I know that there is a very similar question, but I'm not interested in highlighting. What I'm looking for is some tool in Linux to edit pdf files. I've tried pdfedit which did the work for me, but if freezes after a few edits. I've tried this tool under Ubuntu 9.10 and under KDE Fedora 14 and the same thing happens. I've tried Okular but the notations are too big to fill out exercises from pdf workbooks.    Is there any tool that suits this job? I don't care whether it is open source or I have to pay a reasonable price for it.
I typically have two needs:  Scenario A. Change a single PDF page.  In this case I have a PDF but not the original source file used to create the PDF. I don't want to try to recreate the document from scratch. I'd like to open the PDF and change a few things. A good example of this scenario: I was responsible for planning a big event at a campground site, I had a PDF of the site. I wanted to start with that document, highlight some parts, add some labels, remove some parts that weren't relevant.   or   Scenario B. Combine PDFs or extract page(s) from a PDF  This scenario usually arises because I want a single PDF deliverable that is made up of parts that are best created in different programs. In this case I have the source files for all the documents but they don't play well enough together to easily create a single PDF deliverable. For part of it, I may want to use Libre Office Writer. For another page I may want to use Gimp. Still another page I may use Libre Office Calc. I could use Writer as the master document and embed images or the Calc object into that, but for ultimate control, you can't beat separate PDF documents that are then combined.  What are the best tools / processes for editing PDFs in Ubuntu?
Consider the following snippet:  $$\text{d}_{H}(A,B)  = \max\left\{ \sup_{a\in A} \inf_{b\in B} \text{d}(a,b),\sup_{b\in B} \inf_{a\in A}\text{d}(a,b)\right\}$$     In the output, the text under the inf's is significantly smaller then the one under the sup's. The same happens when I have it in an align environment.  You can see the same problem in the wiki definition of the . How can I have the typeset under the inf's and sup's in the same size? I have a query which selects a max value over all the values of in a datetime column (dtimesent).  select dtimesent, max(ResponseTime) AS maxtime FROM allrequests  where Request like '%Requestsa%' group by dtimesent   I need to get the value of the request colmn for each max response time in each group by. Is there any easy way to do this?  There can be multiple rows per dtimesent value so I can't just include the request column in the group by,  Many thanks, Integrating $\int^{\infty}_0 e^{-x^2}\,dx$ using Feynman's parametrization trick I just failed these   in First Post, I read the question and thought it seemed reasonable but the user was deleted so to be on the safe side I clicked add comment and I failed the audit.  I'm not sure why adding a comment would be considered a negative action, is the correct option to click No Action Needed or edit?  What was I supposed to do in this situation?  Adding a comment should not be a review audit fail. I am trying to determine if the sum $\sum_{n=1}^\infty \frac{n+4^n}{n+6^n}$ is convergent or divergent.   In attempting to solve this problem I began by seeing if I could do the divergence test - in this case it is not helpful. The terms $4^n,6^n$ look like geometric series type terms but the $n$ in the numerator and denominator are troublesome. I first tried factoring $n$ out of the expression:  $$\sum_{n=1}^\infty \frac{n+4^n}{n+6^n} = \sum_{n=1}^\infty \frac{1+\frac{4^n}{n}}{1+\frac{6^n}{n}}$$  Next I tried comparing to the series $$\sum_{n=1}^\infty \frac{\frac{4^n}{n}}{\frac{6^n}{n}} = \sum_{n=1}^\infty \frac{{4^n}}{{6^n}} = \sum_{n=1}^\infty{\left(\frac{2}{3}\right)}^n$$  This is a convergent geometric series as $r = \frac{2}{3}\lt1$  now I reason that the series $\sum_{n=1}^\infty \frac{1+\frac{4^n}{n}}{1+\frac{6^n}{n}}$ is neither smaller not greater than the series $\sum_{n=1}^\infty{(\frac{2}{3})}^n$ Am I able to conclude anything in this case by a direct comparison test or can I only conclude that the first series is convergent if the second is greater than the first?  Thanks Finding the Dimension of a Matrix Polynomial: $W$ = { $p(B)$ : $p$ is a polynomial with real coefficients} Let $W = \{ p(B) : p \text{ is a polynomial with real coefficients}\}$, where $$B= \begin{pmatrix} 0 &amp; 1 &amp; 0\\  0 &amp; 0 &amp; 1\\  1 &amp; 0 &amp; 0 \end{pmatrix}$$  Which of the following possibilities presents the tightest bounds on the dimension $d$ of the vector space $W$?     $4 ≤ d ≤ 6$    $6 ≤ d ≤ 9$    $3 ≤ d ≤ 8$    $3 ≤ d ≤ 4$ Algorithm to detect intersection of two rectangles? I'm looking for an algorithm to detect if two rectangles intersect (one at an arbitrary angle, the other with only vertical/horizontal lines).  Testing if a corner of one is in the other ALMOST works.  It fails if the rectangles form a cross-like shape.  It seems like a good idea to avoid using slopes of the lines, which would require special cases for vertical lines. Currently in my last year of high school, and I have always been told that  does not exist by my physics teachers. Today my girlfriend in the year below asked me what centrifugal force was, I told her it didn't exist, and then she told me her textbook said it did, and defined it as "The apparent force experienced towards the outside of a circle is the centrifugal force and is due to the mass of the object resisting the inward centripetal acceleration that the object is experiencing". I was pretty shocked to hear this after a few years of being told that it does not exist.  I did some reading and found out all sorts of things about pseudo forces and reference frames. I was wondering if someone could please explain to me what is going on? Is it wrong to say that centrifugal force does not exist?   This has always nagged me a bit as I often wonder that if every force has a reaction force then a centripetal force must have a reaction centrifugal force, but when I asked my teachers about this they told me that centrifugal force does not exist. Nonstandard normal distribution Postfix Connection Timed out Generator of rational functions unchanged under $\sigma(X) = X + 1$ Let $L = K(X)$ be the field of rational functions over a field $K$ with characteristic $p &gt; 0$, and let $\sigma \in \operatorname{Aut}_K(L)$ with $\sigma(X) = X + 1$.   Show that $G = \left&lt;\sigma\right&gt;$ is finite, and determine a generator of $L^G = \{ f \in L: \rho(f) = f$ for all $\rho \in G \}$ over $K$.    My solution so far: $G = \left&lt;\sigma\right&gt;$ is finite because char $(K) = p &gt; 0$ and therefore $\sigma^p (X) = X + p = X $.  A rational function unchanged under $\sigma$ will also be unchanged under any $\sigma^n$, so we don't have to worry about powers of $\sigma$ I think.   Any ideas for finding a generator? Thanks. In a group $G$, if for all $a,b,c\in G$, $ab=ca\Rightarrow b=c$, then $G$ is abelian Let $G$ be a group. If for all $a,b,c\in G$, $ab=ca\Rightarrow b=c$, then phow can I prove that  $G$ is abelian? Which is correct, "neither is" or "neither are"? Can a spell be prepared once and cast multiple times? How to enlarge thickbox media library iframe? The iframe in thickbox media library is not big enough to display my custom tab. I tried to add "width=900&amp;height=600" at the end of the link that pointing to the library, but no luck. How can I modify the inframe size? I just downloaded a DVD which is for a movie. After uncompressing the DVD file I see .VOB, .IFO and .BUP files. If I open the first .VOB file it shows me the DVD menu but I can't interact with it. So, my question is... is Totem able to play those kind of files? If so, how can I achieve that? What other app could I use in order to reproduce those files?  Edit  Using VLC didn't work neither. I forgot to mention I have already tried that. Let me rephrase: if I open the first video file it shows the DVD menu, BUT I can't interact with it. Are Stack Overflow people *still* nice? The title is a reference to . We had the good fortune, to start this experiment with a really positive culture and have managed to hang onto it through vast growth and several fairly bitter internal arguments. But that does not guarantee we'll keep it forever. Lately I've had a unscientific feeling that Stack Overflow has been a bit rougher on newbie mistakes. The actual composition of this question was triggered by the comment thread on  (now with pending delete votes, so it is in danger of being 10k only). The  currently has 3 reputation points and has been a member for all of two days. The question bear the obvious (to me, at least) hallmarks of being written by a non-native English speaker with a shaky grasp of the tongue, and it is a rather simplistic question that could be answered fairly easily by Google. Question body:  Sir, I am mc student, I have knowledge in c,c++,J2EE. I want to ask you should I command in Linux with J2EE. Is it worth?  