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A preset is a tuple consisting of a set [ilmath]X[/ilmath] and a preorder on [ilmath]X[/ilmath], [ilmath]\preceq[/ilmath][1], then we say that:

  • [ilmath](X,\preceq)[/ilmath] is a preset.

See also


  1. An Introduction to Category Theory - Harold Simmons - 1st September 2010 edition