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The conjugate of a quaternion a=a_1+a_2i+a_3j+a_4k is defined by a^_=a_1-a_2i-a_3j-a_4k.

A parameterization of a surface x(u,v) in u and v is regular if the tangent vectors (partialx)/(partialu) and (partialx)/(partialv) are always linearly independent.

A repeating decimal, also called a recurring decimal, is a number whose decimal representation eventually becomes periodic (i.e., the same sequence of digits repeats ...

A surface possessing a saddle point.

The series of Sturm functions arising in application of the Sturm theorem.

The relationship x succeeds (or follows) y is written x≻y. The relation x succeeds or is equal to y is written x>=y.

One of the 14 4-polyaboloes.

A function defined for all possible input values.

Oriented in an up-down position.

A k-chain whose bounding (k-1)-chain vanishes.