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." 
In parallel to this, Socrates considers the individual or soul that corresponds to each of these regimes. He describes how an aristocrat may become weak or detached from political and material affluence, and how his son will respond to this by becoming overly ambitious. The timocrat in turn may be defeated by the courts or vested interests; his son responds by accumulating wealth in order to gain power in society and defend himself against the same predicament, thereby becoming an oligarch. The oligarch's son will grow up with wealth without having to practice thrift or stinginess, and will be tempted and overwhelmed by his desires, so that he becomes democratic, valuing freedom above all.