I have applied for a standard UK visit visa (6 months). I got the visa with a validity starting on 14 August 2018 (FROM DU date 14/08/18).  So can I travel from India on that date if I have a flight for the UK on 14/08/18 at 02:30 am?  My nationality is Indian. My journey starts from my country.
I'm a US citizen and I've already gotten my Tier 4 visa to study in the UK in my passport, however, it looks like the start date on the visa and the letter to present to the Immigration Officer has allowed me entry an extra week on top of the usual month. My school starts on September 24th, but my visa states permission to enter on August 17th. I've read that you are only allowed a month before the beginning of school, but my visa is saying differently!  Should I assume its wrong and enter on the 24th or is it okay for me to enter on the 17th?   Thanks.
Converting GeoJSON to Shapefile using ogr2ogr? I have a GeoJson file that I want to convert to ESRI Shapefile using ogr2ogr in FWTools.  I tried using   ogr2ogr -F "ESRI Shapefile" filename.shp geojsonfile.json OGRGeoJSON   I got output      ERROR 6: Can't create fields of type StringList on shapefile layers. ERROR 1: Attempt to write non-polygon (POINT)   geometry to  type shapefile. ERROR 1: Terminating translation   prematurely after failed translation of layer OGRGeoJSON   GeoJSON input we are giving is in standard geojson format.  content of geojson are like  {to share I took only a part from features array }  {"id":1223, "properties":{"name":"3","level":2}, "map_version":11,"type":"FeatureCollection","x_id":1234,"obj_type":"LevelGeometry", "features":[  { "my_area":[131.40093253528894,33.58879853190332,6.515867411008615,3.490549810987222,-0.6237271428108215], "id":1984791, "location":{"type":"Point","coordinates":[131.4009325,33.5887985]}, "properties":{"display_name":"xyz"}, "type":"Feature", "geometry":{"type":"Polygon","coordinates":[[[131.4009508,33.5888314],[131.4008895,33.5887946],[131.4009148,33.5887653],[131.4009761,33.5888020],[131.4009508,33.5888314]]]}, "obj_type":"Geometry" }  ] } Is it possible to do vector calculus in Mathematica? There are a number of services that will scan a website for vulnerabilities and allow the display of a trustmark image if the site passes their tests.  This allegedly increases the level of trust a potential client feel toward the website and therefore makes them more likely to complete a purchase.    McAfee claims it has studies which show significant increases in sales. Should I take their word for it?  What sort of increase should I really expect, if any?  Are these types of services worth the prices they charge? From command line open package installer I want to propose for a Persian version of Super User (I will explain why later) so I want to create a proposal in Area 51, but this means non-English question and answers, Is this OK? P.S: This may be a question for other non-English proposals too. Update: The main question is: How can non-English site proposals pass the Commitment phase? How can the English community support non-English proposals? You can find some information in  about the Stack Exchange 2.0 Site Creation Process (specially Commitment phase):  How does this thermometer work? Intuitively, if Jon Skeet says that he’ll participate in the Sock Puppet Stack Exchange, that commitment is a better sign that the site will succeed than if we get a commitment from a random Internet user who has never participated in Stack Overflow. Sure, they’re both wonderful people, I’m sure, but Jon Skeet has proven that he likes to participate in Stack Overflow so it’s a good bet that he’ll participate in SockExchange, too. .... we’re going to require a selection of existing users with certain badges and reputation that proves that they’ll participate. For instance (and I’m making these numbers up), we might require that a site get at least 100 commitments from people with the Teacher badge, at least 20 from people with the Enthusiast badge, and at least 50 from people with a reputation of 1000 or more on some of our sites. How can I recursively clear the "Hidden" file flag on Windows Vista? A friend's computer was recently infected with a virus.  I hope the virus has been removed successfully. But, it appears that the virus set the "Hidden" flag on most directories and files on the system.   What's the most convenient way to clear this flag from selected directories and their contents? unzip error "End-of-central-directory signature not found" I try to unzip a zip file, but got an error:  $ unzip COCR2_100.zip  Archive:  COCR2_100.zip   End-of-central-directory signature not found.  Either this file is not   a zipfile, or it constitutes one disk of a multi-part archive.  In the   latter case the central directory and zipfile comment will be found on   the last disk(s) of this archive. note:  COCR2_100.zip may be a plain executable, not an archive unzip:  cannot find zipfile directory in one of COCR2_100.zip or         COCR2_100.zip.zip, and cannot find COCR2_100.zip.ZIP, period.   I googled but didn't find a solution. I was wondering why it is and how I should fix it? Thanks!  The zip file can be downloaded from . It is an application, and here is its website .  My OS is 10.10. $\operatorname{Aut}(V)$ is isomorphic to $S_3$ I'm currently working my way through Harvard's online abstract algebra lectures (if you're interested, you can find them ).  The lectures come complete with notes and homework problems.  Of course, since I don't actually go to Harvard, I can't hand in the homework assignments to find out if I'm doing them correctly.  So I've decided to try to crowd source the grading of my solutions.  I'll post individual questions as I finish them and wait for comments.  I would like to get critiques of not just my reasoning but the style of my write ups as well.  