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Dimension
Dimensions not only concern directly observable matters.
Geometrie
In geometry the various dimensions arise by analogies.
Point zero-dimensional Line one-dimensional Plane two-dimensional Body three-dimensional
Numbers
A number can have multiple dimensions.
Real number one dimension Complex number two dimensions Quarternion four dimensions Octonion eight dimensions
Space
The dimension of a space is defined as the minimum number of coordinates needed to specify any point within it.
Spacetime
Spacetime describes the four dimensions of the universe in one model.
Fractals
A fractal is every set with a non-integer dimension.
Constants
The fine-structure constant is dimensionless and has the same value in all unit systems.