While the sky was still overcast, the sun light coming into his office from a small window made it warm. Dr. Barrett talked about a retired professor, Chandler Davis, from the University of Toronto. For Chandler, retirement means proving theorems, supervising Ph. D students, teaching graduate and undergraduate courses, editing the 'Mathematical Inteligencer' and being very active in the American Mathematical Society. That is, retirement means doing exactly what he did before retirement, just not getting paid for it.
Some people can stop but it's usually because they taper off as they reach retirement.
Here are some other subjects that we talked about in a Question and Answer format. Q. I enjoyed Linear Algebra when I took it from you, and other students that I have talked to liked that class from you. A. I consolidated these ideas for a speech that I gave at the beginning of this academic year and a self-study document. Dr Barrett goes on to read parts of this document and interject comments for the length of this response. He can't consider teaching is something you do Monday through Friday between the hours of 8 and 5.