Problem with installing testdisk in Ubuntu 14.04 LTS
"Unable to locate package" while trying to install packages with APT
Interaction between Leyline of Anticipation and Teferi, Time Raveler With the reprint of  in Core Set 2020, the interaction with  came to mind and I couldn't figure out what is right.  If I have the Leyline and my opponent has Teferi, may I cast spells during my opponent's turn? Show that every irrational number in $\mathbb{R}$ is the limit of a   sequence of rational numbers. Every rational number in $\mathbb{R}$ is   the limit of a sequence of irrational numbers.   How can I prove this? Would a backpack or cargo rack be better for commuting? Right now I use a backpack to hold all of my supplies including spare tubes, pump, patch kits, tools, my change of clothes for work, etc.  This is the backpack I use:    It's about as comfortable as a backpack can get without getting into the hiking backpacks with frames. Altogether I would say it weighs no more than 10 lbs max. The muscles in my back get slightly irritated during my commute.  Would it be more comfortable to use a rear cargo rack on my bike instead? Will adding more weight to the bike change how the bike rides and feels?  EDIT: After doing some research I came across  that explains the different methods of carrying your gear on commutes and how it affects your body. It's worth a look.  EDIT #2: Having tried both for a couple of weeks now, I can say that (for me personally) the backpack is the better way to go given the relatively light weight I have to carry.  If you do use a backpack, make sure that the straps are tightened enough so that it's positioned higher up on your back and to the point to where there is little to no movement on your back. This makes a world of difference when it comes to comfort. Suppose that X and Y are independent Poisson distributed values with means $\theta$ and $2\theta$, respectively. Consider the combined estimator of $\theta$ $$ \tilde{\theta} = k_1 X + k_2 Y $$ where $k_1$ and $k_2$ are arbitrary constants.   Find the condition on $k_1$ and $k_2$ such that $\tilde{\theta}$ is an unbiased estimator of $\theta$. For $\tilde{\theta}$ unbiased, show that the variance of the estimator is minimized by taking $k_1 = 1/3$ and $k_2 = 1/3$. Given observations $x$ and $y$ find the maximum likelihood estimate of $\theta$ and hence show that $\tilde{\theta}$ is also the maximum likelihood estimator.   I have gotten (1) and (2) okay, but it's (3) I am having trouble with, I'd be okay if $X$ and $Y$ had the same parameter but I'm having trouble with $X$ and $Y$ having different parameters, any help would be appreciated.   NOTE   For (1) I got $k_1 = 1 - 2k_2$.   For (2) I found the variance of $\tilde{\theta}$, then differentiated and let equal to zero to minimize - therefore we get (after subbing in $k_2 = 1 - k_1/2 $) $$3k_1-1=0,$$ which when subbing in $1/3$, we see it is minimised.   Thank you. Question:  Show that $n^2 + 3n + 5$ is not divisible by $121$, where $n$ is an integer. Sylow 2-subgroups of the group $\mathrm{PSL}(2,q)$ What is the number of Sylow 2-subgroups of the group $\mathrm{PSL}(2,q)$? Double Range for Storm Sphere with Spell Sniper Spell Sniper says:     When you cast a spell that requires you to make an attack roll, the    spell’s range is doubled.   Can I apply that to the part of Storm Sphere that says:     Until the spell ends, you can use a bonus action on each of your turns   to cause a bolt of lightning to leap from the center of the sphere   toward one creature you choose within 60 feet of the center. Make a   ranged spell attack. You have advantage on the attack roll if the   target is in the sphere. On a hit, the target takes 4d6 lightning   damage.   The spell itself does not require the caster to make an attack roll. But there is the option to make a spell attack. I'm not sure if the Spell Sniper feat could be applied here.  Would the lightning attacks of the Storm Sphere benefit from the Spell Sniper feat? Is the sum of all natural numbers countable? I frequently need to do the following things in MySQL:   Create a non-root user Set that user's password Grant that user all privileges Make a database with the same name as the new user Allow usage only for users from the localhost.   Previously I did this using PHPmyadmin, but I would prefer doing it directly from BASH. Is there a CLI way to execute these steps? Dedicated mysql server slow response Let $m \in \mathbb{Z^+} , n \in \mathbb{Z^+}$ and let $d=\gcd(m,n)$. Prove that $m\mathbb{Z}+n\mathbb{Z}=d\mathbb{Z}$ Can't install wine on Ubuntu 14.04 I cannot install Wine on Ubuntu 14.04.  When I try to install it on the Ubuntu Software Center I always get a message that says I have unmet dependencies. I tried installing Wine through the terminal and I get this:  Reading package lists... Done Building dependency tree        Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation:  The following packages have unmet dependencies:  wine : Depends: wine1.6 but it is not going to be installed E: Unable to correct problems, you have held broken packages. Can I ask a postdoc who has closely supervised my research to write me a letter of recommendation? During Winter Bash, users can earn hats. But sometimes it seems that a hat was awarded even though its requirements weren't (yet) met, or vice versa.  What could be the reason for this? Do we have $\lim_{h\to 0^+}\int_0^\infty|f(t+h)-f(t)|dt=0$? Let $f:\mathbb{R^+}\to\mathbb{R}$ be an integrable function ($f\in L^1(\mathbb{R}^+,\mathbb{R})$). Do we have $$\lim_{h\to 0^+}\int_0^\infty|f(t+h)-f(t)|dt=0$$ ? How can we prove it ? Why did I receive a message saying I have been granted a privilege, yet I don't have enough reputation? The site shown a message saying I have been granted a privilege, but the reputation required for that privilege is higher than the one I actually have. What happened? Find which date is missing in the results Sound of a next scene starts one moment earlier than video I saw this several times in different movies, but I don't understand what is this supposed to mean. The main idea is when the scene is about to change, for one second or so we still see the picture from the old scene, but the sound is already coming from from the upcoming scene. Why do they do this? What's the purpose of this technique? line of mathematicians guess their own hat color out of c colors There is a common problem in which a long line of N mathematicians are each given a hat that is either red or blue.  They cannot see their own hat but can see all in front of time and can hear any response. They must state their own hat color from the back of the line forwards and no information may be passed besides their guess.  They may have a planning session in advance.  What is the maximum number of correct guesses can they guarantee?  The answer is (look away if you don't know) $N-1$.  If, instead of 2 colored hats, we use $c$ different colored hats, how many can we guarantee?  Assuming $N&gt;&gt;c$  I believe the answer to be $N-c+1$ and have confirmed this for $c=2, 3$, and $4$.  I believe this should be simple to prove by using the concept of "$x$ formulas allow you to solve for $x$ variables" but I am not well versed enough in pure mathematics to answer this. What is the best (or preferred method) of setting a url parameter on a visualforce page embedded on a standard layout page?    This is easy to do when creating a custom link or a button, but I don't get how to do this on page load via the Apex Controller for the page.   When using a custom button you can do something like /apex/MyPageName?parameter=value  Can I use something like this?   ApexPages.currentPage.getParameters().put('Id',myId)