.5pt] node[below]{$B$};         \fill (3, 2) circle[radius=2.5pt] node[below]{$C$};         \fill (4, 8) circle[radius=2.5pt] node[below]{$D$};         \fill (7, 3) circle[radius=2.5pt] node[below]{$E$};         \fill (6, 1) circle[radius=2.5pt] node[below]{$F$};         \fill (5, 7) circle[radius=2.5pt] node[below]{$G$};         \fill (3, 8) circle[radius=2.5pt] node[below]{$H$}; \end{tikzpicture} \end{document}   How can I position the caption of the node $D$ both below and left, so that the line doesn't obscure the caption? How can I get a history of running processes Given two sets$$A=\{1,3,5\}\quad,\quad B=\{1,3,8\}.$$ Then I compute the $A\setminus B=\{5\}.$   But my book$^\dagger$said: ... . Also, observe that $x\notin A\setminus B$ does not mean that $x\notin A\lor x\in B$. Why?  I don't know how to explain the Why, please give me some example.    $^\dagger$, second edition, page $4$.  EDIT: My intuition tells me that it does mean that. I guess there is some special case about null-set or about the restriction of the universal set. Why is it so difficult to pull an immersed mug out of the water? Suppose I put a mug in the water and then tilt it so that the water gets inside. It then floats due to buoyant force. But if I try to pull it out then a lot of force is needed. That's due to suction? What exactly happens at the moment when the force I apply is enough to pull the mug out? And what causes the loud pop sound when that happens? Is using passive voice "bad form"? What is the correct (most efficient) way to define the main() function in C and C++ — int main() or void main() — and why? And how about the arguments? If int main() then return 1 or return 0?  There are numerous duplicates of this question, including:       — For C++, with a very good answer indeed.     Related: Site specific magic comment links I would like site specific magic links. Currently you can write [so] in a comment, and it links like this: . I would like to be able to have site specific ones, so for example: English Language &amp; Usage  [dictionary] would go to http://dictionary.com and shows as   Ubuntu  [launchpad] would go to https://launchpad.net/ubuntu and shows as   [launchpad#bugnum] would go to https://bugs.launchpad.net/bugs/bugnum and shows as   [forums] would go to http://ubuntuforums.org/ and sows as   [discourse] would go to http://discourse.ubuntu.com and shows as   [paste] or [pastebinit] would go to http://paste.ubuntu.com and shows as   [install-d] would go to http://ubuntu.com/download/desktop/install-ubuntu-desktop and shows as   [install-s] would go to http://ubuntu.com/download/server/install-ubuntu-server and shows as   ppa:peterlevi/ppa would go to https://launchpad.net/~peterlevi and shows as   There is    Ask Different  [applesup] would go to http://www.apple.com/support and shows as   Christianity  [bible] would go to http://biblegateway.com and shows as   Currently, they are all the same, for all sites. I would like devs (mods maybe) to be able to add them on a per site basis. This is just a selection of examples. People can comment or answer with ones they would like and I'll edit them into this question. I asked this because  on Ask Ubuntu Meta wasn't possible right now - because it wasn't a feature.  [The devs] said right now it isn't possible because magic links are network wide, and they weren't sure it was high enough priority to really get done anytime soon, but if you want you can post a feature-request on Meta Stack Exchange requesting site specific magic links and see if you can garner more support for the feature and maybe get a dev to champion it.  So that's what I've done! Let $(a,b)$ and $(c,d)$ be intervals in $\Bbb R$, and find an injective and surjective function from $(a,b)$ to $(c,d)$ So here is this question I got stuck on:  Let $(a,b)$, $(c,d)$ be intervals (not sure if that's the correct term) on $\Bbb R$, so that $a&lt;b$, $c&lt;d$. Find an injective and surjective function $f:(a,b)\rightarrow(c,d)$.   Thanks in advance!   P.S. I get these question a lot. Is that some way of thinking, or some general method I should follow to make these question easier for me to solve? Is there any Stack Exchange site where I can ask others to recommend me good web sites for solving specific problems?  For example I would like to know if there is any URL shortening website that can allow me to define the url.  For example instead of http://bit.ly/1gX2dD0 I would like it to be http://bit.ly/superflow - if "superflow" is not available then I will invent another word.  I can imagine that such services are paid but I don't need the link to last more than one day, and maybe there is such a website. I'm including \usepackage{hyperref} so that each instance of \ref (as well as each page number in the index and the table of contents) automatically links to that page.  When I'm viewing the document (in ) and I click a link, I jump to the linked page.  Is there any easy way to go "back" to where I was before I clicked the link?  (And is the answer any different when using Adobe Acrobat reader?) Compiling C code in the terminal I've been having a problem with compiling.   I used the following test C code below and saved it as test.c in Home folder.  #include &lt;stdio.h&gt; int main() {   printf("Bruh!");   return 0; }   When I run in terminal the code   gcc test.c -o test   I get  nothing.  Thank you Need a matrix to seventh power which is the identity but the original is not or the negative identity The question on the homework wants a $2\times2$ matrix $R$, but $R$ not equal to positive or negative identity, that when you raise to seventh power you get the identity.  $R^7=\operatorname{Id}$.  I thought it would have to be some ones and negative ones,  it no luck, then tried some ones and some $.5$.  Just using an online matrix calculator to do brute force.  We just started talking about eigenvalues with visual example, so assuming wouldn't need that since we have not talked about how to find them yet.  Any hints or ideas to get me back on track? What is the difference between "citizen" and "denizen" Citizen: 1. A legally recognized subject ornational of a state or commonwealth, either native or naturalized. 2. An inhabitant of a particular town or city.  Denizen: 1. An inhabitant or occupant of a particular place.  Same thing? Piping STDERR vs. STDOUT According to "" (pg. 44), you can pipe only STDERR using the |&amp; redirection symbols.  I've written a pretty simple script to test this:  #!/bin/bash echo "Normal Text." echo "Error Text." &gt;&amp;2   I run this script like this:  ./script.sh |&amp; sed 's:^:\t:'   Presumably, only the lines printed to STDERR will be indented. However, it doesn't actually work like this, as I see:      Normal Text.     Error Text.    What am I doing wrong here?