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A pair of overdots placed over a symbol, as in x^.., most commonly used to denote a second derivative with respect to time, i.e., x^..=d^2x/dt^2.

A mathematical statement of the equivalence of two quantities. The equality "A is equal to B" is written A=B.

The head of a vector AB^-> is the endpoint B, i.e., the point at which the arrow is placed.

(1) Based on or involving trial and error. (2) Convincing without being rigorous.

A set of six.

Oriented in position perpendicular to up-down, and therefore parallel to a flat surface.

While an equality A=B states that two mathematical expressions are equal, an inequation A!=B states that two expressions are not equal.

A strong inequality in which a is not only less than b, but much less (by some convention) is denoted a<<b.

A quantity that is nonzero everywhere is said to be nonvanishing. For instance, the values of x^2+1 are nonvanishing for real x, while those of x^2 are not (since x^2 ...

The term "over" is commonly used in mathematical exposition as a synonym for "in the domain of." So, for example, "Let f be a function over the reals" means "Let f be a ...