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In general, a sieve separates wanted/desired elements from unwanted material using a tool such as a mesh, net or other filtration or distillation methods, but it is also used for classification of powders by particle size, or for size measurement as an analytical technique. The word "sift" derives from this term. A strainer is a type of sieve typically associated with separating liquids from solids. Chemistry Sieving coefficient, in transport phenomena Mathematics Sieve theory, a technique for counting or filtering sets of numbers Sieve of Eratosthenes General number field sieve Large sieve Sieve (category theory), a way of writing down how objects in a category glue to give other one
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