Two elements, x and y, are related by the reflexive transitive closure, R+, of a relation, R, if they are related by the transitive closure, R*, or they are the same element.

In addition suitable contents:
[ am ] [ an ] [ ar ] [ at ] [ b ] [ by ] [ cl ] [ closure ] [ ed ] [ element ] [ h ] [ io ] [ it ] [ la ] [ ns ] [ re ] [ reflexive ] [ relation ] [ sa ] [ sam ] [ si ] [ sit ] [ su ] [ T ] [ th ] [ tr ] [ transitive ] [ transitive closure ] [ ve ]