Search Results for ""

The principal normal indicatrix of a closed space curve with nonvanishing curvature bisects the area of the unit sphere if it is embedded.

Let three equal circles with centers J_A, J_B, and J_C intersect in a single point H and intersect pairwise in the points A, B, and C. Then the circumcircle O of the ...

Marion's theorem (Mathematics Teacher 1993, Maushard 1994, Morgan 1994) states that the area of the central hexagonal region determined by trisection of each side of a ...

The symmetry operation (x,y,z)->(x,y,-z), etc., which is equivalent to 2^_, where the bar denotes an improper rotation.

A surface given by the form z=F(x,y).

An algebraic surface of degree 9. Enneper's minimal surface is an example of a nonic surface.

An angle which is not a right angle or a multiple of a right angle.

A nonsingular linear map A:R^n->R^n is orientation-reversing if det(A)<0.

Two (or more) intersecting curves that are perpendicular at their intersection are said to be orthogonal.

Orthogonal contravariant and covariant satisfy g_(ik)g^(ij)=delta_k^j, where delta_j^k is the Kronecker delta.