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A tensor having contravariant and covariant indices.

Spherical triangles into which a sphere is divided by the planes of symmetry of a uniform polyhedron.

(b-c)/a = (sin[1/2(B-C)])/(cos(1/2A)) (1) (c-a)/b = (sin[1/2(C-A)])/(cos(1/2B)) (2) (a-b)/c = (sin[1/2(A-B)])/(cos(1/2C)). (3)

A curve also known as swan-like curve or streamline. It is given by the polar equation r=atheta+b, where a>0.

An extremely powerful theorem in physics which states that each symmetry of a system leads to a physically conserved quantity. Symmetry under translation corresponds to ...

Any irreducible curve may be carried by a factorable Cremona transformation into one with none but ordinary singular points.

"Nordstrand's weird surface" is an attractive quartic surface given by the implicit equation It has 11 ordinary double points located at (2/5,0,0), (-2/5,0,0), ...

g_(ij)=[0 1 0 0; 1 0 0 0; 0 0 0 -1; 0 0 -1 0]. It can be expressed as g_(ab)=l_an_b+l_bn_a-m_am^__b-m_bm^__a.

An angle greater than pi/2 radians (90 degrees) and less than pi radians (180 degrees).

An octic curve is an algebraic curve of order eight. The pear curve is an example of an octic curve.