Flat
A set in R^d formed by translating an affine subspace or by the intersection of a set of hyperplanes.
See also
Associative, Faithfully Flat Module, Flat Manifold, Flat Module, Flat Norm, Hyperplane, Plane-Plane IntersectionExplore with Wolfram|Alpha
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Cite this as:
Weisstein, Eric W. "Flat." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Flat.html