Also, any alternative approaches to the problem would be welcome.  I've looked for forums dedicated to these kinds of OCW courses but have not been able to find any.  This surprises me.  It seems like, with the advent of these free online educational resources, an online meeting place for those who take advantage of them would be a natural offshoot.  So this might be a bit of an experiment.  Unless I'm the 873rd person to post something like this here.  If that's the case, sorry for being so long winded.  Anyway, on with the question.  This one is assigned in the 4th lecture.     Let $V$ denote the Klein 4-group.  Show that $\operatorname{Aut}(V)$ is isomorphic to $S_3$.   (I've moved my solution below to keep this question from showing up in the unanswered list.)  Thanks... Short Story about interminable rain on Venus Why can't I seem to grasp interfaces? Could someone please demystify interfaces for me or point me to some good examples? I keep seeing interfaces popup here and there, but I haven't ever really been exposed to good explanations of interfaces or when to use them.  I am talking about interfaces in a context of interfaces vs. abstract classes. Dimension of cone of projective variety Why is the upper Riemann integral the infimum of all upper sums? I was reading the theory of Riemann integration when I cam across the following ,   If $f$ is bounded on $[a,b]$, and $P = \{x_0,x_1,x_2.......x_n\}$ is a partition of $[a,b]$, let $$M_j = \sup_{x_{j-1}\leq x\leq x_j}f(x)$$ The upper sum of f over P is $$S(P) = \sum_{j=1}^{n} M_j(x_j-x_{j-1})$$ and the upper integral of $f$ over $[a,b]$, denoted by $$\int_{a}^{b^-} f(x)dx$$ is the infimum of all upper sums.  The theorem similarly goes on to state the result for lower sums.  My doubt is : I do not understand how is $$\int_{a}^{b^-} f(x)dx$$ the infimum of all upper sums. I understand that if we refine the partition P, then the upper sum would decrease, so it may be a lower limit for all the upper sums computed on the refinements of P (but still being the lower limit does not prove that it is the infimum) and what about those partitions for which P itself is the refinement of?  How do I know that it will be a lower limit for those, let alone a infimum? Why can't "fi" be separated when being copied from a compiled pdf? Wild Magic Surge - What does "You cast ..." mean for your spell slots? In response to  question, I started to think about what it means when a Wild Magic Surge results in a "You cast spell-X".  So, "specific beats general" gives:   You can cast a second spell when you would not normally be allowed to You can cast a spell you don't know If the surge forces you to cast a concentration spell you would lose any concentration spell that you currently had active Subject to what the specific entry says you can target it how you like Unless the specific entry prohibits it you could use metamagic on the spell   I am pretty confident in all of the above but if anyone disagrees please address in an answer.  Here comes the question.  How does this impact on your available spell slots?  "You cast ..." to me suggests that if you have an applicable slot available then you have to use it to cast the spell because that is the general rule for casting spells but if you don't then "specific beats general" and it is cast anyway.  Specific examples:     You cast fireball as a 3rd-level spell centered on   yourself   This must be a 3rd level spell:   if you have a 3rd level slot available you have to use it? if you don't, if you have 5 sorcery points and a bonus action available must you use these to get that slot? if you don't have any of that then the spell goes off anyway?      You cast confusion centered on yourself.   No level specified and confusion is a 4th level spell:   if you have a 4th level slot available you have to use it? if you have a 4th, a 6th and an 8th level slot you can choose which one to use? if you have only a 5th level slot but also 6 sorcery points and a bonus action, you could choose to use the 5th level slot or use the points to create a 4th level slot? if you don't have any 4th level or higher slots but you have 6 sorcery points and a bonus action available must you use these to get that slot? if you don't have any of that then the spell goes off anyway?   And so on ... Add/Delete table rows dynamically using JavaScript Need advice on flavoring/sweetening my homebrew cider I've just finished my primary fermentation and have produced a cider that is coming in at 5.2%. I am about to bottle my cider and add some priming sugar to give it a bit of a fizz. I would like to try and flavor some of the ciders with a fruit coulis. am I correct in thinking that the natural sugar in the fruit should give the cider a natural fizz and I don't need to add any sugar? Also, I am a fan of a sweeter cider, I have been advise not to add more than a teaspoon of priming sugar, and to use a sugar substitute at the same stage if i wish to sweeten it. I have purchased Xylitol, I plan on trying a few combinations with the priming sugar/Xylitol &amp; no additive fruit coulis. Does this all sound like it makes sense or am I just going to ruin my cider. ssh into an account which has no home directory Difference between ' and " on command line (bash)? In a 'bulleted' list should items that happen to be complete sentences end with a period? How do I fix a "Problem with MergeList" or "status file could not be parsed" error when trying to do an update? The computer gave me this output in a window:  E: Encountered a section with no Package: header E: Problem with MergeList /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_natty_main_binary-i386_Packages E: The package lists or status file could not be parsed or opened.   How can I fix this?