View source for Lecture content:Topology and Geometry 2

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[[Lecture:Topology and Geometry 2|Lecture 2]]
# Solving problem by deformation
# Understanding by turning it to a higher dimension
# Introduction to Basic Building Blocks of Topology and Geometry
## n-ball <math>B^n</math> 
## (n-1)-sphere <math>S^n , n-1</math> (Don't know why I can't write the )
## what is the different between circle and disk