After reinstalling 15.1 I have a lot of problems with my permissions. I constantly have to adjust them manually. That means I'm doing it wrong.   Here is what I do:   I create a folder. The permissions are: Owner: Me, Group: Jos (I'm the only user). Both have create and delete files. With those settings Joomla doesn't remove the installation folder.  After manually removing it I get the error message:   No configuration file found and no installation code available. Exiting...   Now I use the command:  sudo chown -R www-data:jos /var/www/html/my_site   Owner is now www-data (create and delete) Group is jos (create and delete). Installation works fine. Site works. But I can't do anything in it, as I am not the owner. www-data is, and I have only Access Files permission.  I am using Lamp.  How do I set it correctly?
I want to stop having to use sudo everytime I work in /var/www. How can I do that? I simply want to put all of my sites into this directory and work with them without too much pain.
To be clear on this, I know what is the definition of an inner product space and some properties and theorems about them. What I am asking for is an intuition for this definition in the complex case. In the real case, the intuition (or at least one of them) is  geometric: The inner product of two vectors is the length of the projection of the first to the second scaled by the norms of both vectors so that it is symmetric (modulo some details). In particular I (and everybody else) think of "inner product zero" as geometric orthogonality and of orthonormal bases as, well, orthonormal bases and so on. The question is, what should I think about when working with complex (or should I say hermitian?) inner product spaces? what is the "meaning" of the complex number associated to two vectors called their inner product?  I will be happy to hear all kinds of answers. For example, what physical phenomena does it model or in what mathematical situations does in "naturally" appear. Answers that stress the "nice structure" resulting are also welcome, yet I feel that by itself  it is a bit unsatisfying. Is this defined by the language? Is there a defined maximum? Is it different in different browsers? Stacks for Unity Launcher I'm looking forward to emulate the behavior of OS X Dock Stacks so that I can have, for instance, one stack for browsers and another one for IDES. People at ask ubuntu are doing a lot of cleaver stuff with custom Launchers and Quicklists (see ). So has anyone figured out how to have stacks in Unity? Anything fancier than a static Quicklist over a dummy folder icon? states that if $f:X \rightarrow Y$ is a morphism of ringed space, $G$ is a locally free $O_Y$-module, then $f^*G$ is a locally free $O_X$ module.     Suppose that $G$ is a locally free $O_Y$ module, hence it is a free $O_Y|_U=O_U$ module. We have an induced map  $$f^{-1}(U) \rightarrow U$$ given by restriction of morphism of ringed spaces.   Hence, as $\bigoplus O_U \simeq G|_U$, $f^*:Mod(O_U) \rightarrow Mod(O_{f^{-1}(U)})$ is functorial, $f^*(G|_U) = (f^*G)|_{f^{-1}(U)}$, we have isomoprhism,  $$ \bigoplus O_{f^{-1}(U)} \simeq (f^*G)|_{f^{-1}(U)} $$ Looking for a simple proof that groups of order $2p$ are up to isomorphism $\mathbb{Z}_{2p}$ and $D_{p}$ . I'm looking for a simple proof that up to isomorphism every group of order 2p (p prime) is either $\mathbb{Z}_{2p}$ or $D_{p}$ (The Dihedral group of order 2p).  I should note that by simple I mean short and elegant and not necessarily elementary. So feel free to use tools like Sylow Theorems, Cauchy Theorem and similar stuff.  Thanks a lot! Show that there exists a unique $v_0 \in H^1(0,1)$ such that $u(0)=\int_0^1(u'v_0'+uv_0), \forall u \in H^1(0,1)$ Evaluating $\int \frac{1}{{x^4+1}} dx$ I am trying to evaluate the integral  $$\int \frac{1}{1+x^4} \mathrm dx.$$  The integrand $\frac{1}{1+x^4}$ is a rational function (quotient of two polynomials), so I could solve the integral if I can find the partial fraction of $\frac{1}{1+x^4}$. But I failed to factorize $1+x^4$.   Any other methods are also wellcome. General formula for evaluating integrals of the form $\displaystyle\int_0^\infty x^ae^{-bx}dx$ Find a general formula for evaluating integrals of the form $\displaystyle\int_0^\infty x^a e^{-bx}dx.$   I've been pondering about this question for some time. Obviously integration by parts is way too inefficient. I know there's recursion involved and maybe there's a way to find a general formula through intuition. Recently the keyboard and trackpad on my 2015 13" MacBook Pro have stopped working. This is the second laptop to do this, the same issue happened about 6 months ago and Apple gave me a new one when they could not figure it out.  The issue usually starts with force touch not working then progresses to the keyboard and trackpad not being recognized at all. Currently the power button works and force touch works but all other keys and the trackpad don't work.  When this happens there are a lot of errors in the console regarding the AppleHSSPIController.  4/21/16 6:56:47.000 AM  kernel[0]   Error: AppleHSSPIDevice::start failed to get device descriptor 4/21/16 6:56:47.000 AM  kernel[0]   Error: AppleHSSPIController::_enumerateDevice Start failed 4/21/16 6:56:47.000 AM  kernel[0]   Error: AppleHSSPIController::_handleEnumerationFailureGated Giving up on device   You can see the full log here: Government investigating home library of missing inventor This is a short story from the 50s or 60s.  