How does Quine justify admitting numbers and classes, but not properties or propositions in his ontology?

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Karyth Cara | College Teacher | (Level 1) Senior Educator

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The justification is that Quine is an empiricist though not a nominalist. As such, he prefers to take into account transcendence "transcendent individuals." This is in opposition to "concrete individuals." Quine's essential ontology is "pure sets."