Class SYMMETRIC-RELATION


Slots on this class:

Documentation:
Relation R is symmetric if R(x,y) implies R(y,x).
Subclass-Of: Binary-relation

Axioms:

(<=> (Symmetric-Relation ?R)
     (And (Binary-Relation ?R)
          (=> (Holds ?R ?X ?Y) (Holds ?R ?Y ?X))))