Instead of trying to improve the question, to discern exactly what the OP meant, or explaining how the question should be improved we get this comment thread instead (without wanting to call out these posters in particular, this was just the thread that got be off my duff):  2 Can you elaborate? – Dave McClelland 21 hours ago 1 Absolutely yes! If it can run on your Blu-Ray player, imagine the possibilities it can do on Linux. – The Elite Gentleman 21 hours ago 1 Basically, it's as worth as running Java on any other platform. – Alexander Gessler 21 hours ago 1 @The Elite Gentleman, You can try run it on your sim-card too) – Stas Kurilin 21 hours ago 1 @STas Kurilin, really? What heapspace size must I give? sarcastic laugh – The Elite Gentleman 21 hours ago 1 @The Elite Gentleman I don't know. But there are some) See for details oracle.com/technetwork/java/javacard/overview/… – Stas Kurilin 21 hours ago @The Elite Gentleman, you're absolutely right given a full fledged desktop machine with Linux, Java would run so fast his program could go back in time and rescue whales from extinction. – Quaternion 21 hours ago @Stas Kurlin, if you have a program that runs on a sim-card isn't it hard to get output? I've always found processorless environments problematic. – Quaternion 21 hours ago @Quaternion - It was a joke) I've newer wrote such programs. But, I think there should be some processor. – Stas Kurilin 20 hours ago @Stas Kurlin, I was joking too, but I have to apologize after reading that page you liked to. You can run Java off a smart card... that's crazy and cool. +1 on account of good learning for the day. – Quaternion 20 hours ago @Quaternion Thanks. I heard about this stuff several weeks ago. Java at a sim card is a really cool argument) – Stas Kurilin 20 hours ago @Quaternion, lol, without having to worry about Segmentation Faults along the way. – The Elite Gentleman 19 hours ago  I've been leaving comments on threads like this from time to time, asking them to be a little more forgiving, but that is a drop in the bucket. Nothing flag-worthy here, but not a &quot;nice&quot; as things once were. There is very little effort to understand what the question may really be, nor why to explain why the question has been closed, what other resources exist, or how that decision could be reversed. With a brand new user who probably has a hard time with English. Ouch. Do we need an official re-iteration of &quot;Be nice.&quot;? Is there something else we can do to encourage our big city to keep the small-town feel we grew up with? How to edit Parameters for an Object after it is created? When you first add a cylinder, you have the option to change the number of vertices, etc, but once you do anything else in blender, it seems you no longer can edit those parameters.   Is there a setting anywhere or an add-on that allows these parameters to be edited later on? If not, how easy would such an addon/feature be to create for anyone reading this? Why is the $(\frac{1}{2},\frac{1}{2})$ representation of the Lorentz group realized as the vector space of Hermitian $2\times 2$ matrices? How can I launch a GameObject at a target if I am given everything except for its launch angle? I am trying to launch an object at a target, given its position, its target position, the launch speed, and the gravity.  I am following this formula from :  $$ \theta = arctan \bigg( \frac{v^2 \pm \sqrt{v^4-g(gx^2 + 2yv^2)}}{gx} \bigg) $$  I have simplified the code to the best of my ability, but I still cannot consistently hit the target.  I am only considering the taller trajectory, of the two available from the +- choice in the formula.  Does anyone know what I am doing wrong?  using UnityEngine;  public class Launcher : MonoBehaviour {     public float speed = 10.0f;      void Start()     {         Launch(GameObject.Find("Target").transform);     }      public void Launch(Transform target)     {         float angle = GetAngle(transform.position, target.position, speed, -Physics2D.gravity.y);         var forceToAdd = new Vector2(Mathf.Cos(angle), Mathf.Sin(angle)) * speed;         GetComponent&lt;Rigidbody2D&gt;().AddForce(forceToAdd, ForceMode2D.Impulse);     }      private float GetAngle(Vector2 origin, Vector2 destination, float speed, float gravity)     {         float angle = 0.0f;          //Labeling variables to match formula         float x = Mathf.Abs(destination.x - origin.x);         float y = Mathf.Abs(destination.y - origin.y);         float v = speed;         float g = gravity;          //Formula seen above         float valueToBeSquareRooted = Mathf.Pow(v, 4) - g * (g * Mathf.Pow(x, 2) + 2 * y * Mathf.Pow(v, 2));         if (valueToBeSquareRooted &gt;= 0)         {             angle = Mathf.Atan((Mathf.Pow(v, 2) + Mathf.Sqrt(valueToBeSquareRooted)) / g * x);         }         else         {             //Destination is out of range         }          return angle;     } }