What are some books that teach to apply Lagrangian methods on simple systems of Physics I?
Book about classical mechanics
Do I say "I study computer science," or "I study Computer Science"? Similarly, "I really liked that computer science course," vs. "I really liked that Computer Science course." Dissolve (merge) polygons QGIS based on attribute values only when are adjacent Changing top, bottom, left & right margins on the fly I’m trying to find a way of being able to modify all of the margins of a page whenever I want to and as many times as I want to on a single page in order to be able to put text very easily where I want on a page.   I have thought of using the geometry package and using   \newgeometry{left=6.75cm, right=1cm, top=1cm, bottom=1cm}  %…  \restoregeometry   but unfortunately this only works for whole pages, so I can only change the margins once per page (and then they are valid for the whole page without having the possibility of changing them again).   I found the following script on the internet which enables users to change margins on the fly, just as I want to. The code below works fine and enables me to change the left and right margins of my page as many times as I want to, but unfortunately, it doesn’t give me the option of changing the top and bottom margins.  % placed before \begin{document}  \newenvironment{changemargin}[2]{% \begin{list}{}{% \setlength{\leftmargin}{#1}% \setlength{\rightmargin}{#2}% }% \item[]} {\end{list}}  % And then inside the document, whenever I want to use % the command to change the margins on the current page  \begin{changemargin}{1.9875cm}{-3.7625cm} % this means the left margin increases by 1.9875cm compared % to the default left margin (4.7625cm) (so left margin=6.75cm here) % and the right margin decreases by 3.7625cm (so right margin=1cm)  % ... (text or pictures in new environment)  \end{changemargin}   For this reason, I tried to adapt the code above and came up with the code below:  % placed before \begin{document} \newenvironment{changemargin}[3]{% \begin{list}{}{% \setlength{\leftmargin}{#1}% \setlength{\rightmargin}{#2}% \setlength{\topmargin}{#3}% }% \item[]} {\end{list}}  % And then to use the command: \begin{changemargin}{1.9875cm}{-3.7625cm}{1cm} % ... \end{changemargin}   It compiles and still changes the left and right margins but the top margin remains unchanged. (I haven’t yet tried to change the bottom margin).  Can anyone help me get this code to work completely, and enable me to modify the left, right, top and bottom margins of a page? Thanks. How can I know if a process is running? When I get a reference to a System.Diagnostics.Process, how can I know if a process is currently running? Are there expected dressing norms at faculty interviews? Will a casual tee-jeans be discouraged?  In the same vein, what is expected when a student visits the campus for an interview? If I want to shoot darker shots, is it better to increase the lighting and then darken in post to retain clarity? I'm just getting started - in my last shoot, I was using a 6D with a 50mm/1.4.  In low light, the pictures looked fantastic on the viewfinder but on the computer screen, appeared extremely grainy.  For future shoots, if I want to achieve something like this:     Should I shoot with way more light / lower ISO to retain clarity, and then just darken in post?  What kind of setup would be needed to achieve the above?    With my setup -   Camera Canon EOS 6D  Lens EF50mm f/1.4 USM  Focal Length 50mm  Shutter Speed 1/40 s  Aperture f/1.8  ISO/Film 6400  I was getting very grainy results that I had to soften in post (in case you want to see my attempts):      Any tips would be much appreciated. How to allocate aligned memory only using the standard library? Do I need a transit visa for a layover via airports in the UAE, such as Dubai International Airport or Abu Dhabi International Airport? If so, what are the requirements for such a visa? Can I get the transit visa on arrival? Please help solve 'oracle-java7-installer' missing. Error below  dpkg: warning: files list file for package !['oracle-java7-installer' missing;][1]  assuming package has no files currently installed (Reading database ... 302933 files and directories currently installed.) Removing linux-image-extra-3.8.0-19-generic ... /var/lib/dpkg/info/linux-image-extra-3.8.0-19-generic.postrm: 6: /var/lib/dpkg/info/linux-image-extra-3.8.0-19-generic.postrm: Syntax error: ")"  unexpected dpkg: error processing linux-image-extra-3.8.0-19-generic (--remove):  subprocess installed post-removal script returned error exit status 2  Errors were encountered while processing:  linux-image-extra-3.8.0-19-generic  E: Sub-process /usr/bin/dpkg returned an error code (1) A package failed to install.  Trying to recover: How to create a Customized Ubuntu Server ISO? I'd like to create a customized Ubuntu Server 12.04 ISO but couldn't find a clear approach on how to do it. I see that Ubuntu-builder is a very good app to create a customized Ubuntu Desktop, but what about Ubuntu Server? Some Data Failed to Reconstruct, Motion Tracking I added tracks and stuff, but then when I tried to solve motion track, there was a error that said:     Some Data Failed to Reconstruct   and it also said to look into the console for details, which I did. This is what the console said:    By my understanding, my video is 372 frames long, and Blender is cutting the footage at 318 for some reason. Here is the image of the scene:    Why? Here are links to  and also . Also the next morning I did a camera solve, but then most of the frames went red. Referencing List by indexVar in lightning component I have nested list in my lightning component and now I want  to refer records of list using indexVar.  Has anyone done this before?  &lt;aura:iteration items="{!v.records}" var="row" indexVar="rowCnt"&gt;  Like `{!row[rowCnt]}?`  &lt;/aura:iteration&gt; How to show wifi password? How to render a background image in 2.8? MacOS 10.14 Mojave public beta public Wi-Fi problem I can not connect to a single public Wi-Fi hotspot that does not require a password but instead shows a pop-up window pointed to captive.apple.com  The pop-up opens blank with the error "The web page couldn't be loaded"  Any idea on how to fix this? Is it appropriate to use a question mark at the end of a compound sentence where the first independent clause is a question but the second is a statement? For example:     Do you want attribution for that quotation, because I'm definitely sharing it and want to know if I should give you credit?   or      Do you want attribution for that quotation, because I'm definitely sharing it and want to know if I should give you credit.   I suppose this could work, but it's a little niche, as the second clause might not always be appropriate for a parenthetical.     Do you want attribution for that quotation (because I'm definitely sharing it and want to know if I should give you credit)? I want to know the memory usage of my Python application and specifically want to know what code blocks/portions or objects are consuming most memory. Google search shows a commercial one is  (Windows only).  And open source ones are  and .  I haven't tried anyone, so I wanted to know which one is the best considering:   Gives most details. I have to do least or no changes to my code. pkgloader is not finding l3regex Lost/Deleted dpkg (package manager for Debian). How do I get it back? When applying dropout in artificial neural networks, one needs to compensate for the fact that at training time a portion of the neurons were deactivated. To do so, there exist two common strategies:   scaling the activation at test time inverting the dropout during the training phase   The two strategies are summarized in the  below, taken from .  Which strategy is preferable, and why?    Scaling the activation at test time:    Inverting the dropout during the training phase: