* A reprint of (part of) his famous 1847 article introducing Topology, published in "Vorstudien zur Topologie, Vandenhoeck und Ruprecht", Göttingen, pp.
==External links==* A reprint of (part of) his famous 1847 article introducing Topology, published in "Vorstudien zur Topologie, Vandenhoeck und Ruprecht", Göttingen, pp.