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The lesser and greater sublists are then recursively sorted. This yields average time complexity of O(n log n), with low overhead, and thus this is a popular algorithm. Efficient implementations of quicksort (with in-place partitioning) are typically unstable sorts and somewhat complex, but are among the fastest sorting algorithms in practice.
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v. t. e. Decision tree learning is a supervised learning approach used in statistics, data mining and machine learning. In this formalism, a classification or regression decision tree is used as a predictive model to draw conclusions about a set of observations. Tree models where the target variable can take a discrete set of values are called ...
Polylogarithmic function. In mathematics, a polylogarithmic function in n is a polynomial in the logarithm of n, [1] The notation logkn is often used as a shorthand for (log n)k, analogous to sin2θ for (sin θ)2. In computer science, polylogarithmic functions occur as the order of time for some data structure operations.
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So for example if n is 5, the index cannot be 15 even though this divides 5!, because there is no subgroup of order 15 in S 5. In the case of n = 2 this gives the rather obvious result that a subgroup H of index 2 is a normal subgroup, because the normal subgroup of H must have index 2 in G and therefore be identical to H.
Coelacanths (/ ˈ s iː l ə k æ n θ / ⓘ SEE-lə-kanth) (order Coelacanthiformes) are an ancient group of lobe-finned fish (Sarcopterygii) in the class Actinistia. [2] [3] As sarcopterygians, they are more closely related to lungfish and tetrapods (which includes amphibians, reptiles, birds and mammals) than to ray-finned fish.
[4] [5] [6] It is a variation of fishing and refers to the use of lures to "fish" for sensitive information. [ 5 ] [ 7 ] [ 8 ] Measures to prevent or reduce the impact of phishing attacks include legislation , user education, public awareness, and technical security measures. [ 9 ]