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A knot diagram which does not specify whether crossings are under- or overcrossings.

S_n=sum_(i)eta_imu(E_i), where mu(E_i) is the measure of the set E_i of points on the x-axis for which f(x) approx eta_i.

An operator L^~ is said to be linear if, for every pair of functions f and g and scalar t, L^~(f+g)=L^~f+L^~g and L^~(tf)=tL^~f.

A set considered together with the sigma-algebra on the set.

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

Sampling at the Nyquist frequency.

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

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.

A signal sampled at a frequency higher than the Nyquist frequency is said to be oversampled beta times, where the oversampling ratio is defined as ...