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A
solid body totally encloses a volume. It is not possible to
visit both sides of any face without first passing through a face. Every boundary of every face is used twice, except in the cases of the analytic sphere and torus, which are closed and require no further topology to bound a volume. A solid body has no dangling faces or dangling edges. A single-sided face is a solid body, not a sheet body.
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If a solid body, such as a cube, is missing a face, the body is said to be
unbounded (infinitely long) in that direction.
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See also body, and
sheet body.
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