:The conical depression is just a way to visualize the gravity well it doesn't mean that is actually how it occupies three dimensional space . ( No more than the Sun actually exists in a little depression talk ) 22 : 13, 24 November 2009 ( UTC)
22.
The first axiomatic treatment of finite projective geometry was developed by the projective " n "-space that he developed, he considered a finite three dimensional space with 15 points, 35 lines and 15 planes ( see diagram ), in which each line had only three points on it.
23.
In a manner analogous to the way lines in a two-dimensional space are described using a point-slope form for their equations, planes in a three dimensional space have a natural description using a point in the plane and a vector orthogonal to it ( the normal vector ) to indicate its " inclination ".
24.
My assumption is that if you can rotate a sphere in two dimensions about a one-dimensional axis in a three dimensional space and have its equator expand in a plane, by analogy you can rotate a sphere in three dimensions about a two dimensional plane in a 4d hyperspace and have its surface expand in three dimensions.
25.
During the last 30 years, some scholars have argued that Vermeer's images have a photographic immediacy because they are literally photographic, because they were painted with the assistance of a " camera obscura " _ an instrument that creates a two-dimensional projection of three dimensional space as light passes through a small hole in the wall of a darkened box.
26.
He defined the framed tube structure as " a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form a vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation . " Closely spaced interconnected exterior columns form the tube.
27.
The Bangladeshi engineer Fazlur Khan defined the framed tube structure as " a three dimensional space structure composed of three, four, or possibly more frames, braced frames, or shear walls, joined at or near their edges to form a vertical tube-like structural system capable of resisting lateral forces in any direction by cantilevering from the foundation . " Closely spaced interconnected exterior columns form the tube.
28.
There are a number of color distance formulae that attempt to use color spaces like HSV with the hue as a circle, placing the various colors within a three dimensional space of either a cylinder or cone, but most of these are just modifications of RGB without accounting for differences in human color perception they will tend to be on par with a simple Euclidean metric.
