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Notes from the 2001 - 2002 academic year: Magic Squares by Jim Carlson (October 31 and November 7, 2001) Catalan Numbers by Mladen Bestvina (November 28 and December 5, 2001) Euler Characteristics I by Thom Pietraho Euler Characteristics II by Thom Pietraho Inversion in the Plane I by Zvezda Stankova Inversion in the Plane II by Zvezda Stankova (Note: To open and print these .pdf files, Adobe Acrobat Reader software is required. Click here to download a free copy of this software.) Notes Main Page