At the University of Michigan, Kaczynski specialized in complex analysis , specifically geometric function theory . His intellect and drive impressed his professors. "He was an unusual person. He was not like the other graduate students. He was much more focused about his work. He had a drive to discover mathematical truth," said professor Peter Duren . "It is not enough to say he was smart," said George Piranian , another of his Michigan math professors.  During his time at Michigan, Kaczynski earned 5 B's and 12 A's in his 18 courses. However in 2006, he said his "memories of the University of Michigan are NOT pleasant ... the fact that I not only passed my courses (except one physics course) but got quite a few A's, shows how wretchedly low the standards were at Michigan." 
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