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In mathematical analysis, a domain or region is a non-empty, connected, and open set in a topological space. In particular, it is any non-empty connected open subset of the real coordinate space R n or the complex coordinate space C n .
A closed feasible region of a linear programming problem with three variables is a convex polyhedron. In mathematical optimization and computer science , a feasible region, feasible set, or solution space is the set of all possible points (sets of values of the choice variables) of an optimization problem that satisfy the problem's constraints ...
In mathematics, an annulus (pl.: annuli or annuluses) is the region between two concentric circles. Informally, it is shaped like a ring or a hardware washer. The word "annulus" is borrowed from the Latin word anulus or annulus meaning 'little ring'. The adjectival form is annular (as in annular eclipse).
In mathematics, the support of a real-valued function is the subset of the function domain of elements that are not mapped to zero. If the domain of f {\displaystyle f} is a topological space , then the support of f {\displaystyle f} is instead defined as the smallest closed set containing all points not mapped to zero.
Annulus (mathematics), the region between two concentric circles; Ball (mathematics), the usual term for the 3-dimensional analogue of a disk; Disk algebra, a space of functions on a disk; Circular segment; Orthocentroidal disk, containing certain centers of a triangle
This definition is immediately generalizable to any real, or complex, vector space. Intuitively, if one thinks of S {\displaystyle S} as a region surrounded by a wall, S {\displaystyle S} is a star domain if one can find a vantage point s 0 {\displaystyle s_{0}} in S {\displaystyle S} from which any point s {\displaystyle s} in S {\displaystyle ...
3. Between two groups, may mean that the first one is a proper subgroup of the second one. > (greater-than sign) 1. Strict inequality between two numbers; means and is read as "greater than". 2. Commonly used for denoting any strict order. 3. Between two groups, may mean that the second one is a proper subgroup of the first one. ≤ 1.
In geometry, a slab is a region between two parallel lines in the Euclidean plane, [1] or between two parallel planes in three-dimensional Euclidean space or between two hyperplanes in higher dimensions.