1. study of geometric properties: the study of the properties of geometric figures that are independent of size or shape and are not changed by stretching, bending, knotting, or twisting
2. family of subsets: the family of all open subsets of a mathematical set, including the set itself and the empty set, which is closed under set union and finite intersection
3. anatomy of body part: the anatomy of a part of the body
4. study linking topography and time: the study of changes in topography that occur over time and, especially, of how such changes taking place in an area affect the history of that area
5. relationships between linked elements: the relationships between parts linked together in a system such as a computer network
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formal
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