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\textbf{Summary:}I \textbf{Summary:} I  tried to understand the basic reasons for QHE, and TI. I hope to understand the details of TI edge states through SSH model. I need to study more to make the connections from SSH model to topological insulator. And then I will try to expand the model from this 1D model to 2D model called "Qi-Wu-Zhang" model.