A Venn Diagram simplification of Plato's definition of knowledge. (More precisely, as Gettier himself puts it, Plato first mentions the tripartite definition of knowledge as justified true belief in Theatetus 201, and appears to support it in Meno 98.)

The Venn Diagram restricts the domain of knowledge to propositions. This is a restricted, philosophical sense of knowledge (see Epistemology).

It recognises that belief and truth is not sufficient for knowledge; that knowledge is a subset of true beliefs. The philosophical problems related to knowledge traditionally revolve around how to understand what differentiates between true beliefs and knowledge.

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