For full treatment, see macropaedia: Geometry: Topology. ... A broadening influence originated in Georg Cantora#39;s studies of number theory and set theory. ... men noted that for any polyhedron without holes, the number of vertices plus the number of faces minus the number of edges is 2. .... Toprakkale, also spelled topra kaleh, ancient Urartian fortress located near modern Van in southeastern Turkey.

Title | : | The New Encyclopaedia Britannica: Micropædia |

Author | : | Encyclopaedia Britannica, inc |

Publisher | : | - 1991 |

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