Topic: Topology (Undergraduate)

The Hilbert Cube and Its Product Metric

The Geometric-Series Proof of Tietze Extension

The Genus Two Surface Group

The Fundamental Group of the Projective Plane

The Fundamental Theorem of Algebra by Degree

The Fundamental Group Criterion for Lifting Maps

The Fundamental Group of an Interval

The Fixed-Point Theorem for Interval Maps

The Fundamental Group Action on a Fiber

The First Uncountable Ordinal and Cofinal Neighborhoods