The lambda function is:  lambda x: x.split('=')   the partial function would look something like:  str.split('=')
How can I bind arguments to a Python method to store a nullary functor for later invocation?  Similar to C++'s boost::bind.  For example:  def add(x, y):     return x + y  add_5 = magic_function(add, 5) assert add_5(3) == 8
Let $x,y,z&gt;0$: Prove that:   $\frac{1}{(x+2y)^2}+\frac{1}{(y+2z)^2}+\frac{1}{(z+2x)^2} \geq\frac{1}{xy+yz+zx}$  I tried to apply Cauchy - Schwarz's inequality but I couldn't prove this inequality! Why are 50mm Lenses Cheaper? I want to find the interval of convergence of $$\sum_{n=0}^\infty (\frac{n}{n+1})^{n^2}(2x)^n$$ By the root test, $\sqrt[n]{|(\frac{n}{n+1})^{n^2}(2x)^n|}=|(\frac{n}{n+1})^{n}(2x)|$  And $(\frac{n}{n+1})^n=(1-\frac{1}{n+1})^n\to\frac1e$ as $n\to\infty$  So I've got an open interval(of convergence) s.t. $|\frac1e 2x|&lt;1\implies |x|&lt;\frac e2$.  Now I need to figure out whether the series is convergent or not at the end points, $x=\frac e2, -\frac e2$.  So there are two series I need to deal with, namely, $\sum_{n=0}^\infty (\frac{n}{n+1})^{n^2}e^n$ and $\sum_{n=0}^\infty (\frac{n}{n+1})^{n^2}(-1)^ne^n$.  Suppose $(\frac{n}{n+1})^{n^2}$ is increasing. Then $$(\frac{n}{n+1})^{n^2}&lt;(\frac{n+1}{n+2})^{(n+1)^2}\iff 1&lt;(\frac{n+1}{n+2})^{(n+1)^2}(\frac{n+1}{n})^{n^2}$$ $$\iff 1&lt;(1-\frac{1}{n+2})^{2n+1}(1+\frac{1}{n^2+2n})^{n^2}$$  But $(1-\frac{1}{n+2})^{2n+1}\to\frac{1}{e^2}$ and $(1+\frac{1}{n^2+2n})^{n^2}&lt;(1+\frac{1}{n^2})^{n^2}\to e$  So I have $1&lt;\frac1e&lt;1$, which is a contradiction. Hence $(\frac{n}{n+1})^{n^2}$ is not increasing. But I don't know if it's decreasing. (is it true that $(1+\frac{1}{n^2+2n})^{n^2}\to e$?)  If $(1+\frac{1}{n^2+2n})^{n^2}\to e$ is true, then $(\frac{n}{n+1})^{n^2}e^n$ converges to some positive number, so $\sum(\frac{n}{n+1})^{n^2}e^n$ diverges. But I don't know if it's decreasing: can't apply the alternating series convergence test(Leibniz's criterion).  So, can you help me with the two end points? Is there a page listing all fields? What kind of components are black blobs on a PCB? In low-cost mass-produced items I often run into black blobs of what looks like resin applied directly on top of something on the PCB. What are these things exactly? I suspect this is some kind of custom IC that is layed out directly on the PCB to save on the plastic  housing/connector pins. Is this correct? If so, what is this technique called?    This is a photograph of the inside of a cheap digital multimeter. The black blob is the only non-basic piece of circuitry present, along with an op-amp (top) and a single bipolar junction transistor. Protons and Neutrons Overshoot Actual Mass? When I add up the mass of 6 protons and 6 neutrons in amu, I get a mass that is greater than the mass of carbon. I thought that it should be the other way around, because I have not including binding energy when I add up the mass of the protons and neutrons.  Proton: 1.007276466812 u  Neutron: 1.00866491600 u  6(1.007276466812)+6(1.00866491600)=12.099  Carbon: 12 u  Why is this so? I am typing a command, I remember I have to check something, if I press Ctrl+U the command disappears and I can type something else, but then the command I was typing is not in the history.  Is there a way to recover that command, or a different shortcut that I can press to save somewhere the command? Subset data frame based on number of rows per group My images are blurry! Why isn't WPF's SnapsToDevicePixels working? I'm using some Images in my WPF applcation.  XAML:  &lt;Image Name="ImageOrderedList"        Source="images/OrderedList.png"        ToolTip="Ordered List"        Margin="0,0,5,5"        Width="20"        Height="20"        SnapsToDevicePixels="True"        MouseUp="Image_MouseUp"        MouseEnter="Image_MouseEnter"        MouseLeave="Image_MouseLeave" /&gt;   But, they appear fuzzy.  Why doesn't that SnapsToDevicePixels="True" line prevent this problem? Input password into SSH without typing How do I withdraw a paper from a journal after it was accepted but before it was fully published? On the advice of a senior colleague, I decided that I do not want to publish the paper anymore and with that journal. I wrote the editor several times; he has received the emails, but refuses to reply. I know he gets the emails because if its on other matters he has replied but not on the paper. I am ready to forfeit the processing fee I gave them but they refuse to reply and have already published the abstract of the paper to their site but not the full paper. Is legal action an option and do I have the right to sue? What are the guidelines in matters like these? Please add TeX rendering in titles on the iOS app TeX support works fine in question and answer bodies, and comments can be rendered manually by tapping and selecting Render MathJax. See related question .  