I've been given a Schengen visa valid for 1 month.  Unfortunately, I won't be able to travel during the dates I've specified in my application.  What should I do?  Do I just not use the visa?  Or should I let the embassy know so they can cancel it?
I'm granted a one-entry Schengen visa and now I can't go. Will having an unused visa in my travel passport have any consequences like future visas refusal? Do I need to do anything special?
When you add a new object into the blender scene, normally on the tool shelf a window will become available where you can put in the objects size or number of vertices etc.  These options:   For what-ever reason, when I now add an object I am no longer seeing that area where I can alter the measurements. Currently I want to use the Spin function but I need to alter it but I have no way of effecting how the spin operates. Does anyone know what I have done or how to fix it? I have upgraded from Ubuntu 16.04 LTS to Ubuntu 18.04 LTS. I was surprised to see that the context menu entry "Make Link" (keyboard shortcut Ctrl+M) in Nautilus doesn't seem to exist anymore. It used to appear upon right mouse click on a file or folder and allowed the user to create a symbolic link. How do I use Drush 8 site aliases in Drush 9? What happens when identical overlapping effects have their end-condition met? Create keyboard shortcuts for touch bar's functions I have broken the touch bar in my MacBook Pro 13". Only the ESC key keeps working.  Replacing the touch bar may be expensive so I'd like to know if it is possible to replace its functions with keyboard shortcuts.  The functions I am highly interested in are:   volume screen backlight keyboard backlight What’s the best way to reload / refresh an iframe? I would like to reload an &lt;iframe&gt; using JavaScript. The best way I found until now was set the iframe’s src attribute to itself, but this isn’t very clean. Any ideas? How to control the coordinates in Tikz & Matrix? I use Tikz with Matrix because I need to draw arrows and write on and beside the matrix. However, I don´t control the coordinates well other than using trail and error. For instance in the matrix below I have put an X at (0,0) and it is not in the centre of the matrix. However, if the matrix is 4x4 than it is in the centre. Is there any convenient way to know the coordinates? \documentclass[border=1cm]{standalone}  \usepackage{tikz} \usetikzlibrary{matrix}   \begin{document}  \begin{tikzpicture} \matrix(m) [matrix of math nodes, nodes in empty cells, nodes={minimum size=1cm, outer sep=0pt, text height=1.5ex, text depth=.25ex}] {  36     &amp;   &amp; 32    &amp;   &amp; 33    &amp;   \\         &amp;   &amp;       &amp;   &amp;       &amp;   \\  10     &amp;   &amp; 8     &amp;   &amp; 7     &amp;   \\         &amp;   &amp;       &amp;   &amp;       &amp;   \\  12     &amp;   &amp; 17    &amp;   &amp; 16    &amp;   \\         &amp;   &amp;       &amp;   &amp;       &amp;   \\  23     &amp;   &amp; 15    &amp;   &amp; 16    &amp;   \\     &amp;   &amp;   &amp;       &amp;   &amp;       &amp;   \\ };  \draw (m-1-1.north west) rectangle (m-8-6.south east);    % Lineas horizontales \foreach \i in {2,4,6,8} {   \draw (m-\i-1.south west) -- (m-\i-6.south east); }  % Lineas verticales \foreach \j in {2,4,6} {   \draw (m-1-\j.north east) -- (m-8-\j.south east); }  % dual ui \node [font=\color{red}] at (3.5,3) {$\ge 10$}; \node [font=\color{red}] at (3.5,1) {$\ge 8$}; \node [font=\color{red}] at (3.5,-1) {$=4$}; \node [font=\color{red}] at (3.5,-3) {$=3$};  % dual vj \node [font=\color{red}] at (-2.5,-5) {$\le12$}; \node [font=\color{red}] at (-0.5,-5) {$=12$}; \node [font=\color{red}] at (1.5,-5) {$=6$};  \node [font=\color{red}] at (0,0) {X};  \end{tikzpicture}     \end{document} SharePoint Migration 2007 to 2013 Dimensions with Rank-Nullity question $f:V \rightarrow V$, $\dim(V) = n$  a) If $n$ is odd, prove that there does not exist a linear transformation with $\operatorname{im}(f) = \ker(f)$  b) Is it false to affirm the previous statement if $n$ is even?  My answer: $$ i = \dim(\operatorname{im}(f))\\ k = \dim(\ker(f)) \begin{cases} n=2i                           &amp; \text {if $i=k$} \\ n=i+k   &amp; \text{if $n\neq k$} \\ \end{cases}  $$  b) Yes.  Is that a valid proof? I have a live USB made with the standard Ubuntu disk image creator for 16.04 LTS. In the current state, I can boot to this disk, but it still requires the original USB to run properly at all times.  Attempting to pull the drive and use the system generates a large amount of I/O errors, further suggesting that the USB drive is actually needed for things not already loaded into RAM (For example, Firefox worked without the USB, but I used it once before already. apt, on the other hand, did not.)  