A notorious open problem:
What is the non-perturbative…

https://www.physicsforums.com/insights/wp-content/uploads/2017/07/m-theory.png135240Urs Schreiberhttps://www.physicsforums.com/insights/wp-content/uploads/2016/08/PF_Insightsnew.pngUrs Schreiber2017-07-14 13:44:042017-09-12 21:20:41Super p-Brane Theory Emerging from Super Homotopy Theory