shred command all disks
shred multiple hard drives
Inner Product Spaces I am trying to reconcile the definition of Inner Product Spaces that I encountered in Mathematics with the one I recently came across in Physics.  In particular, if $(,)$ denotes an inner product in the vector space $V$ over $F$:    $(u + v, w) = (u, w) + (v, w) \text{ for all } u, v, w \in V$, $(\alpha v, w) = \alpha(v, w) \text{ for all } v, w \in V$ and $\alpha \in F$, $(v, w) = (w, v)^* \text{ for all } v, w \in V$, (* denotes complex conjugation)   were some of the properties listed in my mathematics course.    In physics, however, the inner product was said to be linear in the second argument and $(v,\sum(\lambda_i w_i)) = \sum(\lambda_i (v,w_i))$ where $v$ and $w_i$ are kets in Hilbert space and $\lambda_i$ are complex numbers.    To me, these properties of an Inner Product are not compatible.  If the first definition of inner product is correct, then I think $(v,\sum(\lambda_i w_i)) = \sum((\lambda_i)^* (v,w_i))$ where $^*$ denotes complex conjugation. Frequently loaded packages: Differences between pdfLaTeX and XeLaTeX Until now, I have been compiling my LaTeX documents with pdfLaTeX. My standard document preamble includes the "usual suspects" for non-English speakers (, , ) and a bunch of other packages. Assuming I were to convert to XeLaTeX, what modifications of my preamble are advisable? I'm aware that the expansion=true option of the  package is not (yet) available for XeLaTeX, and that  is sort of a default package for OpenType fonts. What other packages (and package options) should be removed and, vice versa, incorporated when switching from pdfLaTeX to XeLaTeX? Translation of these Cirth runes What is the translation of what's written below?  I think it may be the poem of the One Ring, but I'm not sure. Changing affiliation on publication How do I add SSL to a .net application that uses httplistener - it will *not* be running on IIS Most recent edits in bold I am using the .net HttpListener class, but I won't be running this application on IIS and am not using ASP.net.  This  describes what code to actually use to implement SSL with asp.net and  describes how to set up the certificates (although I'm not sure if it works only for IIS or not).    The class documentation describes various types of authentication (basic, digest, Windows, etc.) --- none of them refer to SSL.  It does say that if .  Is this going to be a one line property setting and HttpListener figures out the rest?    In short, I need to know how to set up the certificates and how to modify the code to implement SSL.  Although it doesn't occur when I'm trying to access HTTPS, I did notice an error in my System Event log - the source is "Schannel" and the content of the message is:     A fatal error occurred when attempting   to access the SSL server credential   private key. The error code returned   from the cryptographic module is   0x80090016.   Edit: Steps taken so far   Created a working HTTPListener in C# that works for HTTP connections (e.g. "" Created a certificate using makecert.exe Added the certificate to be trusted using certmgr.exe Used Httpcfg.exe to listen for SSL connections on a test port (e.g. 8090) Added port 8080 to the HTTPListener via listener.Prefixes.Add("); tested an HTTP client connection, e.g. (") in a browser and receive correct return tested an HTTPS client connection, e.g. (") in a browser and receive "Data Transfer Interrupted" (in Firefox) debugging in visual studio shows that the listener callback that receives the requests never gets hit when the HTTPS connection starts - I don't see any place that I could set a breakpoint to catch anything else earlier. netstat shows that listening ports are open for both HTTPS and HTTP.  the HTTPS port does go to TIME_WAIT after a connection is attempted.  and  don't catch any of the traffic, I guess it doesn't get far enough in the process to show up in those HTTP analysis tools   Questions   What could the problem be?  Is there a piece of .Net code I am missing (meaning I have to do more in C# other than simply add a prefix to the listener that points to HTTPS, which is what i have done) Have a missed a configuration step somewhere?  What else might I do to analyze the problem? Is the error message in the System Event log a sign of the problem?  If so how would it be fixed? Escaping WP_Query tax_query when term has special character(s) Here's my issue. I have a custom post type that I'm attaching a custom taxonomy to. This taxonomy will allow the admin to provide search suggestions that will ensure the post is found when a user searches. This taxonomy is also used on the front-end to autocomplete the search field with these suggestions.  The system works fine, except when the term contains a forward slash, a space or other "special" characters.  &lt;?php $keyword = 'Ski-in%2FSki-out';//Submitted via $_GET $keyword = urldecode($keyword); // (string)'Ski-in/Ski-out'  $taxQuery = new WP_Query(array(     'post_type' =&gt; 'ml_properties',     'tax_query' =&gt; array(         'relation' =&gt; 'OR',         array(             'taxonomy' =&gt; 'mc_tax_lifestyle',             'field' =&gt; 'name',             'terms' =&gt; array($keyword),             'operator' =&gt; 'IN'         )     ) )); ?&gt;   I've looked into using the escaping features provided by WordPress, but haven't had any luck there. I thought this would be a simple problem, but either my Google-fu is not strong, or I'm just not having any luck.  I've also verified that that Ski-in/Ski-out is the exact string stored in MySQL. I've looked into using esc_attr(), $wpdb-&gt;esc_like() and esc_sql() but none have an effect.  Perhaps I'm missing something obvious? I've read many years ago in books, that the brain has no nerves on it, and if someone was touching your brain, you couldn't feel a thing.  