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The four planes determined by the four altitudes of a tetrahedron and the orthocenters of the corresponding faces pass through the Monge point of the tetrahedron.

The result of a matrix multiplication.

A real, nondegenerate n×n symmetric matrix A, and its corresponding symmetric bilinear form Q(v,w)=v^(T)Aw, has signature (p,q) if there is a nondegenerate matrix C such that ...

Two real algebraic manifolds are equivalent iff they are analytically homeomorphic (Nash 1952).

The British word for "zero." It is often used to indicate 0 subscripts, so a_0 would be spoken as "a naught."

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

The term "nonisomorphic" means "not having the same form" and is used in many branches of mathematics to identify mathematical objects which are structurally distinct. ...

A quantity which is either 0 (zero) or negative, i.e., <=0.

In every residue class modulo p, there is exactly one integer polynomial with coefficients >=0 and <=p-1. This polynomial is called the normal polynomial modulo p in the ...

An expression that is of a given type. For example, all primes p>3 are "of the form" 6n+/-1. The term "of shape" is sometimes also used.