1 “... at the University of Rochester during Fall Term 1969/70. They would not have been written without the encouragement...”

2 “..., laying aside components which fall into the diagonal and intersecting the residual scheme with the next...”

3 Table of Contents: “... Solutions -- Activities for §3 -- 4. Applications of First-Order ODEs -- Falling, Floating, or Accelerating...”

4 “... on groups serve in deriving algebraic results about ultrafilters. The contents of the book fall naturally...”

5 “... until everything falls into place in the proof of Markov’s theorem. What makes the Markov theme so...”