Abstract
The region D is the plane minus one point. There is no sea, but there is an infinitely small lake P 0. (See Figure 6.1.) According to our rule, we are not allowed to move the curve across P 0. No matter how small, a lake is a lake, so we may not move our rubber railroad across P 0.
Figure 6.1.
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© 1993 Springer Science+Business Media New York
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Kuga, M. (1993). The Sixth Week: Examples of fundamental groups. In: Galois’ Dream: Group Theory and Differential Equations. Birkhäuser, Boston, MA. https://doi.org/10.1007/978-1-4612-0329-2_7
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DOI: https://doi.org/10.1007/978-1-4612-0329-2_7
Publisher Name: Birkhäuser, Boston, MA
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