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Abusing the algebra of algebraic data types - why does this work?
...oint strikingly. You mentioned in a comment that for a tree type T = 1 + T^2 you can derive the identity T^6 = 1, which is clearly wrong. However, T^7 = T does hold, and a bijection between trees and seven-tuples of trees can be constructed directly, cf. Andreas Blass's "Seven Trees in One".
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How to install MySQLdb (Python data access library to MySQL) on Mac OS X?
...t one of the most pernicious problems is that OS X comes installed with a 32 bit version of Python, but most average joes (myself included) probably jump to install the 64 bit version of MySQL. Bad move... remove the 64 bit version if you have installed it (instructions on this fiddly task are avai...
Finding sum of elements in Swift array
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let sum = multiples.reduce(0, +)
print("Sum of Array is : ", sum)
Swift 2:
let multiples = [...]
sum = multiples.reduce(0, combine: +)
Some more info:
This uses Array's reduce method (documentation here), which allows you to "reduce a collection of elements down to a single value by recursi...
ExecJS::RuntimeError on Windows trying to follow rubytutorial
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242
My friend was attempting a Rails tutorial on Win 8 RTM a few months ago and ran into this erro...
Compare two Byte Arrays? (Java)
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In your example, you have:
if (new BigInteger("1111000011110001", 2).toByteArray() == array)
When dealing with objects, == in java compares reference values. You're checking to see if the reference to the array returned by toByteArray() is the same as the reference held in array, which of...
How can I repeat a character in Bash?
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32 Answers
32
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Center a DIV horizontally and vertically [duplicate]
...it here working: http://jsbin.com/iquviq/30/edit
.content {
width: 200px;
height: 600px;
background-color: blue;
position: absolute; /*Can also be `fixed`*/
left: 0;
right: 0;
top: 0;
bottom: 0;
margin: auto;
/*Solves a ...
Generate MD5 hash string with T-SQL
Is there a way to generate MD5 Hash string of type varchar(32) without using fn_varbintohexstr
9 Answers
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How to remove multiple indexes from a list at the same time? [duplicate]
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240
You need to do this in a loop, there is no built-in operation to remove a number of indexes at...
How to diff a commit with its parent?
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answered Jan 12 '09 at 18:06
mipadimipadi
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