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An unknot which can only be unknotted by first increasing the number of crossings.

An element B of a ring is nilpotent if there exists a positive integer k for which B^k=0.

In the American system, 10^(30).

A quantity which is either 0 (zero) or positive, i.e., >=0.

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.