A scientist or inventor has invented either teleportation or a space drive and has disappeared - leaving no documentation or clues except his extensive home library.  The government gathers all types of scientists to attempt to duplicate his research.  Several months later, as they are about to launch the first space drive space ship, the officer in charge reveals that there was no 'disappeared inventor'.  The greatest step toward a new impossible concept is knowing that it has already been done. Pass C# ASP.NET array to Javascript array What's the origin of "I'm down with it"? I understand it's an expression of agreement. What exactly does it mean and where did it originate from? How can I fix a geoTiff with an incorrect CRS? Trying to load and plot a raster (it's a DEM) in R, but having problems.    Using R I read in a raster file:  library(raster)  dem &lt;- raster("DEM_Victoria.tif")  # &gt;70 MB print(dem)  class       : RasterLayer  band        : 1  (of  3  bands) dimensions  : 5444, 6007, 32702108  (nrow, ncol, ncell) resolution  : 100, 100  (x, y) extent      : 176615.6, 777315.6, 5650397, 6194797  (xmin, xmax, ymin, ymax) coord. ref. : +proj=longlat +ellps=WGS84 +no_defs  data source : DEM_Victoria.tif names       : DEM_Victoria values      : 0, 255  (min, max)   My confusion here is the extent vs the CRS. The extent shows coordinates from a UTM Zone 55S system, while the CRS reports it as longlat.   Similarly, gdalinfo reports:  Driver: GTiff/GeoTIFF Files:  DEM_Victoria.tif Size is 6007, 5444 Coordinate System is: GEOGCS["GDA94",     DATUM["unknown",         SPHEROID["unretrievable - using WGS84",6378137,298.257223563]],     PRIMEM["Greenwich",0],     UNIT["degree",0.0174532925199433]] Origin = (176615.587999997427687,6194797.138000000268221) Pixel Size = (100.000000000000000,-100.000000000000000) Metadata:   AREA_OR_POINT=Area Image Structure Metadata:   COMPRESSION=LZW   INTERLEAVE=BAND Corner Coordinates: Upper Left  (  176615.588, 6194797.138) (Invalid angle,Invalid angle) Lower Left  (  176615.588, 5650397.138) (Invalid angle,Invalid angle) Upper Right (  777315.588, 6194797.138) (Invalid angle,Invalid angle) Lower Right (  777315.588, 5650397.138) (Invalid angle,Invalid angle) Center      (  476965.588, 5922597.138) (Invalid angle,Invalid angle) Band 1 Block=6007x1 Type=Byte, ColorInterp=Red Band 2 Block=6007x1 Type=Byte, ColorInterp=Green Band 3 Block=6007x1 Type=Byte, ColorInterp=Blue   Is this real? A problem? (well it is to me, but perhaps because I don't understand something) Fixable?  I tried 'Assign projection' in QGIS, which uses this command:  gdalwarp -t_srs EPSG:28355 -srcnodata -32768  DEM_Victoria.tif DEM_Victoria.tif.tmp   but it failed with:     ERROR 1: Too many points (12100 out of 12100) failed to transform,   unable to compute output bounds. If $f$ is an entire function where every power series expansion has at least one 0 term, show it is a polynomial Suppose $f$ is entire and that in every power series $f(z)=\sum_{n=0}^\infty c_n(z-a)^n$ at least one coefficient is $0$. Prove that $f$ is a polynomial. Problem numbering environment $X$ is a topological space with no special properties.  If a space $X$ has no isolated points, then show the same for any dense subset of   $X$.  Thanks a lot. I have created a VF page and used "render as pdf"  &lt;apex:commandButton value="Save to Opportunity" action="{!savePdf}"  /&gt;   Its working fine when i am using above line without rerender and oncomplete but when i am adding rerender or oncomplete it is not working.I am able to save the PDF in attachment folder but when i am trying to open its showing  "Unable to load document"  Even if i remove oncomplete and use Rerender then also its saving the attachment in Attachment object and when i view ,it is not loading and says "Unable to load document"      &lt;apex:commandButton value="Save to Opportunity" action="{!savePdf}"  oncomplete="myClose();"/&gt;   Javascript Code  function myClose(){      self.close();     window.opener.location.href="/{!$CurrentPage.parameters.Id}";  }   Class Code  public void savePdf() {      PageReference pdf = Page.GenerateQuotePDF;     pdf.getParameters().put('id',parentId);      Attachment attach = new Attachment();      Blob body;     body = pdf.getContent();     attach.Body = body;     attach.Name = 'Opportunity'+ '.pdf';       attach.IsPrivate = false;     attach.ParentId = parentId;     attach.ContentType = 'application/pdf';     insert attach;     }     Please help.. Assume   $$\lim_{n\to \infty}{x_ny_n}=0$$  then  $$\lim_{n\to \infty}{x_n}=0$$ or $$\lim_{n\to \infty}{y_n}=0$$  I couldnt find two series who disprove that.. just hint please thanks If you have a single atom in a box, what state of matter would it be in? If the walls of the box were made of a completely inert material, what state of matter would the atom be in? Or would it not have one? I realized this is a duplicate of several other questions. I would like to install the restricted extras package, which I didn't select during the install. How can I do that?        is a meta-package that installs:         Support for MP3 and unencrypted DVD playback   Microsoft TrueType core fonts   Flash plugin   codecs for common audio and video files