Solution for outdated Ubuntu Version 12.04
How do I find out which version and derivative of Ubuntu is right for my hardware in terms of minimal system requirements?
Subsetting matrices Children's book with "square triangles" in parallel universe? What is the connection between regularization and the method of lagrange multipliers ? To prevent overfitting people people add a regularization term (proportional to the squared sum of the parameters of the model) with a regularization parameter $\lambda$ to the cost function of linear regression. Is this parameter $\lambda$ the same as a lagrange multiplier? So is regularization the same as the method of lagrange multiplier? Or how are these methods connected? a) Give a combinatorial proof that for every $n \geq r \geq 1$ that:  $$\sum_{i = 0}^{n} \binom{i}{r - 1} = \binom{n + 1}{r}$$  And use (a) to concoct a formula for $1^2 + 2^2 + ... + n^2$ Almost universal class I so stuck with a problem of set theory. But first a recursive definition:   Define $R_0=\emptyset$ If $R_\alpha$ is defined, then $R_{\alpha+1}=\mathcal{P}(R_\alpha)$ (the power set). For a limit ordinal $\gamma$, if $R_\alpha$ is defined for all $\alpha&lt;\gamma$, then define $R_\gamma=\displaystyle\bigcup_{\alpha&lt;\gamma} R_\alpha$   We define $\text{BF}=\displaystyle\bigcup_{\alpha\in\text{OR}} R_\alpha$ (the class of well founded sets).  Next, my problem     Take $A\subseteq \text{BF}$ a proper transitive class such that $(A,\in)\models\text{ZF}$. Prove that $A$ is almost universal.    I think that the exercise is false because if it was true, then we could conclude that the strongly inaccessible cardinals doesn't exists. This because if $\kappa$ is strongly inaccessible then $R_\kappa$ satisfies the hypothesis but $R_\kappa$ isn't almost universal. I really appreciate any hint or/and suggestion.   Edit: my counterexample is wrong. But, then, how can I solve the exercise? Find $\,\lim_{x\to 1}\frac{\sqrt[n]{x}-1}{\sqrt[m]{x}-1}$ Cannot install a version of GDAL via Anaconda that permits reading BigTIFFs How to book this complex multi carrier roundtrip flight I found on ITA? I am trying to book a roundtrip ticket from Chicago O'hare (ORD) to Mumbai, India (BOM). Traveling on Aug 9th and returning on Aug 24th. Now, I've been looking for several days (almost 10days!) for ways to book this itinerary I found on ITA. All other websites like Expedia, Kayak, Travelocity, Momondo, RouteHappy, and even google flights are quoting around $1200 roundtrip cost, sometimes as low as $1150. But the ITA Matrix website shows me several options, the lowest is $916 roundtrip.      You can see there are several flights in the $900 range.     For the return trip there is only one option to get the low price.  Selecting the flights this is what I get:      I'm not sure how to use the fare codes the ITA website provides to purchase this itinerary.  These are some of the things I have tried to book the complex multi-carrier flight from ITA:  My first method was to try coding into HIPMUNK, using the multi-city option, my departure, connections, airlines flights number and dates. Following this method:     And the results page:    Here's what my code into HIPMUNK looks like:  ORD::LH9151 FRA LH756 for the first journey and   BOM::LX155 ZRH SN5104 BRU SN8803 for the return trip.  Don't think I'm making any mistakes in coding it, but there are two adjustments I also made which failed:   I used the dates of the first leg of the flight then tried using the other dates as well. So for example Aug 9th and Aug 10th. I used the codes for the operating carriers and when it didn't work, the marketing carrier leaving the flight number unchanged.   This always returned no results. Breaking up the itinerary to just the oneway from ORD to BOM worked but gave me a price of $624. For some reason the second return trip was creating problems. I tried breaking he return trip down into different segments but no luck. Anyone knows why the return trip is creating difficulties? Coding issues/ hipmunk doesn't have such a large database?   Then I tried method 2: Calling up the airlines  United was able to find all the segments, even price it correctly sometimes (sometimes not) and gave me a confirmation number. I was to call them in 12hrs to check if they were able to procure the seats but when I did call they were not able to get the seats for the SWISS flight from BOM to ZRH and/or from ZRH to BRU. I've tried this at least 5 times changing small things everytime, but the same result. It seems Lufthansa waits for SWISS to confirm the seats but SWISS doesn't respond in time and I'm not able to book.  