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View search results from all Wolfram sites (507 matches)The surface corresponding to the region of obscuration when a solid is illuminated from a point light source (located at the radiant point). A disk is the shadow of a sphere ...
A knot diagram which does not specify whether crossings are under- or overcrossings.
The area of the shadow of a body on a plane, also called the "outer quermass."
A three-dimensional shadow of a four-dimensional Klein bottle.
A three-dimensional shadow of a four-dimensional Klein bottle.
The gnomon was an L-shaped movable sundial used for astronomical studies. It operated by resting on one leg so that the other pointed vertically upward. By measuring the ...
An n-dimensional disk (sometimes spelled "disc") of radius r is the collection of points of distance <=r (closed disk) or <r (open disk) from a fixed point in Euclidean ...
A projection of a figure by parallel rays. In such a projection, tangencies are preserved. Parallel lines project to parallel lines. The ratio of lengths of parallel segments ...
The exploration of three-dimensional space from two-dimensional sections of projections of solid bodies.
Roman (1984, p. 2) describes umbral calculus as the study of the class of Sheffer sequences. Umbral calculus provides a formalism for the systematic derivation and ...
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