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Topological Dimension Theory
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Flashcards
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Dimension Raising
Adding a point which does not lie on the space can increase its Lebesgue covering dimension by one.
Alexandroff's Theorem
Every compact metric space is of finite topological dimension.
Inductive Dimension
Defined recursively using the separation properties of the boundary of a small open set around a point.
Metric Dimension
A minimal set of points in a metric space such that all other points can be uniquely determined by their distances to the points in this set.
Fractal Dimension
A ratio providing a statistical index of complexity comparing how the detail in a pattern changes with the scale at which it is measured.
Hausdorff Dimension
Defined using the concept of measure at different scales, describing a fractal's 'roughness' or 'fragmentation'.
Menger-Urysohn Dimension
Equivalent to the small inductive dimension and defined using the concept of local separation on a topological space.
Sierpinski Triangle
A fractal with Hausdorff dimension that is a non-integer, which is typically greater than its topological dimension.
Brouwer's Fixed Point Theorem
In any closed and bounded subset of Euclidean space in dimension , any continuous function mapping the set into itself must have a fixed point.
Cantor Set
An example of a set with topological dimension zero but an uncountably infinite number of points.
Topological Dimension
The number of local coordinates necessary to specify points near any point in the space.
Lebesgue Covering Dimension
The minimum value of n such that any open cover has a refinement where no point is included in more than n+1 sets.
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