[35] Demetrios Christodoulou, The Formation of Black Holes in General Relativity (Zurich: European Mathematical Society, 2009). [36] John D. S. Jones, “Mysteries of Four Dimensions,” Nature 332 (April 7, 1998): 488–489. [37] Simon Donaldson (Imperial College), interview with author, April 3, 2008. [38] Faye Flam, “Getting Comfortable in Four Dimensions,” Science 266 (December 9, 1994): 1640. [39] Ibid. [40] Mathematical Institute at the University of Oxford, “Chart the Realm of the 4th Dimension,” http://www2.maths.ox.ac.uk/~dusautoy/2soft/4D.htm. [41] Grisha Perelman, “The Entropy Formula for the Ricci Flow and Its Geometric Applications,” November 11, 2002, http://arxiv.org/abs/math/0211159vl. [42] Eugenio Calabi (University of Pennsylvania), interview with author, October 18, 2007. [43] Robert Greene, interview with author, April 17, 2008. [44] Robert Greene, interview with author, June 24, 2008. [45] Eugenio Calabi, interview with author, October 18, 2007. [46] Robert Greene (UCLA), interview with author, January 29, 2008. [47] Eugenio Calabi (University of Pennsylvania), interview with author, May 14, 2008. [48] Ibid. [49] Erwin Lutwak (Polytechnic Institute of NYU), interview with author, May 15, 2008. [50] Calabi, interview, May 14, 2008. [51] Eugenio Calabi, interview with author, June 16, 2008. [52] Ibid. [53] Eugenio Calabi, interview with author, October 18, 2007. [54] Cumrun Vafa (Harvard University), interview with author, January 19,2007. [55] John Schwarz (California Institute of Technology), interview with author, August 13, 2008. [56] Michael Green (University of Cambridge), e-mail letter to author, August 15, 2008. [57] John Schwarz, interview with author, August 13, 2008. [58] Andrew Strominger (Harvard University), interview with author, February 7, 2007. [59] Andrew Strominger, interview with author, November 1, 2007. [60] Raman Sundrum (Johns Hopkins University), interview with author, January 25,2007. [61] Andrew Strominger, interview with author, February 7, 2007. [62] Dennis Overbye, “One Cosmic Question, Too Many Answers,” New York Times , September 2, 2003. [63] Juan Maldacena (Princeton University), interview with author, September 9, 2007. [64] Dan Freed (University of Texas), interview with author, June 24, 2008. — 293 —
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