Question: In differential geometry, a Nadirashvili surface is an immersed complete bounded minimal surface in R with negative curvature, Eugenio Calabi and Shing-Tung Yau had a question, about whether there was an immersed complete bounded minimal surface in R, Shing-Tung Yau is from Hong Kong and what type of American mathematician?
{'answer': 'naturalised', 'supporting_facts': [['Nadirashvili surface', 2], ['Shing-Tung Yau', 0]]}