Adding tags for SEO in clothing website
What are the best ways to improve a site's position in Google?
If two gravitational waves came in contact with each other what would happen? In another question entirely, what happens when a higher gravitational field interacts with a weaker one. Books for self-studying time series analysis? Using swap space instead of RAM can drastically slow down a PC.  So why, when I have more than enough RAM available, does my Linux system (Arch) use the swap?  Checkout my conky output below:    Also, could this be the cause of speed and system-responsiveness issues I'm having?  Output of free -m :  $ free -m              total       used       free     shared    buffers     cached Mem:          1257       1004        252          0         51        778 -/+ buffers/cache:        174       1082 Swap:          502        144        357 Calling Table with custom iterator I'm trying to understand how it's possible to always reduce the degrees of freedom of a system represented by $n$ coordinates $q_{i}$ for which holds $f(q_{1},...,q_{n})=0.$  For example, let's consider the system represented by $x+\cos y=5$. How can i show that this system has only 1 degree of freedom? What's the legal way to stream music online? It's really hard getting a definite answer on this so I'm going to ask it here. Is there a legal way to stream new music on a website without getting artist consent first. There seems to be a lot of popular sites like hotnewhiphop.com doing this that are hosting from both the US and Canada so I'm guessing there is a grey area that allows it. For the record I don't allow downloads of the music and simply stream each song in a player. How to find the square root of a permutation Observe that  $$\begin{pmatrix} 1 &amp; 2 &amp; 3 &amp; 4 &amp; 5 \\  2 &amp; 4 &amp; 1 &amp; 5 &amp; 3 \end{pmatrix} \begin{pmatrix} 1 &amp; 2 &amp; 3 &amp; 4 &amp; 5 \\  2 &amp; 4 &amp; 1 &amp; 5 &amp; 3 \end{pmatrix} =  \begin{pmatrix} 1 &amp; 2 &amp; 3 &amp; 4 &amp; 5 \\  4 &amp; 5 &amp; 2 &amp; 3 &amp; 1 \end{pmatrix},$$  so $\begin{pmatrix} 1 &amp; 2 &amp; 3 &amp; 4 &amp; 5 \\  4 &amp; 5 &amp; 2 &amp; 3 &amp; 1 \end{pmatrix}$ is the square of a permutation. More generally, how do I check if a permutation is square and how can I find its root? How to add citation for a whole paragraph? If I write a report and a whole paragraph is based on one source but not cited verbally it seems unnecessary to include the reference after every sentence:  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua (source 1). Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat (source 1).  Now I found a Phd thesis that puts the reference after the last dot of the paragraph to indicate that it is based on this very source:  Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. (source 1)  Is this a common practice? Is it generally understood? What are other ways to add the reference for a whole paragraph? i have a usb wifi adapter Tp-Link model: wn725n  it works very well on windows but i can't find any drivers for linux/ubuntu i tried everything online but nothing work so far  i'm using   Ubuntu 14.04.3 LTS  3.19.0-28-generic  laptop: hp probook 4540s  can you please help me install this adapter? WoeUSB Error Code 256 with NTFS formatted USB Assume I have a flight ticket from A->B->C and at A I checked in luggage all the way to C. However after the first flight I don't board the second flight but decide to remain in B.  As I understand procedures my luggage will need to be unloaded again from the plane in B when they notice I did not board the flight.    How and when can I retrieve my luggage at B? (Or if not, what is the fate of my luggage?) Is there any way I can advise airport/airline staff in B to not load my luggage in the first place? (I understand that asking to do so when checking in in A would be declined / met with a fare recalculation)   This question is different from  in that I am looking for a general answer, whereas in that case B happened to be the port of entry to the US where you have to collect your luggage in any case. Also it is different from   in that I do want to check in  luggage from A to B. Finally I am also aware that possible further legs of my trip would be cancelled.  is asking essentially the same but was marked duplicate to the above two questions that do not answer my question. Why are `/dev/ptmx` and `/dev/pts/ptmx` not device files? says     On Linux, using devpts, there is no master device file. The process on the master end uses a file descriptor, which it gets by opening ptmx, but there’s no corresponding device node.   Did the author refer to /dev/ptmx or /dev/pts/ptmx?    Why are /dev/ptmx and /dev/pts/ptmx not device files? What types of files are they?  What is the difference between /dev/ptmx and /dev/pts/ptmx?  Thanks.  