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* [http://jeff560.tripod.com/i.html Earliest Uses of Some of the Words of Mathematics: entry on Injection, Surjection and Bijection has the history of Injection and related terms.]
* [http://www.khanacademy.org/math/linear-algebra/v/surjective--onto--and-injective--one-to-one--functions Khan Academy – Surjective (onto) and Injective (one-to-one) functions: Introduction to surjective and injective functions]
{{Mathematical logic}}
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