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What is an existential type?

I read through the Wikipedia article Existential types . I gathered that they're called existential types because of the existential operator (∃). I'<em>mem> not sure what the point of it is, though. What's the difference between ...
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Environ<em>mem>ent variables for java installation

How to set the environ<em>mem>ent variables for Java in Windows (the classpath)? 14 Answers 1...
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Why are Docker container i<em>mem>ages so large?

I <em>mem>ade a si<em>mem>ple i<em>mem>age through Dockerfile fro<em>mem> Fedora (initially 320 <em>Mem>B). 8 Answers 8 ...
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How to know if other threads have finished?

I have an object with a <em>mem>ethod na<em>mem>ed StartDownload() , that starts three threads. 12 Answers ...
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node.js fs.readdir recursive directory search

Any ideas on an async directory search using fs.readdir? I realise that we could introduce recursion and call the read directory function with the next directory to read, but a<em>mem> a little worried about it not being async... ...
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How do I connect to a specific Wi-Fi network in Android progra<em>mem><em>mem>atically?

I want to design an app which shows a list of Wi-Fi networks available and connect to whichever network is selected by the user. ...
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How can I check if a URL exists via PHP?

... Here: $file = 'http://www.exa<em>mem>ple.co<em>mem>/so<em>mem>efile.jpg'; $file_headers = @get_headers($file); if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') { $exists = false; } else { $exists = true; } Fro<em>mem> here and right below the above post, ...
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How to shrink/purge ibdata1 file in <em>Mem>ySQL

I a<em>mem> using <em>Mem>ySQL in localhost as a "query tool" for perfor<em>mem>ing statistics in R, that is, everyti<em>mem>e I run a R script, I create a new database (A), create a new table (B), i<em>mem>port the data into B, sub<em>mem>it a query to get what I need, and then I drop B and drop A. ...
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Changing Locale within the app itself

<em>Mem>y users can change the Locale within the app (they <em>mem>ay want to keep their phone settings in English but read the content of <em>mem>y app in French, Dutch or any other language ...) ...
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This project references NuGet package(s) that are <em>mem>issing on this co<em>mem>puter

I have an ASP.NET <em>Mem>VC5 application that worked yesterday and now I a<em>mem> getting this error when I try to build: 18 Answers ...