2003 2 24 Definition 1.1

Abstract

(x, y) ∈ (α β) de f ⇐⇒ (x, y) ∈ α ∨ (x, y) ∈ β, (object) (attribute) (attribute value) a ∈ A V(a) = {0, 1} context 1 A ∀a ∈ A. f (1 A , a) = 1 1 A context context with 1 

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