UREM-ULB :
Unité de Recherche sur l’Enseignement des Mathématiques

A Fight to Fix Geometry’s Foundations

When two mathematicians raised pointed questions about a classic proof that no one really understood, they ignited a years-long debate about how much could be trusted in a new kind of geometry.

 Dusa McDuff, a prominent symplectic geometer at Barnard College and author of a pair of canonical textbooks in the field, and
 Katrin Wehrheim, a mathematician now at the University of California, Berkeley

Source : https://www.quantamagazine.org/20170209-the-fight-to-fix-symplectic-geometry/