According to the classic JTB theory, the belief, truth, and justification conditions are necessary and sufficient for the presence of knowledge.

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According to the classic Justified True Belief (JTB) theory of knowledge, for someone to know a proposition, three conditions must be met: the proposition must be true, the person must believe the proposition, and the person's belief in the proposition must be justified. These conditions are considered both necessary and sufficient for knowledge.

According to the Classic JTB Theory, the Belief, Truth, and Justification