Can somebody help me with some extra explications about iPhone activation? I had read this  and understood that this activation allows the end-user to access the home screen of the smartphone with all its apps. But I don't understand what is happening behind the scene of an activation. What information is the smartphone sending to the Apple servers? And what is the smartphone expecting to receive back from these servers?  Also, I will write bellow all my questions to have some order in the ideas.  1) Can I bypass this activation to use the smartphone? ( Something similar to Samsung bypass. I don't know, I am trying to make some analogy )  2) If I don't activate the iPhone can I install a custom OS? ( in the Android world I can install a custom OS from Cyanogenmod )  3) Why doesn't Android devices have this activation step?  4) If I don't activate the iPhone, can I jailbreak it?  5) When would the activation fail, and not because of the bad internet connection?  6) Can I, us a developer/hacker do anything with the iPhone if I am not activating it by executing any  to change any settings in any way. And after the activation, the changes done by me to be reset to default?  7) Can I set my iCloud account if the iPhone is not activated?  To don't understand me wrong, I understand that when I am buying an Apple smartphone from the local store, my friend or whoever is selling it. I am paying for the hardware and the software, and this is one of the reasons for these devices to be expensive. But why, should I (the end-user) bother to activate this phone when I know, that the software is bound to the hardware?  Thanks in advanced
This is something I don't particularly understand. I get that for Windows, activation exists to prevent software piracy, but you don't have to pay for iOS. Perhaps activation exists to prevent Android devices from using iOS or to prevent jailbreaks and downgrades? Anyone know the real reason why?
What was the issue solved by the new "using" syntax for template typedefs? So, let's take Skeptics.SE for an example. You can become a trusted user when you acquire 4000 rep., not 20000  I was like, wow, so is it like this because of the lack of users on Skeptics.Se, as in, not so much as Stack Overflow or something?  Why do some sites need less reputation to be a trusted user? Can sum of a rational number and its reciprocal be an integer? Can sum of a rational number and its reciprocal be an integer?   My brother asked me this question and I was unable to answer it.   The only trivial solutions which I could think of are $1$ and $-1$.  As to what I tried, I am afraid not much. I have never tried to solve such a question, and if someone could point me in the right direction, maybe I could complete it on my own.  Please don't misunderstand my question.   I am looking for a rational number $r$ where $r + \frac{1}{r}$ is an integer. How to modify an invalid '/etc/sudoers' file? How do I edit an invalid sudoers file? It throws the below error and it's not allowing me to edit again to fix it.  Here is what happens:  $ sudo visudo &gt;&gt;&gt; /etc/sudoers: syntax error near line 28 &lt;&lt;&lt; sudo: parse error in /etc/sudoers near line 28 sudo: no valid sudoers sources found, quitting How can I shorten my command line (bash) prompt? Currently it is:   michael@Castle2012-Ubuntu-laptop01:~/Dropnot/webs/rails_v3/linker/spec/controllers$   Outside of renaming my machine and directory structure...  How could I make it be something more like:  michael:controllers$ How old were each of the Doctor's incarnations? I'm trying to get the subcaptions and captions in sanserif font and Uppercased. According the manual of the caption package this should be possible in the following way.However, this doesnt seem to work. Am I defining something in the wrong way here?  \documentclass{article} \usepackage{floatrow} \usepackage[demo]{graphicx} \usepackage{subfig} \usepackage{caption} \floatsetup[figure]{subcapbesideposition = top}  \captionsetup{labelfont={sf,up}, labelsep=period, format = plain, singlelinecheck = false, textfont=rm, skip = 2pt} \captionsetup[subfloat]{labelfont = {up,sf},format = plain,textfont = rm,labelformat = simple, labelsep = period}  \begin{document}   \begin{figure}[h!]   \ffigbox[\textwidth]     {\begin{subfloatrow}         \sidesubfloat[]{\includegraphics[width = 0.4\textwidth]{A.pdf}}%         \sidesubfloat[]{\includegraphics[width = 0.4\textwidth]{B.pdf}}%       \end{subfloatrow}       \begin{subfloatrow}         \sidesubfloat[]{\includegraphics[width = 0.4\textwidth]{C.pdf}}%         \sidesubfloat[]{\includegraphics[width = 0.4\textwidth]{D.pdf}}%       \end{subfloatrow}}     {\caption{this is a caption}} \end{figure}  \end{document} Prove: $|a\sin x+b \cos x|\leq \sqrt{a^2+b^2}$ $$|a\sin x+b \cos x|\leq \sqrt{a^2+b^2}$$   I have tried: $$|a\sin x+b \cos x|\leq |a+b|\leq \sqrt{a^2+b^2}$$  enough to prove: $$|a+b|\leq \sqrt{a^2+b^2}$$  But I can find how to continue from here A couple years ago, it was easy to root any device: Install KingRoot, KingoRoot, or a similar app, hit the large ROOT button, and let it do the rest. After 5 minutes or so, a green "Root Succeeded!" prompt will pop up, and we can choose to keep the root app, or uninstall it and install a clean root manager app like SuperSU/Superuser.  How do they work? Why aren't they working anymore? And if they work, should I use them or not? Should initial e's after h-dropping be capitalized? A new Victorian-set British novel begins sentences containing h-dropping with lower-case e's, as in " 'e took my money, 'e did." This seems incorrect but I'm at a loss to find the rule. Rotate Geographic map How do I develop black and white negatives at home? Is this mold? Black? White? Guys I need to find out what this is- it's also on my wooden bed racks JavaScript closure inside loops – simple practical example How would I solve the following problem involving elementary matrices? Let $A=\begin{pmatrix}0&amp;5\\ 7&amp;4\end{pmatrix}$.      1) Write $A$ as a product of $4$ elementary matrices.      2) Write $A^{-1}$ as a product of $4$ elementary matrices.   My work. I have managed to find $A^{-1}$, which came out to be this:  \begin{pmatrix}-\frac{4}{35}&amp;\frac{1}{7}\\ \frac{1}{5}&amp;0\end{pmatrix}  However, I am struggling to figure out how I would split each of these matrices into $4$ elementary matrices. Any help? Jack probs with heaphones/earbuds So I already asked this question, but I couldn't respond to the answers. I can't hear out of the left ear of any headphones/earbuds because I have to push the jack towards the Earth to hear out of it. It seems you guys think the jack is the problem when I'm pretty sure it's the computer (my Acer laptop). I also forgot to mention the headphones (PX22 Turtle Beaches) work with both ears, but I have to plug in the usb extension cord in order for that to work (it's also the same cord that enables the mic on my headphones), plus I lost the cord. Thanks 4 hewps. Is the Ratio of Associative Binary Operations to All Binary Operations on a Set of $n$ Elements Generally Small? I started thinking about the number of associative (binary) operations on a set with $n$ elements today.  Looking online I found  which indicates only $113$ of the possible $19,683$ operations on a three-element set satisfy association.  So, $50\%$ of binary operations on a two-element set satisfy association, and less than $0.6\%$ of all binary operations on a three element set satisfy association.  For an $n$-element set, where $n$ denotes a natural number, is the ratio $R_{n}=A_{n}/B_{n}$, of the number of associative binary operations $A_{n}$ to the number of all binary operations $B_{n}$, in general small?  I don't mean the following questions as equivalent, but since they seem more concretely answerable in principle, does   $$ \lim_{n \to +\infty} \frac{A_{n}}{B_{n}} = 0 ? $$       Also, is $F : n \to R_{n}$ a monotonically decreasing function?  Some Background of the Question: In his Linear Algebra Problem Book 1995 on p. 6 Paul Halmos writes "The commonly accepted attitudes toward the commutative law and the associative law are different.  Many real life operations fail to commute; the mathematical community has learned to live with that fact and even to enjoy it.  Violations of the associative law, on the other hand, are usually considered by specialists only."  For all I know, Halmos might only have written that to motivate the study of Linear Algebra and doesn't quite literally mean what he appears to say.  But, if he means what he appears to say, and if $F : n \to R_{n}$ is monotonically decreasing, or $R_{n}$ is generally small, I think there's something amiss with what Halmos says, since non-associative operations seem so common that one may as well enjoy them. it has the guide for 12.10 but not newer ones plz someone help Why is the Java plugin (JRE) disabled in Chrome? Are there any published details of Kenobi's communication with Lars family on Tatooine before ANH?