[See the notes below about duplicate questions.]  We have a friend whose site sells different types of things-- rare coins, jewelry, fine art, antiques, etc.  For SEO reasons (creating a high-quality information site about each market/topic), we were wondering if it was better to keep this all together as one site, with a somethingcoins.com type URL (and so jewelry would be somethingcoins.com/jewelry), or whether we should create a separate somethingjewelry.com and target that whole site on jewelry products and related information, to be an authority in that one jewelry market.  So I guess the question is, for Google rankings, is it better to have multiple small sites which are each focused on a single topic/market?  Will this lead to higher authority for the site?  Or should we continue to group them all (like somethingcoins.com/jewelry) and trust that the aggregate number of inbound links and overall site authority will be better this way?  It also seems more difficult for somethingcoins.com/jewelry to compete against other sites that are targeted/focused on jewelry only (or am I maybe wrong about that?).  RE: DUPLICATE QUESTIONS. I know there are other questions here about multiple domains, but those seem to be asking how to redirect multiple top-level domains into a single site, or to show a single site's content on multiple top-level domains, possibly in different languages, but all assuming that the site content itself makes sense as one collection of pages. Our question here is different--- mostly asking if their current collection of coins, jewelry, art, etc, makes sense to group together on a single site if we're trying to create an authority site for each of those markets.  Thanks so much for your feedback and ideas.  UPDATE #1 re: DUPLICATE QUESTIONS. I should clarify that I'm not suggesting multiple domains like buygoldjewelry.com, buycheapjewelry.com, etc. which is the focus of the linked "Duplicate" question above.  I agree with the advice on that question, that Google wants you to build a brand.  But aren't BrandCoins.com and BrandJewelry.com two completely separate sites, target audiences, and markets?  Each can be a solid information site for the particular market, since they are very different (rare coins vs. fine art, for example).  Or more importantly, doesn't combining these all to just Brand.com/coins and Brand.com/jewelry actually LOWER the authority of the overall site in each category, when it competes against other sites focused on ONLY jewelry, for example?
I have a website with software applications. Is it good for SEO to choose one keyword rich domain name for each of our software products or should we stick to a single domain?  From a user's perspective I think it would be easier to remember a domain that is keyword rich as the user will instantly know what this product is for.  But I have read articles that the latest trend in SEO is to stick to one domain for all of your products and invest on this single domain website.  Is that true? What do you advise? Should I register a separate domain for each of our products or should I use only one single domain?  Should I do a 301 redirect with a .htaccess to a single domain? And what about the sitemaps? Should I register all sites in Google Webmaster Tools and post a separate sitemap for each one of them? should my main site sitemap include all pages or should separate domains have their own sitemaps?
What does limit actually mean? I have been in a deep confusion for about a month over the topic of limits! According to our book, the limit at $a$ is the value being approached by a function $f(x)$ as $x$ approaches $a$.  I have a doubt that in real number line we can never ever reach the closest value to $a$ because always a more closer value will exist.  Now when talking about our methods for calculating limit, what method comes in our mind when we have to calculate where the value approaches? Let's say we have to find what value $f(x)$ approaches when $x$ moves from $[0,a)$.  So we calculate the value of $f(x)$ at $x=0$, say $4$, and then at $x\to a$.   But the problem is that we don't know the value $x\to a$, so we say the value is $a-h$ where $h\to 0$ and calculate the value of $f(a-h)$, say $5-h$.  Now here is where my doubt starts! In the final step we put the value of $h=0$ say in that it is an infinitesimal quantity.  My doubt is that $h$ was tending to $0$ means that it was never equal to zero  maybe it is infinitesimally small, not a stationary value, not an imaginable value, but we know for sure that it is not  equal to $0$. Maybe it is the point closest to zero, but it is not equal to zero and when we use the result $5-h=5$ we are actually making an error which is tending to zero. Maybe the error is very small, but still, there is some error in that we cannot calculate it but we can see that there is this infinitesimal error present.  That means we don't get the exact limiting value or last value of $f(x)$.  $x$ belongs to $[0,a)$ but a value approximate to infinitesimal? Isn't it right! We get an approximated value? Is there a safe way to run a diff on two zip compressed files? Seems this would not be a deterministic thing, or is there a way to do this reliably? Yes, I'm a moron, and I tried to manually install a higher point release of python 2.7.16 to /usr/bin/  (i did ./configure --prefix=/usr) on my Ubuntu 16.04 machine. It seems to work fine EXCEPT for packages that depended on python, like apt-listchanges, which fails with messages like ImportError: No module named apt_pkg  there's no make uninstall available, I've tried manually removing files, and still when I try apt --reinstall install python, Nothing gets overwritten and the python executable still gives the new 2.7.16 version...   