Projection (set theory)
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- A set-theoretic operation typified by the jth projection map, written , that takes an element of the Cartesian product to the value .
- A function that sends an element x to its equivalence class under a specified equivalence relation E. The result of the mapping is written as [x] when E is understood, or written as [x]E when it is necessary to make E explicit.
See also 
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