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How can I improve Light Armor as an Archer? I play as an archer, which means sneaking and killing foes off at long range. Problem is, once a creature gets too close to me, I am in a world of troubles. (A random dragon encounter is fair game if I can snipe it off, but a random bear encounter is the thing I fear mostly. Three strikes of such a vicious beast and I drop dead.)  At short range, I use a one-hand sword with shield, but I do not want to put much perks into those skills, as I want to be a sneaky archer first.  Which leaves Light Armor. But to get certain perks I need some skill points, e.g., 30 points are required for the "Custom Fit"- and 40 for "Agile Defender 2/5"-perk. Yet I have no clue how to accumulate those points.  Many enemies won't even see me, so I seldom will be hit. Getting hits means getting skills point. Letting some enemies come close to me and let me hit me on purpose sometimes helps, but since I cannot stand much damage I mostly die erasing any hard earned process.  So is there a teacher for Light Armor like there is for other skills? And if not, how should I go on to improve the Light Armor skill? What font is "z" in "z-score"? Run Ubuntu ISO live image from Windows BIOS - no USB or DVD Let $R$ a ring, and let $$\displaystyle R[[x]]=\left\{\sum_{k=0}^{\infty}a_k x^k\;\middle\vert\; a_k\in R\right\}$$ with addition and multiplication as defined for polynomials.  We have that $R[[x]]$ is a ring containing $R[x]$ as a subring.  How to prove that if $a_0\in R$ is a unit, then  $\displaystyle\sum_{k=0}^{\infty}a_k x^k$ is a unit in $R[[x]]$? Suppose I have a complex figure made ​​with TikZ. How do I use it several times without having to repeat all the commands?  \documentclass{article} \usepackage[utf8]{inputenc} \usepackage{tikz}  \begin{document}  Base figure  \begin{tikzpicture}   \draw[blue] circle (2);   \foreach \i in {0,10,...,350}     \draw[blue] (\i:1.9) -- (\i:2.1); \end{tikzpicture}  Using base figure.  \begin{tikzpicture}   \draw[blue] circle (2);   \foreach \i in {0,10,...,350}     \draw[blue] (\i:1.9) -- (\i:2.1);   \foreach \i in {0,10,...,350}     \node at (\i:2.7) {\tiny $\i^\circ$}; \end{tikzpicture}  Using base figure.  \begin{tikzpicture}   \draw[blue] circle (2);   \foreach \i in {0,10,...,350}     \draw[blue] (\i:1.9) -- (\i:2.1);   \foreach \i in {0,10,...,350}     \draw (0,0) -- (\i:2); \end{tikzpicture}  \end{document} When can I use a forward declaration? I am looking for the definition of when I am allowed to do forward declaration of a class in another class's header file:  Am I allowed to do it for a base class, for a class held as a member, for a class passed to member function by reference, etc. ? What is the most practical way to implement camera/viewport to a 2D-game?  I've read, that I should store the object world position instead of position relative to the screen?  Current situation:  I have implemented a simple 2D-game where I load objects and levels from XML-files. Currently the level XML-file looks like this:  &lt;map&gt;    &lt;tile obj="ground" x="0" y="555" /&gt;    &lt;tile obj="ground" x="16" y="555" /&gt;    &lt;tile obj="ground" x="32" y="555" /&gt;    ... &lt;/map&gt;   All objects have a 2d-vector "position" storing their current location on the screen.  What I want it to be:    In the picture:   Camera is either 800x600 or 640x480 Blocks and sprites are 16x16 pixels. World size may vary The coordinates probably should be normalized relative to the world, not to the screen? Viewport position relative to player's x, y and moves when the player reaches camera dead zone (similar to ).   I'm asking pseudo examples / articles, but if you need to know what I'm using for the development: SDL &amp; C/C++. We have more than one content management system (eCommerce) running on our site and we want to know would it be wise to separate these systems and run on their own server for better performance, easier to manage and better for security, but our concern is the SEO impact.  Is it better to run site.com/this-is-our-other-platform/ or this-is-our-other-platform.site.com? jQuery serialize does not register checkboxes Using PyQGIS to transform layer of polygons into layer of holes inside bbox? I'm using python in QGIS. I have a layer of polygons (its a result of some earlier dissolving and has no overlapping polygons but some holes and islands in holes etc). I want to build a new layer which contains one polygon representing a bbox of the first layer with each polygon cut from it.  Essentially I want to "invert" the layer I have so that where the was polygon, now there is not, and where there was not polygon now there is. All inside a bounding box of the original layer.  I can build a bbox easily and I tried to "subtract" the polygon layer from my new bbox polygon layer but the process slows to a stop and then crashes my PC. Here's the algorythm  processing.runalg("qgis.difference","path/to/polygon.shp","path/to/bbox.shp","path/to/result.shp")   I dont care about attributes (obviously). I just need to cut one set of polygons from one larger polygon.  It seems so simple, I wish I could find a simple command or script to acheive this. As stated at the top I'm looking for a solution in python in QGIS. Since I am a regular Stack Overflow follower, I came across this and was shocked a bit regarding the design and user experience perspective.  Attaching picture 1 - it states that I can click any site and view a synopsis about it. Clear!!!    Attaching Picture 2 - you can see that when I clicked Webmasters, the design wants me to scroll horizontally to view all information and basically it hides information.    It would be nice, if it did something like below : Proving the so-called "Well Ordering Principle" Can I have two UK visas simultaneously? I have a visitor UK visa valid until October 2017.  I also want to apply for a Tier 4 student visa. My studies in the UK start in September 2017.  If I apply for the student visa in June, will they simply issue an overlapping student visa, or will they cancel my visitor visa and I will not be able to come to the UK until September?  I am worried because in a similar situation with Schengen visas, my existing visa was canceled. Groups in derived series are normal in the whole group I am considering a finitely generated, solvable group $G$ which has subexponential growth. Let $G=G_0\vartriangleright G_1\vartriangleright....\vartriangleright G_d\vartriangleright G_{d+1}=1$ denote the derived series of G.  It should be the case that $G_d$ is normal in $G$. Does anyone know why this is true? I don't know whether all of the assumptions above are necessary for the result. I'm very new to Blender and I'm trying to make a water vortex like this.(may be not the easyest first project for a newbie)     I watched several tutorial on liquids particle etc but I'm not sure what is the best aproach. What I tried  until now:   I made a particle system with a vortex force field. It looks good, but I'm not able to add the right material.      I played around with the fluid physics, the water looks good but if I add a vortex force field it does nothing.   I would be very grateful if somebody could point me in the right direction because I'm definitely stocked. I am trying to remove the Facebook and Messenger apps from my Asus Zenphone Laser 2.  Unfortunately, in both cases, I seem to be unable to find the option to fully delete them from the device. I have disabled them, but the app management screen now shows the following:     How can I fully delete/uninstall them? How do I calculate a time delta in my Google Spreadsheets? What are the use cases for different scoping constructs? By default after a new user signs up, a redirect to the home page happens.  But in such case I want to redirect such user to another page like node/35.  In this node/35 I then want to display some content. Why can't I connect to Pokemon Go via mobile data?