Is there a way to copy the entire Ubuntu live disk to RAM, so I can remove the drive and free up a USB slot for other things? What does ** (double star/asterisk) and * (star/asterisk) do for parameters? Draw integers independently & uniformly at random from 1 to $N$ using fair d6? Limit position rigidbody How can I limit the position of a rigidbody, between two values ​​if I use this code:  public Vector3 dir;  Rigidbody rb;  void Awake() {     rb = GetComponent&lt;Rigidbody&gt;(); }  void FixedUpdate() {     rb.velocity = new Vector3(0f, 0f, 6f);      rb.AddForce(dir * 1f, ForceMode.VelocityChange); }   If I use Vector3.Clamp then the object will shake How to construct semi direct products between Q and H There is a semi direct product if you go $\theta: Q \rightarrow Aut(H)$.  $H = C_{17}, Q = C_2$.  $Aut(H)\cong C_{16}$.  From here, how do I construct the semi direct products?   I said, in $C_{16}$, there are two elements of order that divide $2$, which are $1$ and $2$. Therefore there are two semi direct products. Also $17 \times 2 = 34$ tells me that in both semi direct products there will be $34$ elements.  How do I construct the semi direct products from here though? Why don't players get extra xp for large encounters? Based on the table Encounter XP Multipliers from the Basic Rules' DM section, Page 57, when you're building encounters in 5E, you include an XP modifier depending on the number of creatures your PCs will be fighting: 1.5x for a pair, 2x for 3-6 and so on. However, the PCs only get the base XP as a reward.     This doesn't change the actual xp reward ... just your calculations of how difficult the encounter is.   Why is this? After acknowledging that battles vs multiple opponents are more difficult, why not reward them as such? Get complete stats of process started/terminated during login of user account When I login, I notice many process quickly start and terminate in task manager. But it happens very fast and I cannot save details about them (like process name, command line, CPU usage,..)  How can I collect stats about them so I can view them later How can I check the existence of an element in jQuery?  The current code that I have is this:  if ($(selector).length &gt; 0) {     // Do something }   Is there a more elegant way to approach this? Perhaps a plugin or a function? I've been building my own emacs because I want to fix some issues in it and get the bug fixes upstream. However, Ubuntu keeps automatically removing my own built emacs and I have to keep rebuilding and reinstalling it.  Here's my output of apt-cache policy emacs when I went to bed last night:  ~/emacs$ sudo apt-cache policy emacs emacs:   Installed: 26.0.50.aaron-1   Candidate: 46.1   Version table:      46.1 500         500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages         500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages  *** 26.0.50.aaron-1 100         100 /var/lib/dpkg/status   Here it is when I wake up:  ~/emacs$ sudo apt-cache policy emacs [sudo] password for excelsiora: emacs:   Installed: 46.1   Candidate: 46.1   Version table:  *** 46.1 500         500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages         500 http://us.archive.ubuntu.com/ubuntu xenial/main i386 Packages         100 /var/lib/dpkg/status   Why is this package being versioned at 46 instead of 24 or 25? 26 is the currently the highest major emacs version you can get.   I can see that this is a meta-package:   Why is Ubuntu updating software without asking?  Main Question: What am I supposed to do - assign my package version a number higher than 46 just to make it stick?   That seems like a horrible hack, or maybe that's how it's supposed to work? Confidence Interval Calculation I have temperature data of July 1991 to 2007, and wants to find the Confidence Interval at 95%, which distribution is best fit the data, Z or T. Please give me reason also.    minTemp = 14.4444, maxTemp = 38.3333, SizeofData = 527, (17 years) hist(July, 20), histfit(July, 20); Moment generating function of the natural sufficient statistics of Gamma distribution I have $X_1,X_2 ... X_n$ Gamma-distributed r.v with density:    First of all I showed, that Gamma distribution belongs to exponential family and can be represented in form     I found, that for Gamma distribution $B(\theta) = log(\theta)$ where $\theta$ is $\alpha/\beta$  Then we know, that moment generating function of the random variable $T(X)$ is given by $$M(t)=\exp\{B(\theta+t)-B(\theta)\}$$  Natural sufficient statistics for Gamma distribution is:    But I didn't understand what should I do next? Because Natural sufficient statistics is two dimensional it confuses me:  $M(T) = exp[log(\theta + T) - log(\theta)]$  and $T = [s,t]^\intercal$