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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.

If two quantities A and B are approximately equal, this is written A approx B.

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

The biharmonic operator, also known as the bilaplacian, is the differential operator defined by del ^4=(del ^2)^2, where del ^2 is the Laplacian. In n-dimensional space, del ...

K=(dT)/(ds), where T is the tangent vector defined by T=((dx)/(ds))/(|(dx)/(ds)|).

One would think that by analogy with the matching-generating polynomial, independence polynomial, etc., a cycle polynomial whose coefficients are the numbers of cycles of ...

A dual bivector is defined by X^~_(ab)=1/2epsilon_(abcd)X^(cd), and a self-dual bivector by X_(ab)^*=X_(ab)+iX^~_(ab).

A type of flow technically defined in terms of the tangent bundle of a manifold.

The jerk j is defined as the time derivative of the vector acceleration a, j=(da)/(dt).

The Jordan product of quantities x and y is defined by x·y=1/2(xy+yx).