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Hello, welcome to Techit's knowledge dump page. Here I will dump as many knowledge as possible for collection in the future use.

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== Mathematics ==

=== [[wikipedia:Set_(mathematics)|Set]] ===
Imagine a [[wikipedia:Array_(data_structure)|data array]], it's a set. Set is a collection of different stuff. For example A = {1,2,3,4,5,6,7,8,9} or <math>\text{Slave}=\{\text{Diskette},\text{GameCreator}\}</math>.

====== Elements / Members ======
A stuff in a data set is called "element" or "member", so to write a set notation we use <math>\in</math>(in) or <math>\not\in</math>(not in). Let's see some examples below.

<math>A=\{x|x\in I^{+}, -5<x\leq12 \}</math> or <math>B=\{x|x\in P, -5\leq x \leq 23\}</math>