(2:45~3:15pm, Tea, Coffee, and Cookie)

I will review a simplified version of classification theory of topological insulators and
superconductors. The theory is based on topological classification of mass terms of Dirac
Hamiltonians. This approach can be used to classify topological insulators with a reflection
symmetry (topological crystalline insulators) as well. I will also discuss stability of surface
states against Anderson localization.