I tried calling Lufthansa but they were not even able to find the segments and instead told me to look at booking online where I will be able to find it cheaper.  Any insights into the methods that failed or suggestions on how to book this itinerary at the $900 price will be much appreciated. Thanks in advance. A fly in an accelerating car A fly is flying around in a car, the fly never touches any surface in the car only fly’s around in the air inside the car. The car accelerates. does the fly slam in to the rear window. or does the fly continue to fly uninterrupted? Installing a strong-tie post anchor on unlevel concrete onKeyUp not firing for ESC in IE I'm stuck with an uninstallable module. Drupal insists that there are Fields pending deletion and that the module can not be uninstalled. I've run cron zillion times already as advised for such situations but without success. Cron runs fine, but drupal insists that still, Fields pending deletion.  Visiting /admin/reports/fields gives no clues - the fields provided by that module are not listed. I even tried using drupal console to uninstall module with --force switch, but also without success.  I also tried drush field-info in hope to get some clues, but that's apparently not yet implemented as drush 8.1.2 gives fatal error:     Call to undefined function field_info_fields().   How do I make drupal delete those fields that pending deletion? Do I have to do this manually in database?  I've seen few tables like field_deleted_data_f5e7b87e32 or field_deleted_revision_be01eddd10 but they are all empty. Is that even relevant? Why does Python's itertools.cycle need to create a copy of the iterable? Does "the same number of people" behave as singular or plural? How can I dynamically load the functions of java.lang.Math Using Integration By Parts results in 0 = 1 I've run into a strange situation while trying to apply Integration By Parts, and I can't seem to come up with an explanation.  I start with the following equation:  $$\int \frac{1}{f} \frac{df}{dx} dx$$  I let:  $$u = \frac{1}{f} \text{ and } dv = \frac{df}{dx} dx$$  Then I find:  $$du = -\frac{1}{f^2} \frac{df}{dx} dx \text{ and } v = f$$  I can then substitute into the usual IBP formula:  $$\int udv = uv - \int v du$$  $$\int \frac{1}{f} \frac{df}{dx} dx = \frac{1}{f} f - \int f \left(-\frac{1}{f^2} \frac{df}{dx}\right) dx$$  $$\int \frac{1}{f} \frac{df}{dx} dx = 1 + \int \frac{1}{f} \frac{df}{dx} dx$$  Then subtracting the integral from both sides, I've now shown that:  $$0 = 1$$  Obviously there must be a problem in my derivation here...  What wrong assumption have I made, or what error have I made?  I'm baffled. Bash while read loop breaking early I've been banging my head against for wall for a while with this one.  I want to SSH into a set of machines and check whether they are available (accepting connections and not being used). I have created a small script, tssh, which does just that:  #!/bin/bash  host=$1 timeout=${2:-1}  ssh -qo "ConnectTimeout $timeout" $host "[ \`who | cut -f1 | wc -l \` -eq 0 ] &amp;&amp; exit 0 || exit 1"   This script works correctly. Returning 255 if there was a connection problem, 1 if the machine is busy and 0 if everything is good. If anyone knows a better way to do this please let me know.  So next I try and call tssh on my set of machines using a while read loop, and this is where it all goes wrong. The loop exits as soon as tssh returns 0 and never completes the full set.   while read nu ; do tssh "MYBOXES$nu" ; done &lt; &lt;(ruby -e '(0..20).each { |i| puts i }')   At first I thought this was a subshell problem but apparently not. Any help, along with comments on style/content, would be much appreciated! I know I'm going to kick myself when I find out why... Suppose f(m,n) is a double sequence in $\mathbb R$. Under what condition do we have $\lim\limits_{n\to\infty}\sum\limits_{m=1}^\infty f(m,n)=\sum\limits_{m=1}^\infty \lim\limits_{n\to\infty} f(m,n)$? Thanks! What's the main difference between int.Parse() and Convert.ToInt32 What is the main difference between int.Parse() and Convert.ToInt32()? Which one is to be preferred return eats exception I found the following behavior at least weird:  def errors():     try:         ErrorErrorError     finally:         return 10  print errors() # prints: 10 # It should raise: NameError: name 'ErrorErrorError' is not defined   The exception disappears when you use return inside a finally clause. Is that a bug? Is that documented anywhere?  But the real question (and the answer I will mark as correct) is: What is the python developers' reason to allow that odd behavior?