Geometry

In abstract algebra, the symmetry group of an object (image, signal, etc.) is the group of all transformations under which the object is invariant with composition as the group operation.

In physics and mathematics, a sequence of n numbers can be understood as a location in n-dimensional space.

Space is the boundless three-dimensional extent in which objects and events have relative position and direction.

In physics and mathematics, two-dimensional space or bi-dimensional space is a geometric model of the planar projection of the physical universe.

Wittgenstein's rod is a geometry problem discussed by 20th century philosopher Ludwig Wittgenstein.

Distance is a numerical description of how far apart objects are.

A schema for horizontal dials is a set of instructions used to construct horizontal sundials using compass and straightedge construction techniques, which were widely used in Europe from the late fifteen century to the late nineteen century.

In mathematics, noncommutative projective geometry is a noncommutative analog of projective geometry in the setting of noncommutative algebraic geometry.

The Oswald Veblen Prize in Geometry is an award granted by the American Mathematical Society for notable research in geometry or topology.

A Lénárt sphere is a teaching and educational research model for spherical geometry.

In several geometries, a triangle has three vertices and three sides, where three angles of a triangle are formed at each vertex by a pair of adjacent sides.