On Lubuntu 18.04  $ file /dev/ptmx  /dev/ptmx: character special (5/2) $ file /dev/pts/ptmx  /dev/pts/ptmx: character special (5/2)  $ sudo su  # stat -L /dev/fd/3 3&lt;&gt; /dev/pts/ptmx   File: /dev/fd/3   Size: 0           Blocks: 0          IO Block: 1024   character special file Device: 15h/21d Inode: 2           Links: 1     Device type: 5,2 Access: (0000/c---------)  Uid: (    0/    root)   Gid: (    0/    root) Access: 2018-11-21 13:39:10.544000218 -0500 Modify: 2018-11-21 13:39:10.544000218 -0500 Change: 2018-11-21 13:39:10.544000218 -0500  Birth: -  # stat -L /dev/fd/3 3&lt;&gt; /dev/ptmx   File: /dev/fd/3   Size: 0           Blocks: 0          IO Block: 4096   character special file Device: 6h/6d   Inode: 87          Links: 1     Device type: 5,2 Access: (0666/crw-rw-rw-)  Uid: (    0/    root)   Gid: (    5/     tty) Access: 2019-01-06 07:19:54.372098540 -0500 Modify: 2019-01-06 07:19:54.372098540 -0500 Change: 2018-11-21 13:39:30.372098540 -0500  Birth: - I recently moved from having a main site like www.example.com with a subdomain associated site yyy.example.com, to moving everything off the subdomain to a subdirectory like www.example.com/yyy/, with the same hierarchy underneath the subdirectory, and now yyy.example.com is just a redirect page to the subdirectory, so yyy.example.com/abc/page-x is redirected to www.example.com/yyy/abc/page-x and so on.  The effect has been that the traffic increased by several times (the total page views are more than ten times at the present rate) what it was to the yyy subdomain. Previously almost all of the traffic to the yyy subdomain was from the www site. This is from monitoring the old yyy site for a year or more.  I'm curious to know if there's any research or results which would indicate whether this is universal (subdirectories beat subdomains) or "just me". Prevent Photos app on OSX from launching when plugging in device Can anybody explain about real linear space and complex linear space? This is definition      "A real linear $V$ is said to have an inner product if for each pair of elements $x$ and $y$ in $V$, there corresponds a unique real number $(x.y)$ satisfying what we know as axioms for inner product."    What does it mean? $(x.y)=xy$ and $xy$ is a real number?   When $(x.y)$ is complex, it is called complex space, does that mean that $(x.y)=xy=$ complex?   I don't understand what inner product is. What is the Necessity of $...$ Around Numbers? I typed up an assignment with a lot of numbers in LaTeX and turned it in to my adviser.  When he returned it to me with some corrections, one of which was a lot of $ around my numbers.  I understand that $ are necessary around some mathematical formulas, but I was just using numbers like -2 and 4.  I did not see any change in the font of the numbers when I added the $ either.  Since my adviser did not want to give me an explanation, what is the rationale? I'm looking for the title of a short story by Ursula Le Guin about a scientist (?) who is given a drug that slows the timescale of his perception enormously, so that he can perceive that an alien (?) forest is actually behaving as a sentient being, reacting to current events, but at an enormously slow (from a normal human point of view) timescale. It might be in , but I don't remember the title (and it doesn't jump out at me from the list of titles) and don't have access to that collection right now. It is not &quot;The Word for World is Forest&quot;, nor &quot;Direction of the Road&quot; (from ), nor &quot;Vaster than Empires and More Slow&quot;, the latter two of which look at similar plant perception/time-scale issues. Update: it turns out that the description was right, but I had most of the details wrong: not Le Guin, not alien, not a scientist ... Anyone know if R has quote-like operators like Perl's qw() for generating character vectors? Types in MySQL: BigInt(20) vs Int(20) I'm currently reading Marcus' "Number Fields," and I'm having difficulty proving the following result:  Corollary 2.2: Let $m$ be a squarefree integer. The set of algebraic integers in the quadratic field $\mathbb{Q}(\sqrt{m})$ is $$ \left\{ a + b \sqrt{m} : a,b \in \mathbb{Z} \right\} $$ if $m \equiv 2,3 \pmod{4}$; and$$ \left\{ \frac{a+b\sqrt{m}}{2} : a,b \in \mathbb{Z} ~,~ a \equiv b \pmod{2} \right\}$$ when $m \equiv 1 \pmod{4}$. $\square$  It is easy enough to see that the claimed sets do, indeed, consist of algebraic integers. The other half of the proof proceeds something like this: suppose that $\alpha = r + s \sqrt{m}$ is an element of $\mathbb{Q}(\sqrt{m})$. Then $\alpha$ is a root of the polynomial $$ x^2 - 2rx + r^2 - s^2m $$ In particular, this means that $\alpha$ is an algebraic integer if and only if both $2r$ and $r^2 - s^2 m$ are integers. At this point, the proof stops, and says that this implies the result. And therein lies the problem: I don't see how to make the connection. I do know, for example, that if one of $r,s$ is an integer, then the other one must be, too, i.e., either both are integers, or both are not. However, I cannot get any further than that. Can anyone give me a gentle nudge in the right direction? Thank you very much!