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Residue is a concept in incidence systems that generalizes the concept of sections on abstract polytopes.

Definition[edit | edit source]

The residue of a flag, F , in an incidence geometry, , is an incidence system where

  • is the set of elements of Γ , not in F , that are incident on every element of F .
  • is the set of types of , . It is equivalent to .
  • is *  restricted to the domain of .
  • is t  restricted to the domain of .

An incidence structure is residually connected if every residue of rank 2 or greater has a connected incidence graph.

Bibliography[edit | edit source]

  • Fernandes, Maria (2014). "Regular and chiral hypertopes" (PDF).