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A branch of mathematics studying those properties of a geometric figure or solid that are not changed by stretching, bending and similar homeomorphisms.
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A collection τ of subsets of a set X such that the empty set and X are both members of τ, and τ is closed under finitary intersections and arbitrary unions.
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The anatomical structure of part of the body.
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The arrangement of nodes in a communications network.
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The properties of a particular technological embodiment that are not affected by differences in the physical layout or form of its application.
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(topography) The topographical study of geographic locations or given places in relation to their history.
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The art of, or method for, assisting the memory by associating the thing or subject to be remembered with some place.