Example image of eyePlorer eyePlorer map for 'Nominalism': Abstract object Metaphysics Philosophy Universal (metaphysics) Plato Problem of universals John Stuart Mill Theory of Forms Aristotle Sophistical Refutations Cat Kermit the Frog Shirt Abstraction Existence Part Philosophical realism Exemplification Metaphysical naturalism Augustine of Hippo Conceptualism Neoplatonism Plotinus Charles Sanders Peirce Instantiation Mind Moderate realism Daniel Dennett Ontology Willard Van Orman Quine Exemplar Natural kind Virtuous circle and vicious circle Objectivity (science) Primitive Physics Identity of indiscernibles George Berkeley John Locke Nelson Goodman Philosophy of mathematics Set theory Extensionality Richard Milton Martin Universe Foundations of mathematics Set (mathematics) Number Ordered pair Point