Symbol Overlap

Contextual Direct Relevance

• The contextual intersection Π_SetF(F_i,F_j), F_i,F_j∈SetF, is

                             |{f:f∈SetF,s∈sym(f)}|
  ∑                   ( 1 - --------------------- )
  s ∈ sym(Fi)∩sym(Fj)               |SetF| 

• The contextual direct relevance between F_i and F_j is

      Π_SetF(F_i,F_j)
  -------------------
  |sym(F_i) ∪ sym(F_j)|

Contextual Indirect Relevance

• The weakest link relevance of the chain F₀-F₁- ... -F_n is

  min    contextual-direct-relevance(Fi-1,Fi)
  i=1..n
  -------------------------------------------
                      n

• The contextual indirect relevance between F₀ and F_n is

  max weakest-link-relevance(F0,Fn)