# Topologische Gruppen, Teil 2 by L. Pontrjagin

By L. Pontrjagin

By L. Pontrjagin

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Extra resources for Topologische Gruppen, Teil 2

Example text

Vertices (2π−the sum of the angles at the corners of those faces that meet at the vertex). = Vertices (the sum of the angles at the corners of those faces that meet at the vertex). = 2πV − Vertices = 2πV − the sum of the interior angles of the face. Faces (nf − 2)π. Faces Here nf denotes the number of edges on the face f . = 2πV − nf π + T = 2πV − Faces 2π. Each face Thus T = 2πV − ( the number of edges on the face · π) + 2πF.

A decagon? 4. Show that the connected sum of two projective planes is a Klein bottle. 5. Cut the globe along the equator and join the southern hemisphere to the northern by strips with a half twist. Is the result orientable? What is its boundary? What is its topological type? 6. Consider the great dodecahedron with self-intersections removed. Is it orientable? What is its topological type? 22 Mirrors Problems 1. How do you hold two mirrors so as to get an integral number of images of yourself? Discuss the handedness of the images.

What do you get gluing opposite sides of a regular hexagon via translation? What about an octagon? a decagon? 4. Show that the connected sum of two projective planes is a Klein bottle. 5. Cut the globe along the equator and join the southern hemisphere to the northern by strips with a half twist. Is the result orientable? What is its boundary? What is its topological type? 6. Consider the great dodecahedron with self-intersections removed. Is it orientable? What is its topological type? 22 Mirrors Problems 1.