Any idea how to get the official repository version back?? Answers in top Network Posts showing incorrect score There is already a question  which is posted around a month ago (which was fixed). My question reports a similar issue of showing inaccurate scores along with another bug.   A couple of answers in the Top Answers in my network profile are showing incorrect score.         As we can see they are showing a score of 10. But as of writing this question, the score of both the answers is 9.  and  both have a score of 9 instead of 10.  Even though the current score is 9, both these answers reached a score of 10 a few months ago and I was awarded  for both.         The vote was removed either when a user was removed or there was an unupvote. As far as I can tell, I don't remember an unupvote notification in the achievement box from these answers. My guess is the votes are removed when user accounts were deleted.   So, I suspect the score of answers in Top Network Posts is not updated either when there is an unupvote or a vote thrown away due to account deletion.   Is this the right reason why score is inaccurate? Can this be fixed? Command line option to check which filesystem I am using? Is there a command that will show which file system (ext3, ext4, FAT32, ...) the various partitions and disks are using?   Similar to how sudo fdisk -l lists information about disks and partitions? Okay, so I understand what calculus, linear algebra, combinatorics and even topology try to answer (update: this is not the case in hindsight), but why invent category theory? In Wikipedia it says it is to formalize. As far as I can tell, it sort of generalizes a bunch of fields in mathematics, like in topology, graphs and groups we have isomorphisms and automorphisms and homomorphisms, it seems to me like it just finds a bunch of results that are true to these functions in a bunch of disciplines. But why would generalizing that be of use? I mean, wouldn't it be easier to prove them specifically in each of the important disciplines? Why is the edit button disabled? How to monitor bandwidth use of each device on wifi network What does the '=>' syntax in C# mean? What counts as a 'large' raid 5 array? What do the words 'RELATED' and 'ESTABLISHED' individually signify in RELATED,ESTABLISHED state in iptables? "the police conspiracy" vs. "the police's conspiracy" The  doesn't give me much hope, but I'm hoping it's an undocumented (and/or GNU-specific) feature. Is it necessary that an International cricket ground should has the boundary line in circle shape?Is it allowed by ICC to make it a square or ellipse or any other? What is the minimum and maximum area allowed for an international cricket ground? What is the maximum number of international cricket grounds that a country allowed to have? How to add Windows to GRUB I have my encrypted Archlinux installed on my SSD. Now I have one HDD with Windows installed. But in my GRUB just Archlinux is shown (no Wonder, because I just installed Windows on the other HDD, GRUB doesn't know of that by now.).  My Question is, how do I properly add my Windows-HDD to GRUB, so that I can choose which to boot when starting?  I am a little bit afraid of destroying my GRUB so I can't boot my encrypted Archlinux anymore.  Thanks! How does Linux kernel compare to microkernel architectures? I read once that one advantage of a microkernel architecture is that you can stop/start essential services like networking and filesystems, without needing to restart the whole system. But considering that Linux kernel nowadays (was it always the case?) offers the option to use modules to achieve the same effect, what are the (remaining) advantages of a microkernel? What does `exec {STDIN}>&0` do? In JavaScript:  encodeURIComponent("©√") == "%C2%A9%E2%88%9A"   Is there an equivalent for C# applications? For escaping HTML characters I used:  txtOut.Text = Regex.Replace(txtIn.Text, @"[\u0080-\uFFFF]",     m =&gt; @"&amp;#" + ((int)m.Value[0]).ToString() + ";");   But I'm not sure how to convert the match to the correct hexadecimal format that JS uses. For example this code:  txtOut.Text = Regex.Replace(txtIn.Text, @"[\u0080-\uFFFF]",     m =&gt; @"%" + String.Format("{0:x}", ((int)m.Value[0])));   Returns "%a9%221a" for "©√" instead of "%C2%A9%E2%88%9A". It looks like I need to split the string up into bytes or something.  Edit: This is for a windows app, the only items available in System.Web are: AspNetHostingPermission, AspNetHostingPermissionAttribute, and AspNetHostingPermissionLevel. I was surprised to find that standalone package can not compile a document with an equation:  \documentclass{standalone} \begin{document} \begin{equation} % not working! F(V, T) = E(V) + D(T) \end{equation} \end{document}   Is there an option or some workaround that allows this? The current error is something like:   ! Missing $ inserted.   in line 4. (The idea of course is that the including (main) document can just \input the standalone without knowing if is going to be an equation or something else) How to Make A button do more than one action xcode