Question: Who first proposed the physics theory, known to have been later independently proposed in a more complete paper by the current tenured professor at the University of Amsterdam, and director and Leon Levy professor at the Institute for Advanced Study in Princeton?
{'answer': 'Luboš Motl', 'supporting_facts': [['Matrix string theory', 0], ['Matrix string theory', 2], ['Robbert Dijkgraaf', 0], ['Robbert Dijkgraaf', 1]]}