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Whereas rationalist philosophers such as Descartes held that the ultimate source of human knowledge is reason, empiricists such as John Locke argued that the source is experience (see Rationalism and empiricism). Rationalist accounts of knowledge also typically involved the claim that at least some kinds of ideas are “innate,” or present in the mind at (or even before) birth. For philosophers such as Descartes and Gottfried Wilhelm Leibniz (1646–1716), the hypothesis of innateness is required in order to explain how humans come to have ideas of certain kinds. Such ideas include not only mathematical concepts such as numbers, which appear ...(100 of 23160 words)