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The antilaplacian of u with respect to x is a function whose Laplacian with respect to x equals u. The antilaplacian is never unique.

The inverse function of the logarithm, defined such that log_b(antilog_bz)=z=antilog_b(log_bz). The antilogarithm in base b of z is therefore b^z.

A fractal process for which H<1/2, so r<0.

A quantity which changes sign when indices are reversed. For example, A_(ij)=a_i-a_j is antisymmetric since A_(ij)=-A_(ji).

The application of an apodization function.

A group in which any decreasing chain of distinct subgroups terminates after a finite number.

In logic, a statement which cannot be broken down into smaller statements, also simply called an "atom."

A base-60, or sexagesimal, number system, used by the ancient Babylonians.

The Diophantine equation x^2+k=y^3, which is also an elliptic curve. The general equation is still the focus of ongoing study.

An "area" which can be defined for every set--even those without a true geometric area--which is rigid and finitely additive.