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I have a maths degree and am fairly sure I have never even heard of Big-O sorting - is this a variant of Black-Scholes?
Big-O isn't related specifically to sorting - it refers to the standard notation for stating the order of an algorithm.
Apparently there are people out there claiming to be software developers who don't know what expressions like O(n) and O(n*log(n)) actually mean. These are the people who merrily implement algorithms of order n-squared-squared and then can't understand why it takes a millisecond on their useless little test database of ten random numbers, but needs until the heat death of the Universe on live data
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