Peirce's cenopythagorean categories, Merleau-Ponty's chiasmatic entrelacs and Grothendieck's Résumé

We present Peirce's cenopythagorean categories and Merleau-Ponty's entrelacs and chiasma, as universal phenomenological tools, particularly useful for a better understanding of dynamic, non-classical, non-separated contemporary mathematics. As a case study, we revisit Grothendieck's Résumé, and we explore its extremely rich mathematical, semiotical and phenomenological entanglements.