Which header do you set to prevent Outlook from forwarding an email (literally)?
How to prevent an email from accidentally being forwarded?
Why is this true: The only orthogonal projection that is also unitary from $\Bbb C^n$ to $\Bbb C^n$ is the identity Can anyone explain me please how to see this statement: the only orthogonal projection that is also unitary from $\Bbb C^n$ to $\Bbb C^n$ is the Identity.  how can I prove formally that? or how can I see that only the Identity satisfy it? How do you turn off developer mode on an s5? I turned developer options 'off', but is there anything else that needs to be done? Not my phone so don't want to mess anything up :-) A high-reputation, highly-active user has already been dinged once for a sockpuppet, and I just dinged him again. He probably has another sockpuppet as well.   What are the guidelines for handling users who game the system in this fashion? Specifically,   How can I be sure I'm looking at a sockpuppet? When should sockpuppets be considered a problem? How should moderators handle problematic sockpuppets once they've been identified? I was suspended for sockpuppetting and feel this is unfair I just saw Get Out, and there's one thing I don't understand.  Georgina turns out to be controlled by Rose's grandmother; its grandmothers brain in her body. Why then, is Georgina constantly cleaning and being treated like an actual maid.  During the diner scene, we get a glimpse into the kitchen, and we see Georgina holding up a plate in way that suggested that she was made to work and cook. The pose and the fact that she was already standing there holding the plate before Missy enters the kitchen was also quite strange and suggestive.  Also, at the "party" theres a moment that Chris sees Georgina and Missy. For a moment he thinks that Georgina is being involved in the party, but than it turns out the Georgina is just handed empty glasses to take care of.  So this I don't get. If its really grandma inside Georgina, then why is she treated in this way? When I create a form using the form API, the resulting html includes all sorts of unwanted divs. For example, if I use:  $form = array(     'myFieldset' =&gt; array(         '#type' =&gt; 'fieldset'     ) );   The resulting html looks like this:   &lt;form action="/drupal-7.15/?q=chercheur" method="post" id="form-chercheur" accept-charset="UTF-8"&gt;     &lt;div&gt;         &lt;fieldset class="form-wrapper" id="edit-myfieldset"&gt;             &lt;div class="fieldset-wrapper"&gt;             &lt;/div&gt;         &lt;/fieldset&gt;         &lt;input type="hidden" name="form_build_id" value="form-87Dv5ezVpaLI5mD345ofMkLgPhsv_dawudUp73ePQTc" /&gt;         &lt;input type="hidden" name="form_token" value="sXXINWr7rmParm0tRJoEb6QKGIH_QH-ffRSOtnvxYY0" /&gt;         &lt;input type="hidden" name="form_id" value="form_Chercheur" /&gt;     &lt;/div&gt; &lt;/form&gt;   As you can see, two extraneous divs are added here. They are making the javascript I'm writing uselessly complicated, so I was wondering if there was a way to remove the extraneous divs. Ideally, I would like to obtain something like this:  &lt;form action="/drupal-7.15/?q=chercheur" method="post" id="form-chercheur" accept-charset="UTF-8"&gt;     &lt;fieldset class="form-wrapper" id="edit-myfieldset"&gt;     &lt;/fieldset&gt;     &lt;input type="hidden" name="form_build_id" value="form-87Dv5ezVpaLI5mD345ofMkLgPhsv_dawudUp73ePQTc" /&gt;     &lt;input type="hidden" name="form_token" value="sXXINWr7rmParm0tRJoEb6QKGIH_QH-ffRSOtnvxYY0" /&gt;     &lt;input type="hidden" name="form_id" value="form_Chercheur" /&gt; &lt;/form&gt;   Is this possible? I would like to visit Iran as a tourist but I'd also like to visit the USA some time after. I know the relations between the two countries are bad.   Is it likely that I'm not allowed to enter the USA after having been to Iran?   If it matters, I've never been to either of those countries. I'm a Swiss citizen, an atheist from a Christian background. Given:  DateTime.UtcNow   How do I get a string which represents the same value in an -compliant format?  Note that ISO 8601 defines a number of similar formats. The specific format I am looking for is:  yyyy-MM-ddTHH:mm:ssZ Journal of Finance Template German '*.bst' What is the difference between \par, \newline, \\ and blank lines? When should I use which one? SQL Server 2000 on Windows 10 I need to install SQL Server MSDE 2000 SP4 on Windows 10.  I have other machines that run Windows 7 and 8.1 and SQL Server MSDE 2000 works fine (with merge replication configured too).  Now I testing the same scenario with Windows 10, but setup is closing unexpectedly during installation.  I know that this version is very old, but is there a workaround to install it on Windows 10? 'Search on Yammer' link in search center refiners I have a heavily branded site I'm working on and can't find where the "Search on Yammer" link is being populated from. It appears within the search refiner/filter web part in the left column but none of the display templates reference this.   I'd like to be able to customize the link, placement on the page, etc. without resorting to jQuery to move elements around the page.     And the markup coming through looks like this. The refiners themselves come through a series of display templates but the Yammer link is nowhere that I can see in any of them.   &lt;div webpartid="f09e98eb-6dc3-4a9b-8dbf-65d0fbc7b7c3" haspers="false" id="WebPartWPQ4" width="100%" class="ms-WPBody " allowdelete="false" style=""&gt;     &lt;div class="ms-ref-ctrl"&gt;         &lt;div class="ms-ref-refiner"&gt;             &lt;div id="Container"&gt;                 &lt;h2 class="ms-displayInline"&gt;                     &lt;a class="ms-ref-name ms-displayInlineBlock ms-srchnav-link-selected ms-link" href="javascript:void(window.open(                     'https://www.yammer.com/search?trk_event=o365_search&amp;amp;search='+                     encodeURIComponent(Srch.ScriptApplicationManager.get_current().queryGroups.                     Default.dataProvider.get_currentQueryState().k),'_blank'));" title="Open a new tab to search for this on Yammer"&gt;Search on Yammer&lt;/a&gt;                 &lt;/h2&gt;             &lt;/div&gt;         &lt;/div&gt;     &lt;/div&gt; &lt;/div&gt; &lt;div componentid="ctl00_SPWebPartManager1_g_f09e98eb_6dc3_4a9b_8dbf_65d0fbc7b7c3_csr" id="ctl00_SPWebPartManager1_g_f09e98eb_6dc3_4a9b_8dbf_65d0fbc7b7c3_csr"&gt;             ... refiners populated through display templates ... &lt;/div&gt; Please add a system to allow file uploads attached to questions and answers In Star Trek (2009), Did the Original Timeline Survive? "Has/Have/Had" as a main verb and auxiliary verb I need help regarding the use of has/have/had both as a main verb and as an auxiliary verb.  In the sentence below, the word has acts as the main verb. I would normally follow it with the phrase "so do I."        Kenny has a car, and so do I.      On the other hand, the word has in the following sentence acts as an auxiliary verb. I would normally follow it with the phrase "so have I."        Kenny has bought a car, and so have I.      a) Are sentences 1 &amp; 2 above correct? I'm under the impression that so do I is used when has/have/had is the main verb of a sentence, and so have/had I if it's an auxiliary verb in a sentence.  b) Does the verb has/have always need a supporting "auxiliary verb" (either implied or mentioned)? (e.g., Kenny has a car = Kenny does have a car.) Why can't Python's raw string literals end with a single backslash? Technically, any odd number of backslashes, as described in .  &gt;&gt;&gt; r'\'   File "&lt;stdin&gt;", line 1     r'\'        ^ SyntaxError: EOL while scanning string literal &gt;&gt;&gt; r'\\' '\\\\' &gt;&gt;&gt; r'\\\'   File "&lt;stdin&gt;", line 1     r'\\\'          ^ SyntaxError: EOL while scanning string literal   It seems like the parser could just treat backslashes in raw strings as regular characters (isn't that what raw strings are all about?), but I'm probably missing something obvious. How do I convert two lists into a dictionary? Imagine that you have the following list. keys = ['name', 'age', 'food'] values = ['Monty', 42, 'spam']  What is the simplest way to produce the following dictionary? a_dict = {'name': 'Monty', 'age': 42, 'food': 'spam'} In a multiple regression, the regression coefficient of the two subsamples is opposite to that of the full sample. Both coefficients are significant. The sum of the number of obs in the two subsamples is equal to that of the full sample. Is this normal? What are the possible causes? Thanks. What is approximate error of Pythagorean Theorem vs. Haversine Formula in measuring distances on sphere at various scales? Many people when first trying to calculate distances between two longitude / latitude pairs  ask if Pythagorean theorem works as an appropriate distance function.  Most often people answer "no, the Pythagorean theorem only works on a 2D Euclidean plane." Rarely, however, do people mention the effect of scale and location on the sphere on how inaccurate the Pythagorean theorem is.  The basic idea being at very small scales, the surface of a sphere looks very much like a plane. At very large scales, it distances along the surface are more curved and therefore the difference between the incorrect Pythagorean Theorem and the correct Haversine Formula is greater.  Does anyone know a formula or rule of thumb that tells you the difference between the two distance measures based on the scale of the distance you are trying to measure?   I think having this explicitly would help in:   explaining why the Pythagorean Theorem isn't perfect; and in letting people who are looking for more "rough" distances know when Pythagoras actually will serve their purposes. This is an exercise from Chapter 3 of Golan's linear algebra book.  Problem: Show $\mathbb{Z}$ is not a vector space over a field.  Solution attempt:  Suppose there is a such a field and proceed by contradiction. I will write multiplication $FV$, where $F$ is in the field and $V$ is an element of $\mathbb{Z}$.   First we rule out the case where the field has characteristic 2. We would have   $$0=(1_F+1_F)1=1_F1+1_F1=2$$  a contradiction.  Now, consider the case where the field does not have characteristic 2. Then there is an element $2^{-1}_F$ in the field, and   $1=2_F(2^{-1}_F1)=2^{-1}_F1+2^{-1}_F1$  Now $2^{-1}_F1\in\mathbb{Z}$ as it is an element of the vector space, but there is no element $a\in\mathbb{Z}$ with $2a=1$, so we have a contradiction.  Is this correct? Short story (+radio play?) in which astronauts outside their ship slowly drift apart in space Looking for a short story in which the crew of a spaceship for some reason find themselves outside the ship, drifting apart in outer space. They can communicate via their radios but are individually drifting apart.  One by one, they lose communication as they drift further away from each other.  Might have also been adapted into a radio play?