Sir Michael Atiyah said of Witten,

“Although he is definitely a **physicist **(as his list of publications clearly shows) his command of mathematics is rivalled by few mathematicians, and his ability to interpret physical ideas in mathematical form is quite unique. Time and again he has surprised the mathematical community by his brilliant application of **physical insight **leading to new and **deep mathematical theorems**… he has made a profound impact on contemporary mathematics. In his hands physics is once again providing a rich source of inspiration and insight in mathematics. ”

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2007.10.13 Saturday CHK2