However, the titles are not rendered which makes the browsing experience less than perfect. See screenshot below.   Are there any plans to implement MathJax support in titles?  (I'm running Stack Exhange iOS App Version 1.0.0 on an iPhone 4S with iOS 7.1.1)    EDIT: I was just informed about  asking for the same functionality for the Android app. I guess I shouldn't hope too much then... I am trying to add jQuery to my page (it is not being added by default). The file is adding to the page but after drupal.js causing the error:  SCRIPT5009: 'jQuery' is undefined  drupal.js, line 5 character 1    The code that adds drupal.js to the page in common.inc  ... 'misc/drupal.js' =&gt; array(           'data' =&gt; 'misc/drupal.js',           'type' =&gt; 'file',           'scope' =&gt; 'header',           'group' =&gt; JS_LIBRARY,           'every_page' =&gt; TRUE,           'weight' =&gt; -1,           'preprocess' =&gt; TRUE,           'cache' =&gt; TRUE,           'defer' =&gt; FALSE,         ), ...   In my module hook_init I have:    drupal_add_js('misc/jquery.js', array(     'group' =&gt; JS_LIBRARY,     'weight' =&gt; -20,     'cache' =&gt; TRUE,   ));   I would think with a lower weight it would load before drupal.js?  The header of the page contains the following scripts:  &lt;script type="text/javascript" src="http://mysite.com/misc/drupal.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/misc/jquery.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/misc/jquery.once.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/sites/default/files/languages/nl_c9aC92_wtuULa79-hTFcGPM53oqk1yKwciOa_Q3yO28.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/sites/all/modules/lang_dropdown/msdropdown/jquery.dd.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/sites/all/modules/lang_dropdown/lang_dropdown.js?mqdxrf"&gt;&lt;/script&gt; &lt;script type="text/javascript" src="http://mysite.com/sites/all/modules/devel/devel_krumo_path.js?mqdxrf"&gt;&lt;/script&gt; Rings' second isomorphism theorem I am thinking about the proof of the second isomorphism theorem, and something isn't very clear to me.   Let $R$ be a ring, $S\subset R$ a subring and $I\subset R$ an ideal. We have the natural homomorphism $f:R\rightarrow R/I$. The theorem states that $\mathrm{Im}(S)=(S+I)/I$. My question is why not simply $\mathrm{Im}(S)=S/I$?  I understand that it is not true (for starters, $S/I$ need not be a subring), but I cannot explain that to my self in a convincing way. Add new user and add meta at once Can someone explain __all__ in Python? I have been using Python more and more, and I keep seeing the variable __all__ set in different __init__.py files.  Can someone explain what this does? Let $R=\mathbb{Z}\left[\sqrt{−5}\right]$. Let $I=\left(2,1+\sqrt{−5}\right)$. Show $I^2 = (2)$ in $R$. I don't know how to solve this problem. I tried to write out the sum of products in the definition of products of ideals, but that doesn't seem to lead anywhere. Is a general GRE score of X sufficient for entry to postgraduate degree Y? Question: I got general GRE scores of VR (verbal reasoning), QR (quantitative reasoning), and AW (analytical writing).  Is this a good score to apply for entry to postgraduate degree in field X?  How will this score look to the selection committee?    Note: This is an intentionally generic GRE question (with unspecified scores and field of study) which is intended as a template for a large number of questions asked on this forum regarding evaluating the scores on the general GRE test (e.g., , , , , , , , and ).  This question seeks answers that are applicable for an applicant for graduate-level programs in any field, based on any scores in the GRE general test.  The goal of this question is to provide a general reference to avoid the need for specific questions with particular scores/field of study. What happens to options held during a reverse stock split? I held 1 put option for 100 shares of USO that expires on May 8. Yesterday, USO underwent an 8:1 reverse stock split. My options are now for USO1 instead of USO, but what does that mean?  The strike price hasn't changed, so does that mean that my option will expire worthless as it's unlikely the stock will drop (significantly) to back below the strike price? I would like to connect a USB Mouse, Keyboard or Storage Device to my Nexus 4. So far I know, for this USB OTG must be supported. Unfortunately I can not find any actual information about this.  Does anybody know whether USB OTG is supported by Ubuntu-Touch? If yes, does anybody know if it would work with a Nexus 4 device?