2. Special packages

2.1 Body

Definition (body). A subset X of a topological space $(E, T)$ is a body if its interior is non-empty.

Definition (boundary set). A boundary set is a subset whose complement is dense (p. 66 of

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(1) - AARTS (J.M.), NISHIURA (T.) - Dimension and Extensions, - North Holland, 331 pages (1993).
(2) - ADAMS (C.), FRANZOSA (R.) - Introduction to Topology Pure and Applied, - Pearson, 507 pages (2008).
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