delta system

If S is a set of finite setsMathworldPlanetmath then it is a Δ-system if there is some (possibly empty) X such that for any a,bS, if ab then ab=X.

Title delta system
Canonical name DeltaSystem
Date of creation 2013-03-22 12:54:57
Last modified on 2013-03-22 12:54:57
Owner Henry (455)
Last modified by Henry (455)
Numerical id 5
Author Henry (455)
Entry type Definition
Classification msc 03E99
Related topic DeltaSystemLemma