Good book on quantum field theory to start learning as an undergraduate?
A No-Nonsense Introduction to Quantum Field Theory
Need to find the recurrence equation for coloring a 1 by n chessboard Synchronize/change Area51 profile image I just visited  and noticed that my profile picture is not the same as on all other sites.  According to  the image will be synchronized when synchronizing the complete profile. I did that but the image is still the same.  Then I wanted to change the image in the Area51 profile directly - but I can only change to a gravatar image and can't use the new and fancy Stack Exchange image.  Is that a bug? Basic Electronics Book I need basic electronics books  (diodes,transistors,current.. etc) as I am just starting out with electronics and want to have something to read over the holiday.  Any suggestions of good beginners' books? Buffering in meters/km using WGS84 layers using QGIS I am using QGIS 1.7.4-Wroclaw and working with an SHP layer in WGS84. I want to buffer out to a certain number of kilometers from this layer using the ftools buffer tool.  I understand that the buffer tool always uses the layer units, which for WGS84 are decimal degrees. We all know that degrees don't convert consistently to meters, so how should I go about making my buffers?   Is it necessary for me to convert the shapefiles to a different CRS that natively uses meters?   If so, how do I choose one? future or present with when I just would like to know if this sentence would be grammatically correct and in which cases should I use it:  I don't know when he is back instead of he will be back . I know the rule with when "no will" in most cases but we can say" please let me know when it will be available or when it is available"  If that's not correct let me know why please How do I add reCaptcha to a custom form? I need to add a reCaptcha to my form; creating the form then adding the form ID to the reCaptcha settings did nothing. How do I send all information in /var/adm/message file to a remote system? I'm trying to figure out how to send all information that is normally identified in the /var/adm/message file on a Solaris system to a remote system. Some things I know:  omega_1 is the first uncountable ordinal, made up of all of the countable ordinals f is not necessarily continuous    For this proof, I currently have x as a condensation point in my range, and I know that (x - (1/n) , x + (1/n) ) is uncountable and everything to the left and right of this interval is countable. I understand that I want to shrink this interval small enough just to x (which will be my constant), making everything around x eventually countable. I also understand that this will eventually make all of the elements in omega_1 go to x but I am having a hard time seeing where my contradiction comes in. I also am struggling with writing this proof in a presentable fashion.   Thank you! Variable is already defined in method lambda How do I find least cost path over a DEM based on slope magnitude and direction? What sort of algorithms can I use to find a least cost path through a DEM where it costs more to traverse a cell going downhill or uphill than it does to follow the contour of the land?  All the examples I've seen involve creating a least cost surface where the magnitude of the slope is part of the cost - but the direction isn't.    Additionally, the examples assume the cost to travel through a cell does not depend on the direction of travel. I have seen many folks doing this  concluding that shadow from point A on the Moon can travel to point B on the Moon faster than light.  What I fail to understand here (and I am sure I am wrong), is nothing can travel faster than light. I also read about Relativity where Einstein stated that every event happening for you depends on how fast the light gets from where the event is happening to you.  This is my particular problem with this Moon shadow experiment. You cannot make a shadow travel faster than light, because in order for the "disappearance" of light to get to the Moon, it has to travel at light speed.  Here is one way to understand my point. Consider we shine a flashlight on Moon, like the guy in the linked video did, we move the finger across the face of the flashlight, before we moved the finger it was casting the shadow at Point A on Moon, after we finish moving our finger, the shadow is at Point B on the Moon.  When the finger reaches the end of it's moving length, the light waves that have left the flashlight before the finger reached there will have to hit Point B and it will take them a second and a half to get there, and another second and half for us to see that shadow on point B, which makes it 3 seconds + finger moving time for us to actually see the shadow at point B. That means shadow traveled (say) across the diameter of the Moon in 3 seconds.   So. about 3000 Km in ~3 seconds make it 1000 Km per seconds which is very tiny compared to the speed of light. How can these experiments conclude that Shadow could be made to travel faster than light? What is the obvious clue that I am missing here? how to fix the width of the columns in the latex table? I have a table with long heading names. I want to fix the the width of the columns. When I do so the text flows out if the column. Any suggestion about fixing it.  Here is the example   \begin{table*}[ht] \begin{tabular}{|l|r|r|r|r|r|} \hline Image &amp; Score  &amp; here is a lot of text &amp; agian a lot &amp;a lot and a lot&amp; and the same here\\ \hline a \(left\) &amp; 1 &amp; 1 &amp; 1 &amp; 1 &amp; 1  \\ \hline b \(right\)&amp;  1 &amp;1 &amp; 1 &amp; 1 &amp; 1  \\  \end{tabular}  \end{table*} Comparisons: "so [adjective/adverb] as" or "as [adjective/adverb] as" which of the following is NOT a possible value of $(e^{f})''(0)$?? Let $f$ be an analytic function on $\bar{𝐷} = \{z \in \mathbb{C}: |z| \le 1\}$. Assume that $|𝑓(𝑧)| ≤ 1$ for each $z\in \bar{D}$. Then, which of the following is NOT a possible value of $(e^{f})''(0)$??  $(A) 2$  $(B) 6$  $(C) \frac{7}{9}e^{\frac{1}{9}}$  $(D) √2 + 𝑖√2$  So I take a look at Cauchy Integral Formula and then $$(e^{f})''(0)=\frac{1}{\pi}\int_{|z|=1}\frac{e^{f(z)}}{z^3}$$  Taking modulus on both sides we have $$|(e^{f})''(0)| \le \frac{e}{\pi}2\pi=2e$$  Hence (b) cannot be the choice.   Is this alright!!  Thanks for the help! LINQ's Distinct() on a particular property How do I resize/change resolution of pictures easily? How to resolve the C:\fakepath? Autoexpand UITextView height dynamically in ios Are delphi variables initialized with a value by default? Unity shows wrong distribution name