A Mathematical Symphony

…I hope that in addition there will be some readers who will simply take pleasure in a mathematical journey toward a high level of sophistication. There are many who would enjoy this trip, just as there are many who might enjoy listening to a symphony with a clear melodic line.

Robert B. Ash, mathematician
in A Primer of Abstract Mathematics (The Mathematical Association of America, 1998)

A Primer of Abstract Mathematics by Robert B. Ash