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An integer that is either 0 or positive, i.e., a member of the set Z^*={0} union Z^+, where Z-+ denotes the positive integers.

An integer that is either 0 or negative, i.e., a member of the set {0} union Z^-, where Z-- denotes the negative integers.

In the American system, 10^(60).

The number p in a fraction p/q, i.e., the dividend.

Sampling at the Nyquist frequency.

A mathematical structure (e.g., a group, vector space, or smooth manifold) in a category.

In the American system, 10^(27).

In the American system, 10^(57).

A mathematical object upon which an operator acts. For example, in the expression 1×2, the multiplication operator acts upon the operands 1 and 2.

An orbifold is the object obtained by identifying any two points of a map which are equivalent under some symmetry of the map's group.