Math 360: Introduction to Modern Geometry
Spring 2026
Instructor: Prof. Cleary
E-mail: scleary (at sign) ccny.cuny.edu
Office: Marshak 301C
Phone: 650-5122
Office Hours: see webpage here for up-to-date office hours.
Text: Stahl, The Poincare Half-Plane, Jones and Bartlett Publishing. Second edition!
Course documents:
Announcements:
- The plan is to meet in NAC 1/511E, the room to the right as you enter the Artino Lab.
- There are two straightforward quizzes on Blackboard which should be completed by Feb 3rd at 9am.
- Students enrolled in the course should have gotten a Welcome email on Jan 21st. If you are enrolled but did not get an email, make sure your CUNY First and Brightspace emails are set up properly.
- First class meets Jan 27th.
- E. Abbott Abbott's Flatland is available online in many places, for example here or at Project Gutenberg.
- Euclid's Elements are available online in many places, for example here.
- Hilbert's Axioms are available online in many places, for example here.
- Note that there are different editions of Stahl's book. You want the second edition, which has a greenish cover with yellow and has ISBN 978-0763753818, not the one with the blue cover which has an ISBN which ends in 202984.
- There is a webpage with errata for the book here
- The Stahl book is unfortunately on the expensive side- there is a copy of the text on library reserve. The first edition is available for much less expense but there are a few changes, including how exercises are grouped and the exercises themselves have been changed somewhat.
There are used copies available at ABE and elsewhere.
Homework Assignments
Other Links