Plato's definition of knowledge

This Venn diagram sample illustrates the Plato's definition of knowledge. It was redrawn from the Wikimedia Commons file: Belief Venn diagram.svg. [commons.wikimedia.org/wiki/File:Belief_Venn_diagram.svg] "Justified true belief is a definition of knowledge that is most frequently credited to Plato and his dialogues. The concept of justified true belief states that in order to know that a given proposition is true, one must not only believe the relevant true proposition, but one must also have justification for doing so. In more formal terms, a subject S knows that a proposition P is true if and only if: (1) P is true, (2) S believes that P is true, and (3) S is justified in believing that P is true" [Justified true belief. Wikipedia] The Venn diagram example "Plato's definition of knowledge" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Basic Venn Diagrams solution from the area "What is a Diagram" of ConceptDraw Solution Park.