## Archive for the ‘Geometry & Topology’ Category

### Whitney Sum Formula and Exponentiation

Posted by: **yanzhang** on March 16, 2012

### Why Hopf Algebras

Posted by: **yanzhang** on March 15, 2011

### Being Unthankful for Unenlightening Proofs

Posted by: **yanzhang** on November 26, 2010

### Symplectic geometry II

Posted by: **lewallen** on September 3, 2009

### Symplectic geometry I

Posted by: **lewallen** on September 2, 2009

### Trees, The BEST Theorem, and Alexander Polynomials

Posted by: **yanzhang** on August 20, 2009

### A Lie group which isn’t a matrix group

Posted by: **Steven Sam** on July 10, 2009

### Topological Tic Tac Toe 3: Hypergraph Games

Posted by: **Alexander Ellis** on May 8, 2008

### Shoulda Series 1: Choosing Bases

Posted by: **Alexander Ellis** on April 27, 2008

### Topological Tic Tac Toe 2: Other Surfaces

Posted by: **Alexander Ellis** on April 17, 2008