The Jordan Curve TheoremExplores the Jordan Curve Theorem, illustrating the division of a plane by a simple closed curve into two regions.
Fundamental GroupsExplores fundamental groups, homotopy classes, and coverings in connected manifolds.
Zig Zag LemmaCovers the Zig Zag Lemma and the long exact sequence of relative homology.
Initial Problem SolutionsCovers the description of all solutions of the initial problem and related concepts such as compactness and closure.