The Endomorphism reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Endomorphism

An endomorphism is a homomorphism from a mathematical object to itself. It is termed an automorphism if it is also an isomorphism.

     auto-

   /       \\

  /         \\

endo-      iso-  morphism

  \\         /

   \\       /

     homo-

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