Algebraic Topology 3: Fundamental Group is a Group!

Playlist: https://www.youtube.com/playlist?list=PLOROtRhtegr7DmeMyFxfKxsljAVsAn_X4 We recall the definition of the fundamental group develop in the previous lecture then prove that it is indeed a group. Finally, we show that the fundamental group of the circle is isomorphic to Z, the integers. Presented by Anthony Bosman, PhD. Learn more about math at Andrews University: https://www.andrews.edu/cas/math/ In this course we are following Hatcher, Algebraic Topology: https://pi.math.cornell.edu/~hatcher/AT/AT.pdf