It turns out that he didn't write De modis significandi by Thomas of Erfurt, but he did introduce the concept of a non-qualitative property responsible for individuation, a haecceity.
One work once attributed to this philosopher pairs the title concepts with modi intelligendi and modi essendi, or modes of understanding and modes of being, positing a triadic relationship between word, concept, and being. Because of this misattribution, C.S. Peirce attributes the project of grammatica speculativa or "pure grammar" to this philosopher, and Heidegger's habilitation dissertation is mistakenly titled after this philosopher's theory of categories and meaning. It turns out that he didn't write De modis significandi by Thomas of Erfurt, but he did introduce the concept of a non-qualitative property responsible for individuation, a haecceity. He argued against the notion that certainty depends upon an uncreated exemplar, the divine illumination of Henry of Ghent, and he wrote commentaries on Porphyry's Isagoge and Aristotle's Categories. For 10 points, identify this scholastic philosopher who wrote the Ordinatio and who was nicknamed Doctor Subtilis.
One work once attributed to this philosopher pairs the title concepts with modi intelligendi and modi essendi, or modes of understanding and modes of being, positing a triadic relationship between word, concept, and being.
John Duns Scotus