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A coordinate system similar to toroidal coordinates but with fourth-degree instead of second-degree surfaces for constant mu so that the toroids of circular cross section are ...

The order ideal in Lambda, the ring of integral laurent polynomials, associated with an Alexander matrix for a knot K. Any generator of a principal Alexander ideal is called ...

The property intf(y)delta(x-y)dy=f(x) obeyed by the delta function delta(x).

A module over a ring that is contained in and has the same addition as another module over the same ring.

delta(x-t)=sum_(n=0)^inftyphi_n(x)phi_n(t), where delta(x) is the delta function.

Bracewell's term for the delta function.

Orthogonal contravariant and covariant satisfy g_(ik)g^(ij)=delta_k^j, where delta_j^k is the Kronecker delta.

A subring of a ring R is a subgroup of R that is closed under multiplication.

An associative ring, also called a Hecke ring, which has a technical definition in terms of commensurable subgroups.

A more common way to describe a Euclidean ring.