Just two days before now, I had a very bad migraine, due to a cold. It's become better now, but when I had it I felt my head was going to literally split in half, as the pain was literally coming from my brain.  So it lead me to the question: How come people can get headaches if the brain has no nerves? Can $(X_1,X_2) \cap (X_3,X_4)$ be generated with two elements from $k[X_1,X_2,X_3,X_4]$? Can $(X_1,X_2) \cap (X_3,X_4)$ be generated with two elements in the ring $R=k[X_1,X_2,X_3,X_4]$? Can it be generated with three elements? (Here $k$ is a field.)    Thanks for any help. From axiom of regularity, how can I prove $x \notin y \lor y \notin x$ What method in the String class returns only the first N characters? A story about a whole crew of aliens who visit Earth, befriend a child It was a book I read when I was a kid, so I am assuming it was a book aimed at kids/young adults. A whole crew of aliens of different species meet an Earth kid. He befriends them. One of the aliens comes from a planet with dozens/hundreds of different sexes/genders. At one point, the Earth kid is talking about a swamp:  Alien: &quot;I live in/near a swamp on my home planet&quot; Kid: &quot;Oh, do you come from a swamp planet?&quot;  The alien points out that just because there is a swamp on his planet doesn't make it a swamp planet, there are dozens of biomes on his planet, just like Earth. Earth isn't just a swamp planet. Positivity of a determinant Lightning-Web-Components Select Option prepopulate value Let's say I have a Lightning-Web-Component with a select list with dynamic options where the value is a user Id and the label is the user's name:  &lt;select class="slds-select" onchange={handleSelectChange} disabled={isDisabled}                           data-value={step.selectedUser} &gt;                                 &lt;option value=""&gt;--None--&lt;/option&gt;                                 &lt;template for:each={step.approvalTemplateStep.Approval_Step_Users__r} for:item="user"&gt;                                     &lt;option key={user.key} value={user.User__c}&gt;                                         {user.User__r.Name}&lt;/option&gt;                                 &lt;/template&gt;                             &lt;/select&gt;    How do I prepopulate the select option with a value? I have the value I want to be prepopulated in the variable called step.selectedUser.  Here's what I see on page load:   Here's what I should see: Can I get SSH to use an askpass program even if it was run from a terminal? says:  SSH_ASKPASS    If  ssh needs a passphrase, it will read the passphrase from the    current terminal if it was run from a terminal.  If ssh does not    have  a  terminal associated with it but DISPLAY and SSH_ASKPASS    are set, it will execute the program  specified  by  SSH_ASKPASS    and open an X11 window to read the passphrase.   I'd like SSH to use an askpass program even if it was run from a terminal.  On occasion, I have to connect to servers, where there's some delay in showing a password prompt (maybe due to network issues, maybe due to attempted reverse DNS lookups, …). I get annoyed and switch to something else, and forget about the attempted connection. (Insert joke about attention span of a goldfish.) When I finally get back to it, the prompt's timed out and even a correct password would just result in a closed connection.  Keys would be one solution, but not every system I use has my usual SSH keys. However, I usually use Ubuntu systems, and Ubuntu has an SSH askpass program installed by default.  If an askpass window popped up, however, I'd be immediately aware of it. That's a good enough compromise for me, if only I can get it to work. Map matching links and ideas? I'm using OpenStreetMap and its vectorial road network and I'd like to implement a map matcher algorithm.   Currently I'm able, for each GPS position, to retrieve the nearest road segment and calculate the projection of this position to that segment, like on this image (Red pin is the pure GPS position, in blue the mapped segment and in Green the mapped position):    However, due to the lack of accuracy of the GPS, sometimes the mapped position jumps from segment to another and can provide some inconsistent mapped position from time to time.  My current algorithm is very basic : from the pure GPS position, I get the nearest segment and decide that the mapped matched position is on this one. I know that this can be really improved.  I can imagine that taking the vehicle direction into account will improve the map matching but do you know any other approach that would enable me to improve my map matcher ?  I seek any link, and/or open source software? I'm having trouble with a question from an introductory Linear Algebra book. It goes: "Show that the Only Subspaces of $R^2$ are the zero subspace, $R^2$ itself, and the lines through the origin." I'm thinking the easiest way to do this is to show that if $W$ is a subspace of $R^2$ containing $2$ different lines through the origin then $W$ is all of $R^2$. Is this a good way to go about it? and how could I show this? How do you select a particular option in a SELECT element in jQuery? Word style "keep with next" except on last item How to list all files ordered by size I would like to list all files in the order of big to small in size and the files could be present anywhere in a certain folder. How to convert HTML to XHTML? I need to convert HTML documents into valid XML, preferably XHTML. What's the best way to do this? Does anybody know a toolkit/library/sample/...whatever that helps me to get that task done?  To be a bit more clear here, my application has to do the conversion automatically at runtime. I don't look for a tool that helps me to move some pages to XHTML manually.